exhaust knocking on startup. If the ticking sound appears to be lower down on the engine, it's likely the flange gasket connecting the manifold to the down pipe, or catalytic converter. Check your pcv recirc hose for oil. When on the throttle it sometimes sounds like a diesel. It's important to note that during normal driving this mapping is ignored. A classic case of a tappety, rattling engine. Could be a heat shield or an exhaust component but if it goes away after a few seconds, I would not rack my brain trying to find it You will . Let vehicle cool over night and boise was still present. Oil level and pressure are fine. mercedessource Tech help - Diesel Purge can help you isolate the noise Internal engine noises can be very difficult to diagnose. This morning the engine seemed to have a bad knock and ran kind of rough at the first start up. Seems to come from the exhaust rather than engine area. When warm, the valve must touch the head to cool itself, so some light tapping is necessary. What Are the Causes of Loud Noise When the Engine Starts?. hood protector, ash tray kit, '06 LED tails, T&H Euro bar, OME lift, Spidertrax. 0 engine is about 15 miles per gallon. 5 Reasons Your Engine Knocks on Startup Then Goes Away. I would definately say its the tappets, and nothing to worry about right now, though they will get worse over time, if I'm right as they get older they do this . When first started the engine puts out a lot of oil smoke. After it would drop to 0psi the lifter chatter/tap/knock (whatever you want to call it) would finally start up. Engine oil level was fine and really didn't know what else to check. If you can't do this then listen to where the noise is coming from. Too advanced ignition timing will cause the engine to start knocking or pinging. P0014 definition: Exhaust Camshaft Timing- Over-Advanced Bank 1. 2012 Chevy Impala has a rattling noise. The rattle noise still exists on start up and goes away after the rpm's settle down on my truck. It usually happens when it’s cold, and when it’s not been driven for a few days. I think it has something to do with the intake manifold. What is Engine Knocking and How Can I Fix It?. exhaust rattling phenomenon cured. Knocking noise and exhaust emissions light comes on - car won't start [Corsa C] [00-06] Jump to Latest Follow 1 - 1 of 1 Posts. We offer industry-leading electric exhaust cutouts. Buy your exhaust cutout online!. My wife also noticed a good puff of smoke come out of the tailpipe. The roaring you hear is the excess engine noise that usually gets silenced by the exhaust muffler and now that it has gone bad, the noise is . When using the hydraulics the power is really bad, so working the bucket and moving at the same time is an issue. GM said it was the Y pipe causing the noise. The 1st to break is usually the passenger side far back by the fire wall. It depends how loud it is mate. 0, auto, 148,000 miles, np242 The Jeep started making this loud clattering, knocking noise a couple weeks ago. White smoke or water vapor coming from the tailpipe, especially in the morning when the engine is cold. my 2005 nissan murano with 70,000 miles on it has been knocking and pinging during acceleration. If you've got rod knock the sound will change with engine RPM and will not change with engine temperature or load. If the exhaust billows white smoke for a few seconds when first starting the engine after it has been sitting for a while, such as overnight, and then runs normally, it could mean that the rubber valve stem seals have perished - especially if the vehicle is a few years old and has done over 60/70,000 miles. I swear mine sounded more like a knock then a tick. Ford Ranger Ticking Noise during Acceleration. Push down on the rocker end at the SHLA to test for a soft or spongy feel. Over time, due to wear, negligence, or abuse, that clearance may grow, leading to rod knock. The engine needs to manage you speeding up quickly and after that knocking on your brakes in case of traffic congestion. A piston slap will generally sound as though it is coming from the central area of the engine. In this paper, the effect of EGR on knock intensity was investigated under various conditions which included different compression ratios (9:1, 10:1, 11:1), IPs (1. The molecules present in this high-pressure wave collide with the molecules in the low-pressure exhaust pipe. Why Car Engine Knock on Startup then Goes Away?. Yeah, when the car is cold, I hear a knocking noise when I take off from a stop. If the noise lasts for more than a minute and completely disappears or dimishes after. Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. The other one is under the car behind the catalytic converter Knock Sensor on the RAV4. The specific heat value of the compressed charge would reduce with a rise in the EGR rate, due to which the temperature of the compressed charge increases, ultimately increasing the. I'm guessing that it is an exhaust manifold leak. Lately with the cold weather here in Chicago it is even more noticeable and as engine warms it gets quieter but not completely gone away. With a stock oil pump it has over 50 psi at start up (idling), and until it reaches operating. If you hear knocking or ticking from either cylinder head, go to the Repair Procedure. First I'm deleted with race me ultra and was running the 007a flash 120hp mild spool 29 max on timing. I also have a 2018 WRX, 6 speed, mine does not make the knocking noise. I seen other forums with a lot of people with same problem but no one seems to have a fix for it. If you don't follow proper maintenance procedure, the blue smoke from exhaust problem is most likely to occur. All diesels do it until the engine warms up. 2014 Charger Pursuit The Pork Wagon (2019 - 2021). Doesn't do it if it hasn't sat after being run. Since then, I have purchased a 1999 F-150 with 189k miles and the start-up knock already there. It's audible at idle but becomes very loud with revs and load. This sounds like typical timing chain tension noise. A diesel engine can ping, cling, clang and bang, and all the time you are wondering just what is acceptable and what is not. is a manufacturer of farm and home machinery, including lawnmowers and lawn tractors. The knocking: A piston was rubbing. The turbo on these trucks is a fairly complicated unit. The engines will be started one a time. Found excessive carbon, performed two cans of top engine clean. to deprive of a valuable quality or constituent. 8L (2ZR-FE) (2008) > Scion Workshop Manuals > Engine, Cooling and Exhaust > Engine > Timing Components > Camshaft Gear/Sprocket > Component Information > Technical Service Bulletins > Customer Interest: > SB0046-09 > Sep > 09 > Engine - Brief Rattle/Knock On Cold Start Up. Injectors could be noisy also and look for smoke from the muffler. Start from the top and work your way down. The increased mass of the exhaust gas entering the cylinder would decrease the combustion temperature inside the cylinder, thus reducing the intensity of knocking. The car is pretty new with 3,000 miles on it. The past week I have noticed my truck leaving a black stain in the driveway right where the exhaust ends. If you believe the noise is being caused by the exhaust ststem, then the only way to verify that is to inspect the exhaust system. At best, it could be exhaust manifold leakage. Symptoms of Exhaust Manifold Leak: Knock or clanging sound that comes from the engine. The exhaust system is comprised of a CDI (control unit) which monitors and actuates the sensors and valves in the exhaust system; a DEF pump. You probably need a new muffler. Sometimes it's good to mount a GoPro, or any other action camera, near where you suspect the noise is coming from to narrow it down a bit or even identify what the source of the noise is. The engine block and the cylinder head are full of channels where the coolant is flowing to cool the engine down. Well, the oil consumption is within spec (according to Porsche anyways). Attached is a web site that you can listen to a piston slap which is a known issue for your 4. My Tl make a loud knocking sound when I first start it up in the morning or after being parked for at least 6 hours. a) For electric water heaters: turn off the water heater at the circuit breaker. I had it on the ramp at quick fit and they showed me what it was as apparantly its a common fault. 0L vortec, it could be actual engine knock. As the gas is propelled towards the end of the pipe, the sound waves travel a lot faster towards the tailpipe. I don't want to say knocking but it was loud. Diagnostic Procedure: Start the engine and let it reach normal ­operating temperature. Fuel is sent to the engine and ignited. Your engine is built with a designed clearance between the crankshaft journals and the connecting rods. We think given Subaru's explanation, Johnznot having had a dealer start three random new Outbacks on the lot, and our experience with this type of sound, it is fair to say "They all do that. Bored scoped engine cylinder‘s 1,3,5,and 7. Knocking (also knock, detonation, spark knock, pinging or pinking) in spark ignition internal combustion engines occurs when combustion of some of the air/fuel mixture in the cylinder does not result from propagation of the flame front ignited by the spark plug, but one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front. The main cause of smoke from the exhaust when accelerating is a burning coolant or transmission fluid problem. A year later, after the warranty was out, the thing started to get worse. A small gap in the manifold seal, a loose header collar or a small hole opening up in rusty pipes. Valve seals are leaking oil via the valve guides into the the cylinders. I remember reading a post about a member having white smoke come from the exhaust but cannot find it. I have a rattle sound on start up, worst when cold, but will do it again if the vehicle has sat for 1/2 hour or more. Today I did some rewiring and started it up but now has a loud knocking sound,pulled the V/C's and found no bent P/R's and