Question about 2001 Chevrolet Silverado 1500

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Hyd. lifters knocks at start up and than goes away. 5.3 engine

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Hi!!
Add a bottle of Lifter Quiet additive to the motor oil. That will take care of it.
Don't forget to rate this post!!

Posted on Aug 20, 2010

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2001 azteck 49000 miles use very little once every


The 3.4L engine has special pistons that are designed to expand as the engine heats up. When the engine is cold, the pistons make a knocking sound that resembles lifter noise or piston slap. As long as the noise goes away after the engine warms up, don't sweat it; this is normal.

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Sounds like a diesel on a cold day


could be a knock sensor or rockers knocking until oil warms up and oil pressure seals the lifters

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Why does my engine knock when i start it up


is it a knock or tap if its a tapping noise then goes away straight away its a week hydrolic cam lifter if its a heavy engin knock either lack of oil or big end bearing expensive if its this

Aug 14, 2012 | 2008 Chevrolet Malibu

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A knocking that starts when engine is cranked then it goes away


The knock is likely a worn connecting rod bearing. Are you using the correct weight of oil, never use any heavier than 10W30W, heavy oil viscosity's cause slow circulation through the oil passages and starve the engine's bearings for oil.

May 17, 2012 | 2002 Dodge Durango

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Makes a knocking noise when starts and then goes away.


if this engine has hydraulic valve lifters, then it could be a weak hydraulic lifter that pumps up once the oil warms up. Hopefully you dont have low oil pressure. Does the oil light stay on for a while after you start the engine. If it does that could cause your engine to knock

Oct 05, 2010 | 1993 Lexus Ls 400

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1996 chevy s10 4.3 vortex lifters knocking at start up but goes away after 10 minutes idling. changed oil and filter oil pump reads 58-60psi at idle and seems to be working.


High milage? Try engine cleaner, run for couple hundred miles and then use an additive like Restore. If it's just dirt this may help. Make sure you are using the correct viscosity oil for winter temps. If it's from wear only parts replacement will fix it.

Feb 07, 2010 | 1996 GMC Jimmy

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I have a 1993 ford explorer with a 4.0. have replaced head gaskets and find that the hyd lifters are pumping up to the point they are keepeing the valves open. have changed lifters and have the same...


You are not letting them bleed down.

The lifters will stay "pumped" for some time after the engine is first started. Sometimes its so bad the engine won't start (if fully pumped). If the engine won't start, you can cycle the engine by hand and compress the valve springs and let it sit for a time and they will bleed down (a couple at a time then turn 1/4 turn or so and wait again), but the easiest way is to run the engine at zero lash and tighten the rockers to spec. (one CYLINDER at a time) and let the other cylinders run until the miss goes away. When the miss goes away that cylinder will be at adjusted zero and you can move to the next cylinder. The thinner the oil the faster it will stabilize (which means engine hot).

If the engine will start at adjusted (but pumped up) lash, just let it run. It could take up to 30 minutes for the lifters to leak down.

Lastly, you can pull the lifters out, remove the snap rings, remove the plungers and drain the oil. Reassemble the engine with "dry" lifters, adjust them static (engine off) then start the engine. After the engine warms up they should fill with oil and run normally.

If you don't know how to do any of this, you probably shouldn't be in there to begin with. If you adjust them incorrectly you can damage your engine.

Some engines have no adjustment and those you just have to wait to stabilize. If they won't start, you turn them by hand and let them bleed down.

Sep 28, 2009 | 1993 Ford Explorer Limited

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Hyundai engine sound like diesel engine


piston slap caused by thinner metals than usual used in this engine. there is no solution

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'96 VW Golf GL with 2.0 motor. Cold start knock


It sounds like the hydraulic lifters are bleeding down after sitting for a while... there are ball checks which are supposed to prevent this... Try using a good engine flush (a product that frees sticky lifters) and replace the oil with a good synthetic... Hope this helps...;-)

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Knocking until car warms up


Sounds like a lifter noise. worn lifters can't keep oil in them anymore so over night the oil leaks out. when you start the vehicle, you will hear a ticking noise or knocking noise till the lifters fill with oil again. only remedy is to replace the lifters.
you could try an additive but it's temporary.

Dec 23, 2008 | 2001 Toyota 4Runner

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