2008 GMC Sierra Denali Logo
abel fabian
abel fabian Posted on Dec 07, 2012
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Knock while driving off on cold engine

On cold mornings below 40 degrees, as i turn on the engine no sounds come out. as i begin driving i hear a knocking sound, the more i press on the gas the faster the noise. does not happen in park even if revved

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raj somaiya

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  • GMC Master 5,370 Answers
  • Posted on Dec 07, 2012
raj somaiya
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Joined: Nov 12, 2010
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There are many possibilities that can cause car to make noise.

It's actually from where the noise is coming from. Front end or rear end. From engine area or from inside the steering or from brakes.


There is N-number of possibilities for the car to make knocking noise or any other kind of noise.


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For step by step troubleshooting this problem, I suggest you to refer the help links mentioned below. Its a complete solution with proper explanation to identify the cause of problem: ------


Click the link below: -----




CAR NOISE ISSUES
http://alltypesofpartsreplacing.blogspot.com/2012/11/car-noisesnoisy-cargrinding.html


=------------

These will help.

Thanks.

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Jan 15, 2009

SOURCE: ENGINE KNOCK 81 GMC 1500 (350)

IN 1981 GM MADE SOME SOFT CAMS,ALOT OF PEOPLE WERE COMPLAINING OF THIS CAM & LIFTER REPLACEMANT SOLVES THE PROMBLEM.AS FOR THE KNOCKING TAKE IT TO A PRO.

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Anonymous

  • 180 Answers
  • Posted on Jan 21, 2009

SOURCE: Loud Ticking/knocking Noise From motor; What is it?????

You have a hydraylic lifter bleeding down,they make some good oil additives that should help.

Anonymous

  • 508 Answers
  • Posted on Feb 07, 2009

SOURCE: oil pressure drops once it gets warm

Sorry to say it sounds like the motor is gone. Higher oil pressure when the oil is cold is normal. But, when the engine gets to operating temp and the pressure bottoms out and the engine knocks you have big problems. If the mileage is very high (150,000) or more your bearings are so worn that the oil can't fill the void between the surfaces and thus the low oil pressure.

GM Elec

Bruce Bracey

  • 1000 Answers
  • Posted on Apr 19, 2009

SOURCE: 4.3 vortec engine , engine noise, knocking or

The knocking or ticking is going to determine if it is in the top end, lifters, push-rod or rocker arm issue or the bottom end that would include pistons or bearings.
If it is a ticking noise, it will more than likely be a valve train issue.
If a knocking noise, piston or crankshaft related problem.

Attached is a web site that you can listen to a piston slap which is a known issue for your 4.3.
Listen to the noise and see if it sounds similar to your problem. A piston slap will generally sound as though it is coming from the central area of the engine.
Listen to the recording and let me know.
Regards,

Anonymous

  • 64 Answers
  • Posted on Nov 13, 2010

SOURCE: Knocking noise on passenger side under dash.

sounds like you have a loose fan cage for the ac/heater.

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