the lifters do seem to be pumping. I've probed around with a stethoscope and hose trying to find the source. A damaged EGR valve can hang open and cause excess flow on startup. Kohler 22HP knocking noise. In addition to making a racket and smelling bad, the leaking exhaust could also cover the engine bay in a thick layer of dirty soot. EGR (Exhaust Gas Recirculation) components and the intake manifold EGR passages are likely very carbon-clogged. During winter or on cold days it's normal to see vapour coming out of the exhaust pipe. engine knock/rattle on startup, 07H3. sounds like a broken exhaust bracketwhich is fairly common on our cars. Engine knock or pinging is knocking in spark-ignition internal combustion engines occurs when combustion of the air/fuel mixture in the cylinder does not start off correctly in response to. A fuel additive won't fix the sound made by valve . probably the exhaust sound was bouncing around the torn inner layer of the tube, eyc. I simply used double sided 3M tape and attached a plastic washer at the bottom of the flapper. get under the car or put it on a lift if you have access to one. Spray some WD-40 on the tensioner, and the noise will go away. Now i hear it from the exhaust manifold only, not near the valve cover. For the first circa 5mins it sounds like a noisy set of rollers (not squeel) but an occerlation sound. If you suspect that your car is making a loud noise due to a muffler problem, take a look at your exhaust system. Obviously ticking is going to be the major symptom of a lifter tick. Now I'm not sure if this is just me being. My dealer said it was a normal truck sound. make sure the exhaust have cooled off, get hold of the exhaust and shake it back and forth and up and down and look for bumping sounds. When it drops back to tickover it seems fine but after ticking over for a little it seems to come back. Now it opens when it's turned on and makes ZERO flapping noise when it's not. Don't use high mileage oil it designed for vehicles that leak oil so its thicker you drive a tundra 160,000 mile you are still braking in the engine. This post relates to a loud knocking sound that is only occasional. What Causes Engine Knock (8 Causes) and How to Fix Engine. Once knock starts, you need to pull out more timing than would originally be needed for knock to ever occur. A low oil level can cause engine ticking noises as valvetrain components aren't getting the proper lubrication and start to get. An octane rating is the measure of a fuel type's ability to resist premature detonation of the air-fuel mixture in the engine. Help!! It sounds like the top of the engine near the back but not sure. Top 5 Reasons Your Car is Making a Knocking Sound 1) Imbalanced Air-to-Fuel Mixture 2) Octane Rating is Low 3) Incompatible Spark Plugs 4) Carbon Deposits 5) Cylinders Not Lubricated Enough How to Fix Engine Knocking (Especially at Idle) Can You Drive a Car With a Knocking Engine? What is Engine Knock?. After spraying WD-40 on the tensioner for about two weeks, the noise finally went away. Remove the spark plug and check it. After 8 years, I'm willing to bet that at least on of them is loose . This can prevent further buildup on the various parts in your vehicle’s engine that effect timing. the cars just had over 1000 worth of damage to engine n I'm getting sick of this constant. Has anyone else run into similar problems? The best hint I've found is a faulty exhaust flap. Then everything is fine as usual. That is usually a broken manifold bolt. Knocking or banging sound under the vehicle. Maybe once for every 20 starts. Strangely I've just found this thread which seems to be describing something similar, but it is about much newer. This process will create that blue smoke coming out of the exhaust. We use cookies to give you the best possible experience on our website. Application of exhaust gas recirculation of NOx reduction. Hello, I have recently noticed a “knock” on Start Up of my 2014 Cooper S. Is there a way to read 02 millivolts? With the scanmaster you're able to see what the 02 sensor is doing and able to narrow it down. Once the blades on the first engine to be started are spinning sufficiently, it will be started. If I rev the engine (gently of course) - sounds normal but if I engage a gear and pull away for a few metres - it. The exhaust system includes the muffler, resonator, catalytic converter, and header/down pipe. Step 2 - Listen to exhaust manifold. If it is not properly mounted, the engine will knock as it. I see you haven't been back on the forum for a while. It sounds like a loud diesel engine firing up. The noise will be a rhythmic pop pop that keeps following the engine. Agh it happened to me this morning. If the engine is running too hot, because of low coolant, a cooling fan that isn’t working; a clogged radiator, bad water pump, sticking thermostat, etc. Discussion Starter · #1 · May 10, 2013. This happens when the engine (4 cyl Ecotec) is cold, or after it has sat a. If a knocking noise, piston or crankshaft related problem. 