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On a 2009 Chevrolet Uplander with 3.9L engine, 70,000km, has an intermittent engine noise like a knocking and it goes away when the engine has warmed up - do you know what might be causing this, or does anyone else have this problem?

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  • brgibson Nov 18, 2013

    44,000 miles

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Oil starvastion to berings

Posted on Nov 18, 2013

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Either the valves or knock sensor most proberly the valves

Posted on Nov 18, 2013

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Posted on Jan 02, 2017

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SOURCE: knocking when first start engine

Depending on the period of time and intensity of the knock ? If it is a rapid short ,loud knock then disappears altogether you may be dealing with a cam chain tensioner that is loosing oil pressure when the car is standing. A loose cambelt tensioner can increase the noise .

Posted on Jul 29, 2008

  • 66 Answers

SOURCE: IN THE MORNING FIRST START SOUNDS LIKE TAPPING AND KNOCKING NOISE

ck intake gaskets make sure there is no antfreze mixing in oil and breaking oil down if gakets are ok run a factory oil filter and go up agrade in oil such as 10w40

Posted on Dec 17, 2008

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SOURCE: 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.

Posted on Dec 24, 2008

  • 77 Answers

SOURCE: knocking noise coming from belt area. when belt

Had the same issue and it turned out to be the balancer. Not too difficult to fix any questions or advice, I am happy to help you. Justlet me know. Good luck

Posted on Nov 22, 2009

  • 1 Answer

SOURCE: Engine make Knocking noise when cold

I have the same problem on my 2.0L 2001 Legacy auto. It began about 1000 miles ago. It has now done 84k. From my online searches this is most probably 'piston slap', and is not serious. To save weight Subaru shaved down the skirts on the pistons. With normal engine wear the pistons will at some point rattle against the cylinders until the engine is heated up and the pistons expand. The rattling should go away after a few minutes. If it persists say 10-15 minutes, it may be another problem.

Posted on Nov 26, 2009

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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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could it be a high pitch knocking like a ticking-this would be a lifter thats not pumping up right any-it may be time for oil change to winter oil-5w20-oil change could help anyway-cheers Denny

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Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

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After it's warmed up to operating temp, if it makes the noise at idle but goes away reving the engine, I would guess that a lifter has gone bad. Rod bearings as a rule knock all the time. It's hard to diagnose these things over the internet, because there are so many variables when it comes to noises.

You need to warm the car up and then while it is running, open the hood and try to pinpoint the source. lifter noise will sound like a "tick" and come from somewhere near the top. Rod bearings will sound like a 'knock" and will come from the bottom of the engine.

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I have a engine knock on a cold start. Knock goes away after engine gets warm


That is an indication of worn internal engine parts, it quiets down when warm because the metals expand tightening up the fit between parts. If it is a true knock then the parts that are most likely worn and causing it are main/rod bearings, or piston bores/rings.

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it may need a lifter or valve adjustment when cold they will tick or knock depending on how loose or worn out then when it warms up they swell with heast and noise stops. after adjusting or replacing it will stop making noise

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