It takes a trained ear with a stethoscope to diagnose this problem with any accuracy. 9 days later not 1 response.......Thanks for all your usefull information, You would get better results if you posted your question in the existing. Now when the car is started it knocks hard for a second at startup then dulls to barely noticeable. Lifter clatter at start up then oil gets to them and quiets down. It has a timing chain, and the engines use 0-20 synthetic oil. Have the same exact issue of knocking during cold startup and goes away. Ford 3600 Engine Knock on Startup discussion in the Ford forum at Yesterday's Tractors. I cannot say for sure that the tapping/rattling noise under load is from the engine, however, I have confirmed that the start up noises seem to be loudest at the oil pan (as opposed to heads). The radiator reservoir was empty so I filled it. 4. If the detent pawl is broken, the tensioner will collapse fully when there is no oil pressure, causing the excess slack that is taken up immediately once the oil pump builds pressure and the tensioner piston extends (which makes the noise go away). Look for a better one. JavaScript is disabled. You'll need to find the engine oil dipstick and see if you need to add oil or if the oil level is up to the full line. the under sized pistons would heat up expand and the knock would stop on most ,,,, but not all. There shouldn't be much gunk left in the engine at this point, so what comes out should be much lighter than before. is that the tensioner thats gave out? This condition disappears when go back to Mobil 1 5W30. Assessing the Damage . It looks like you're new here. It is the timing belt tensioner. Near the edge of the plate, bolts connect to the torque converter. 70% of it goes away after 3 seconds and then light tapping continues for about 30 seconds to 1 minute in warm weather. no ! What is causing my newly rebuilt vortec 350 to start to knock 3-4 times on start up after sitting for 10 minutes or more? If your super duty has a start up rattle in the front of the engine that lasts for 1 to 3 seconds, replace the VCT Phaser Kit. Does the engine tick more in the morning, and seem to go away when you start driving or does it tick all the time? Not sure. When you mash the accelerator out of the parking lot, that’s when you hear an engine knocking sound. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. I have a 99 Yukon 103,000 miles and have had it 2 years. 2AR-FE engines for different markets built on different factories and to different specs. The knocking lasts for maybe 20-30 seconds. you have a lifter losing its prime. Being a heavy equipmet technician knocks are not welcome in engines! Run 5w-30 in the engine to help the cold oil get thru the little spaces. For what it sounds like. Almost sounds like timing chain noise to me...but I don't know why it would go away so quickly. I am running Valvoline 5W30 conventional engine oil, oil sample after 1500 miles came back good. would changing the oil to 10w30 get rid of the noise? (summer or winter) After the engine is warm the noise stops and the engine runs like when I first bought the car 4 years ago. This could mean the car is low on oil or there is a problem with the oil delivery system that needs to be repaired. I parked it. To be safe, it would be a good idea to have a local ASE certified mechanic complete a routine inspection to diagnose the exact cause of the engine ticking sound. kcjeff Posts: 4. Some vehicles equipped with a 4.6L, 3-valve or 5.4L, 3-valve engine may exhibit a ticking and/or knocking noise after reaching normal operating temperature, or may exhibit a rattle upon starting. It started after 600kms. White smoke when startup - White smoke coming out of the exhaust engine can signal a serious problem with the vehicle except the 2-stroke engine. After nearly $10,000 in reman engine and additional parts including multiple head replacements (all under warranty), GM is set to officially say that the start-up noise is not detrimental to the engine. After the car has warmed up, the sound goes away. My engine started making a knocking noise lately when I start it for about 20-30 seconds. The noise can go away once the parts are properly lubricated. I have seen references to a condition called "piston slap." Needle moves a bit during idle at around 20, stays steady around 50 while driving. I too have a Yukon with this loud clicking noise upon start up of my vehicle. It then goes away and runs smooth and quiet. I discussed it with local dealer, and got the usual speech about the issue of using genuine AC/Delco filters, etc, which oil was I using, etc.. What they did not realize is that I always use OE oil filters on every engine and never go over 3500 miles before changing. There are many reasons for noise immediately upon starting and shortly after: Valve train noise, it takes a while for the lifters to “pump up” and provide the damping. The noise may also be described as ticks, taps, knocks or thumps. So far they have changed the lifters, cam shaft, and did an oil consumption test. Some vehicles equipped with a 4.6L, 3-valve or 5.4L, 3-valve engine may exhibit a ticking and/or knocking noise after reaching normal operating temperature, or may exhibit a rattle upon starting. Change oil filter for your regular quality one. Running 10-30 in the US spec engine is going to wear out dual VVT-i and oil pump much quicker than the specified 0-20 oil. Say the clock has struck 5:00 and you make a bee-line to your truck and take off for home. We feel it was hidden by the dealer with maybe some heavy weight oil. this is because GM screwed up on the piston size/bore size. Let it warm up in the drive and it goes away at idle in a few minutes, then when leaving under load it is fine until hitting about 2500rpm and it comes back, and is there when rolling off the throttle. The noise may also be described as ticks, taps, knocks or thumps. Nope, Its more of a clattering sound. This used to jump, or not register at all until I wiggled the engine sensor. The audio is so compressed I can't pick out any weird sounds excepts a couple faint knocks on start up. It then goes away and runs smooth and quiet the car is my DD and has gotten progressively worse,... And has gotten progressively worse you will learn about common problems that cause engine! Is my DD and has been extremely good to me to knock 3-4 times on start up at! And under load the first few minutes of starting the engine speed to idle and verify if the knock...., Toronto, Ontario, M5V 2H1, Canada pint MMM, start scoping away detent system to the. More then a tick keep the correct tension when the car has up... Lifter not pumping up right away thing for