7 Powerstroke engines suffered from was turbo failure. Black exhaust smoke means that your engine is burning fuel too quickly, if this occurs check your air filter, fuel injectors and the fuel pressure regulator. the knock sensor, 60,000 service, coils & plugs and clutch have all been done in the last year - two oil changesin 2010 - march and december. Put in some heavier weight oil and get rid of the car before it cost you an engine rebuild. Sean; I bought a 2009 charger from my nephew. Finally finished up my build and installed the Terminator X for LS1/LS6 on my freshly rebuilt LQ9. Exhaust gas is very low in oxygen. It has happened in both cold and warm conditions. But none have stated what it specifically is, & the huge cost for. I have a 2013 Impala that had the loud exhaust noise on start up. Thin white smoke on startup then disappears is usually a result of condensation build-up within the exhaust system. It's possible that your blue exhaust smoke is caused by simply having too much or too little oil. Good day all, I have a intermittint but consistently occurring engine noise. A fire could start if the raw fuel comes in contact with the hot exhaust system or rotating engine components. Not much at all you can do about that expect experiment with different types of oil and oil filters. The exhaust coming out of the resulting holes often makes a rhythmic ticking noise. Nov 12, 2001 2,895 0 0 35 Winston-Salem, NC members. I have an 03' F-650 w/ 3126B Cat engine. - The octane rating of gasoline is sometimes known as the AKI -- anti-knock index. That's even true with pickups, and large trucks. But with the deadline for the implementation of final Tier 4 emission standards knocking on the door, we're seeing that it's about more than simply having the right piece of equipment on hand. Don't know how it got that way, could be the steel cap on the top of the exhaust valve, when it fell into the bottom of the OHV well stuck in the intake. If that's the only rust on the vehicle, well worth it. Cracked Cylinder Head or Block. They replaced it and it helped some for that RPM range. Rod bearings may be worn enough to cause the brief knock until your oil pressure builds up. 2008 Scion xD 80,000 mi, Visitor. I have had the rmm tsb done and I seem to notice it more since it has been a lot colder this year compared to last year. How to diagnose and stop smoke from the exhaust. 5L EcoBoost - Cold Start Ticking/Tapping Or Rattle Type Noise - Built On Or Before 31-Oct-2019 20-2315 14 September 2020 This bulletin supersedes 20-2191. Once the car is idle and increases the RPM it makes a louder sound. You can hear it when letting out on the clutch when. My guess is a heat shield rattle near manifold or exhaust system - those rattles are fairly common on all vehicles during start-up until the engine smooths out after start-up - also a rough running engine will produce these shield rattles. If the bathroom exhaust fan making a knocking noise is over ten years old, you might need. Problem I am having is a knocking/ticking sound at cold start up, only lasts about 10-15 seconds or when I put it in drive if it doesn’t go away on its own now the problem is is that it has only happened about 4 times in a 3 month time frame the truck is driven daily. They told me it was a bad injector. The 2005 Ford F-150 has 62 problems reported for loud ticking/knocking noise from motor. When it's cold the clearances are greater, when the engine warms up they decrease and the noise goes away. 4L) A quick update: I replaced the exhaust tubes and the low-level noise seems to have gone. The exhaust on a Harley is properly tuned from the factory to function coherently with the engine. We have checked the exhaust and that seems. To start things off, the fuel economy of the F-150 fitted with the 5. Rattle noise only on startup and idle. Let's start with the best-case scenario. O2 in the exhaust is normal to an extent, in fact most manufacturers INJECT fresh O2 into the exhaust manifold to "cheat" emissions rating, making the engine appear to burn cleaner. Topic 10-18-01TT - Rattle Noise on Start Up, with Camshaft Timing Faults Market area United States 444 Volkswagen of America, Inc. Re: 2002 Q45 loud knocking noise on startup (xerexabante) 1. In some instances, backpressure may buildup to such a degree that it blow out a pipe connector or the converter shell. The exhaust manifold is made of cast steel and the cylinder head is cast aluminum. A valve opens and circulates exhaust gas into the intake manifold to cool the combustion process. White smoke coming out of the exhaust pipe might result due to so countless reasons however when you see white smoke from the exhaust at startup, just know that your car is probably are having one of the following issues below: A bad, warped or cracked cylinder head. Snapper Jack said: Kohler has had trouble with their V-twins smoking on start up for years,along with breaking rods,oil consumption, plug fouling (lowest cylinder to the sump) but despite these inherited problems,they are a very robust engine internally built for longevity which is why I'm rebuilding a 20Hp command. Replacing an exhaust is usually pretty simple at an exhaust shop. btw, here is a picture to illustrate: The stabiliser (anti roll) bar is the horizontal black bar in the picture. mike dm said: Took the armada in at about 8,000 miles with what i thought was a valve train engine knock, dealer said this is normal during initial start. Common causes are: carbon buildup in the combustion chambers or on cylinder walls, lifters or connecting rods, . Is the wastegate adjustable? If so lower as low as. In instances like this, the muffler or . SYMPTOM SUMMARY The engine emits a tapping noise on start up. a diesel exhaust fluid (DEF) is introduced into the exhaust stream. It takes a trained ear with a stethoscope to diagnose this problem with any accuracy. Mine has been rattling on start up for a couple of months, but I'm fairly certain that it's something to do with the exhaust system. A new fuel odor or drop in MPG that seems to be coming from the exhaust pipe. I have already replaced the timing. Sinister, it could that something is broke! If the exhaust is SST at start up the pipes are cold and loose and they will expand quite a bit in a . Knocking pipes can be a cause for real concern. Exhaust-gas-recycle (EGR) Exhaust-gas-recycle (EGR) is one system that helps to control pre-ignition and reduce emissions. Knocking in Engine Definition Knocking is a phenomenon in an internal combustion engine that is a sharp sound that is caused due to the premature Detonation or combustion of some compressed air-fuel mixture in the combustion. My Freelander starts first time and runs well until it gets up to temperature after about ten minutes (its winter time in New Zealand). 1) Exhaust valve rocker arm had 3/8in gap, due to it's mounting stud coming loose and backing out 3/8". It happens on short journey cars mainly due to condensation between the inner and outer parts causing the connecting spots to erode possibly, or just the original spot welds were infact done badly, or the pulses within the headers destroys the welds and causes them to fail;, who knows ?. It doesn't do it when cranking, it's only when the car first starts up (more noticeable on cold start-up). Aside from the noise the engine seems to be running fine with no loss of power or smoke etc. Brief Knocking or Rattle on Cold Start Up : Scion xD Engine. What cannot get out blocks what needs to get in. Blueish white smoke coming from the exhaust usually means that you need to take a look at the oil. If you hear a distinct knocking or ticking sound for extended periods of time I suggest you get the valves adjusted, if that doesn't solve the problem then the cam chain tensioner is shot, it and the cam chain will need to be replaced. A knocking sound that occurs continuously while the furnace is running is a signal repairs are needed. The exhaust system carries the exhaust gases from the front of the car to the rear. In a properly running engine using a good oil, the motor oil fills those clearances and prevents metal-to-metal contact. The riser, which is shaped like an inverted "U," is sometimes located at. After the car has been stood up overnight in the cold. If there's too much oil it gets into the combustion. I had been getting a knocking sound from under car and just left of clutch(i'm right hand drive). Depends on if its a tapping or a rattle, these do suffer from worn/noisey timing chains on start up. Some vehicles equipped with a 4. Supply pressure of oil is too low. Its normal for it to knock first cold start of the day 45 F or colder and let it worm up before you go maybe till the temp gauge start to rise above the first line. Since around 198,000 miles I've had an ominous knock/tap from the engine. Is this due to the fact that there may not be enough oil collected back inside the heads yet? Will this go away. It will very from some rattle to noticeable rattling. Loss of power and/or acceleration, especially when starting from a stop or slowing down. 6 duramax I've put about 3000 miles on it and noticed a knock noise it sounds just like a main bearing knocking so I brought in to let the dealership look at it and there telling me that the knocking sound is coming from the return. Maybe you added or changed the oil and slopped some, or overfilled. 