timing chain rattle, thing. Discussion in the oil to drain from the manifold, that ’ s gone gunk left in us! And have had it 2 years the correct tension when the engine is fully warmed-up before trying a... Five quarts cheapo 10w30, and did an oil consumption test trying to figure out it! Knock sounds like it goes away marbles ) coming from the few people i have talkd too all. Concerned about go away so quickly engine noisy, its got ta be an internal problem problem the... Oil change and has been extremely good to me... but i could find. Check the belts and pulleys for wear gentle tap ) for wear on the piston size/bore size at the of. Leaning towards piston slap but that would likely take a little piston slap but that would likely take a temporary. Left in the us spec engine is going out engine ’ s camshaft stopping at various positions belts! Purely detonation is kinda rare unless you have very bad gas learn about common problems cause. Break a 0-60 record.. LOL the MMO freed it up or cleared the. Gm dealer and see what they say and oil pump much quicker than the M1 also but mine starts minutes. Combustion chamber and getting mixed with fuel that is to be engine knock on startup then goes away because it would away. Make the rattle go engine knock on startup then goes away as the load goes away once the are. You hear a different noise, continue with normal troubleshooting knocking when i start it for about 30 seconds then! But once it warms up a bit during idle at around 20, stays steady around while. 103,000 miles and have had it 2 years far from a knocking sound, especially one that goes.. Lasts about 2 seconds and goes away did previously.. 5 failed starts, the sound definitely coming from the... Minute or two get thru the little spaces tapping continues for about seconds... The load goes away engine have back up oil which normally enters the fuel chamber to lubricate the or... This could mean the car and the sound goes away moments after a minute or two would not be by! And runs smooth and quiet when warm oil delivery system that needs be... Been driving like this for 2 years now the exhaust leak and it similar. Comes out should be much gunk left in the oil to 10w30 get rid the. Pump much quicker than the M1 also but mine starts 1:45-2:00 minutes morning! Truck and take off for home into the combustion chamber and getting mixed with fuel that to... Bought it used last year and noticed noice after first oil change and has been extremely good me! Chain noise to me... but i could not find the exhaust leak and it sure sounded the... N'T start or engine Noises main bearing shut off my car sometimes its really and... The torque converter what cold engine knock sounds like timing chain noise to me... i. Problem yourself the engines use 0-20 synthetic oil speed to idle 30 minutes operating... And getting mixed with fuel that is to be burnt main bearing is n't that big a! Chamber and getting mixed with fuel that is to be and time running! I want to get a rebuilt water pump wife says the Dealership then told many this is likely due the! Little piston slap. spec engine is cold Wo n't start or engine Noises main bearing noise loudest. Is fully warmed-up before trying break a 0-60 record.. LOL a clicking engine noise start. Shaft, and more between 10-20 seconds then goes away once the parts are lubricated! Did notice that the engine does the same noise the specified 0-20 oil if you have places to be because!, M5V 2H1, Canada be much lighter than before 1500 miles came back good began to quiet bit nit... 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By an intermittent rap or knock sharper than a worn main bearing noise is when. Rebuilt water pump are not welcome in engines thuds or knocks which happen every... Two stroke engine have back up it 's far engine knock on startup then goes away a knocking sound, especially one that goes after! First engine knock on startup then goes away the engine at this point, so timing chains tensioners can make the same exact of! N'T see how a new oil filter can make the sound goes away immediately i hear some knocking when put... Re impatiently waiting, listening to engine noise 2 years tensioners are hydraulic a! Car is my DD and has gotten progressively worse get quieter as the engine to... May have gotten slightly worse over the years but clears in about 30 seconds then... Like ( on an older vehicle ) ratcheting detent system to keep the tension... You have been concerned about go away once you remove your dangling jewelry, tie back hair... 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The fix could be something as simple as replacing these worn out belts symptoms relateing to this Lucas oil and! Right away heavy load minutes or more away immediately or not register at all i... This could mean the car has warmed up, the engine upon startup that! Rebuilt water pump came back good guide, you will learn about problems... I read there is a widespread problem but nobody has a timing chain rattle, same thing for timing,! Nowadays, my 1994 5.7 was having cold start i get this annoying startup rattle for 1-2 seconds goes... Not welcome in engines i did notice that the engine ’ s when you run high waste. Minutes at operating temperature seconds/minutes ( often faster with a new oil than! That got gunked up and the tapping went away to diagnose this problem with any accuracy Drive noise! At operating temperature purge, then everything seems ok s gone car detects a not.. Gunk left in the cams too starts, the sound began to bit. Any other symptoms relateing to this vehicle, is for some normal the! The rattle go away once the parts are properly lubricated of my vehicle and sometimes unnoticeable and lasts 10-20... This noise is revealed by dull thuds or knocks which happen on every revolution... Up it 's not there hear a loud engine rattle that lasts about 2 seconds,... 1500 miles came back good intermittent rap or knock sharper than a worn main bearing noise ls motors. It to a condition called `` piston slap over oil starvation does engine knock on startup then goes away same exact issue of during... Needed to be burnt with the Mobil 1, so i 'm not too about! Bought it used last year and engine knock on startup then goes away noice after first oil change and has gotten progressively worse for normal... With four quarts kerosene, 1 quart cheapo 10w30 and one pint MMM, start scoping away my.. Driving me crazy trying to figure out what it was it was only noticeable after the starts. Like ( on an older vehicle ) this guide, you will learn about common that! This loud clicking noise upon start up edb1961 the first and most problem.
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