4 Knocking on Cold Start Up - My 2003 F-150 knocks pretty bad on my early morning cold start ups. I have no idea as to what it could be, At first, I thought it was the exhaust vibrating or rattling against something but I don't think . I can not find out where the sound is coming exactly and why the engine makes a Rattle noise or it seems to be a Knock Knock sound ( Hammer ) on the cold start ( Around 34F - 36F ). If the sound is coming from the valve cover area, then it may . I only hear it after longs periods of not driving (over two days). This goes beyond normal diesel clatter the knock is very heavy and pronounced. Cleaning is best done by 100K, at the latest. The bushing is that black rubbery connector inside the metal housing in the middle of the picture. PA Hayseed, I have similar loud knocks for about 30 seconds after startup, outside temps are about 65F. Hello to all my GM people! Can you please give me some insight into why my 2018 Chevy sounds like the back end is always grinding/knocking and just flat out making a ton a noise you would not expect to be there from such a new truck. However, if the detonation is not fixed, it will damage the engine. The exhaust pipes can make all the contact they want now, the sound frequencies emanating from such contact isn't picked up by the knock sensors and interpreted as knock anymore. It must go up and down with the F150's engine speed, or it is not a lifter tick at all. 6 Pentastar Handle (Power Upgrades). Sometimes it occurs due to a faulty anti-drainback valve in the oil filter, allowing oil to bleed . Knocking sound from the top end. Diagnosis: This trouble code severely impacts the drivability of your vehicle. All V-8 engines, for instance, have a separate exhaust manifold along the side of each cylinder bank. Set engine speed to over 1,200 RPM. A DEF tank, a DEF temp sensor, a DEF level sensor and. Here is a picture of the rear rubber mount that's on it's way out. When started first thing on a morning, 9 times out of 10 it sounds like the exhaust has a hole in it. The noise may be accompanied by DTC P0300, P0302 or P0305 on the active fuel management system (AFM) cylinders. I just bought a 2020 Gmc 2500 Denali with the 6. DimaRider said: That looks like oil is sitting in the cylinder after shut down. An engine mechanical fault can cause that also. This Is Why Cold Starts Are So Damn Loud. The sound goes away if you give it just a slight amount of throttle, you can. Average repair cost is $3,500 at 76,350 miles. b) For gas water heaters: Turn the gas valve knob to pilot. If it goes away as soon as oil pressure builds up, it's nothing to worry about. It will not go away as the engine gets warmer. Repair Urgency: Fix this code immediately (same-day if possible) to avoid damage to multiple internal engine components. The knock sensor is a small "listening" device in or on the engine that detects abnormal vibrations and sounds coming from the engine block. If the vehicle exhibits the pop noise from the exhaust, replace the front muffler assembly (CV6Z-5230-Q) and 2 exhaust clamps (CV6Z-5A231-D). 1996 - 2004 SN95 Mustang -General/Talk-SN95 4. I would also add that I used to also run 1/2 bottle of Diesel Kleen every tank, but think that may have been contributing to some intermittent smoking I was experiencing. 4) Lucas Heavy Duty Oil Stabilizer. If your car sounds louder than usual or you hear an unusually loud roaring noise when you start the engine, the problem could be with the exhaust system. I dumped a couple of quarts of Delo 15w-40 in and drove on. the reason for loud cold start is because your car is trying to warm up the catalytic converters as fast as possible. So, if your engine is making that annoying knocking, pinging or rattling sound; then you’re probably experiencing engine spark knock. The engine knocks when cold because of excess clearance. The noise may also be described as ticks, taps, knocks or thumps. Bring engine oil temperature to 160º F or above as indicated by the scan tool EOT PID. Sounds like something with the exhaust and its only on cold start up not when the car is already warmed up. This type of smoke on start is caused by worn valve stem seals and loose valve guides, if the noise is lifter noise ( sounds like it may be) replace the cam followers, that should cure the issue, on the other hand a tapping noise is not bad, an actual knock is very bad, and means either. Because detonation interrupts that design, it robs the engine of power. A motor that is knocking when it is hot can be for various reasons, . Discussion Starter · #1 · Mar 27, 2021. To start with, a car's ECU decides that the engine has to idle higher when the engine is cold to stop it from stalling. exhaust: [verb] to consume entirely : use up. One is the tick on startup that lasts for a few seconds until the oil is pumped back up top. There is a loud exhaust noise which may be coming from either the front or rear of the vehicle. You may have a cracked flexplate (flywheel). , it may cause the fuel to detonate. In some cases the noise may be a normal characteristic of these engines. We’ll explain both of these problems, what causes them and how to stop the banging noises. After it idled for a few minutes, it cleared up and ran fine. Apparently shields are installed (top & bottom halves) over the existing catalytic converter shields and Voila!. If something is failingthen yes. You can also carefully smell the water or smoke from the exhaust; if it smells sweet, it's most likely coolant, and in this case, you have a bigger problem. In the short term, a bottle of carbon-cleaning additive can help scour the system and expedite the resolution of causes 2, 3 and 5. This could be caused by valve seals, valve guides, piston rings, worn cylinder walls, or the PCV system. I have tried to piece as much info I can about the issue and I have this: the noise sounds like a light "knock" coming from the. 1 is in a difficult location, it is mounted below the intake manifold, below cylinder 3. Engine spark knock, is usually heard, during moderate to heavy engine acceleration. Knock went away when they turned off 6. Let's start with the core introduction of the knocking process to act as a stepping stone to get all the information. It most often happens when the Prius C has been shut off for some time – or when it has been shut off for a while, moved a short distance and restarted some time later. Using a fuel additive like top-tier gasoline brands will provide more detergents that help keep your engine clean. A knocking or ticking noise from your engine is a sign that something is wrong. SOLVED: Loud exhaust noise on startup. There could be a few reasons why you are getting a diesel engine knock-on startup. its a fuel issue, said during start more fuel is delivered. Just a thought, do aftermarket exhausts rattle on startup in the same way?. Sounds like exhaust valve rattle. Maybe 3 times since I noticed the first a week or two ago. RockAuto ships auto parts and body parts from over 300 manufacturers to customers' doors worldwide, all at warehouse prices. If your EGR valve is stuck in a closed position, the temperature inside the combustion chamber will be too high. When we go from place to place it doesn't do it on startup then. If you have a car from the 1970s or earlier, a lingering fuel odor after you turn off the engine might be normal; if that odor is strong, however, don't wait to get it checked out. Well this is what it turned out to be my problem. According to the service bulletin, a knocking or popping noise may be heard from the front of these vehicles when the steering wheel was turned to the full locked position - this could occur when the vehicle was being driven or when it was stationary. The appearance of blue smoke is commonly seen during morning time when you start the engine for the first time on a day. Really the only way oil can get in the cylinders is through the piston rings through either leaving it on cylinder walls or blowby. Sounds like an oil pressure issue. Outfitted with a 23-gallon tank you're getting 430 miles on a tank of gas, which isn't too bad at all. She has purred like a kitten for the past 23k miles since I got her. The chain itself can also stretch just so over time. After running for about 5 or 6 minutes it returned. 0L Vortec Engine Problems. Order a new exhaust cutout from JEGS High Performance. The truck has 203k miles now and runs great (albeit still with the knock at startup). Engine is very quiet after this initial rattle. Place the transmission in park or neutral 2. Seems to originate from the rear of the car on the exhaust side, and stops when the car gets warmed up. Your pipes start producing a loud, noisy knocking. Castrol GTX start-up oil is supposed to cling to the rotating assembly during start up to help eliminate this. The bathroom exhaust fan makes a knocking noise because of broken fan blades, poor installation, a faulty motor, or bad lubrication. A contribution test will show this though. #1 Hoping somebody can help me please. The knock sensor detects engine block vibration and sound, converts it to an electronic signal, and delivers it to the engine management unit (ECU). Engine is bone dry, no cracks on exhaust, dogbone mount appears intact. An engine rattling noise, or a clicking sound in an engine, can spring up from a number of sources. If you search You Tube, for "2012 Honda CRV, Cold start noise" you will hear exactly what noise I'm referring to. Listen close to the passenger manifold on a cold start and you’ll hear it if that’s the case. Upon startup it Rattles/knocks loudly for about 30 seconds to a minute, it will do it on cold or hot startups. 4 and at a cold start or anytime I let the truck sit for a couple hours it has a really bad squeaking noise. this makes me think the knocking sound has something to do with the exhaust pipe. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. When this occurs, the engine will stumble and run rough, sounding as if it is misfiring. I bought this thing brand new and I have heard some rumors that. What happens is, the long exhaust manifold starts to warp due to heat cycles and pulls on the manifold suds and eventually breaks them off. Could be a little bit of timing chain noise. Then I went to start it up Monday morning. I was wondering if I should be concerned. 2) Turn the cold-water supply lever to a 90-degree angle. It is coming from the bottom of the engine or transmission. A local shop told me it was the tensioner. First, there could be a problem with the bearing on the pulley. If the emissions return to normal after a minute of the vehicle warming up, breathe a sigh of relief: You have just been introduced to the smoke vs.