Question about 2002 GMC Sierra 1500

3 Answers

1999 serria pu. 4.8l loud tapping noise. like a bent valve. took off the heads , valves ok. could it be a lifter? what else wood make a ticking tapping sound?

Posted by transam3 on

  • Anonymous Mar 18, 2014

    making a ticking noise in engine i think its a lifter will heavy old help it stop? i have 250km on it ?

  • Anonymous Mar 27, 2014

    changed timing belt still taps on all lifters

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3 Answers

Anonymous

I fixed the problem. it was 2 lifters had collapsed. the engine was sludged up. i put in all new lifters and it A ok now

Posted on Sep 27, 2008

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Anonymous

Not a auto mechanic but i just took a stethescope to mine and the injectors were definitely making a ticking noise which i originally thought was coming from the valves.

Posted on Sep 27, 2008

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Anonymous

Sometimes the fuel injectors make noise simular to lifters

Posted on Aug 19, 2008

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Most engines now use hydraulic lifters and they can leak a little, this causes space between then lifter and the push rod. This results in a tapping noise that goes away when they get warm or fill back up.
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A ticking noise in the cylinder head area is usually associated with the camshaft/followers, which may be worn.
Here's a couple if images: cause-tick-tick-noise-in-cylinder-drn4r4jcf5cpqfgonvky3zim-5-0.jpg The lobe of the camshaft wears - becomes 'rounded'

cause-tick-tick-noise-in-cylinder-drn4r4jcf5cpqfgonvky3zim-5-1.jpg The cam follower - what the camshaft pushes against to open and close the valves - can become worn.. 'dished' at the top.

It is unlikely you will have to change any valves, unless of course there is wear/damage.

The reason why the tick noise disappears when you are driving is because oil is getting pumped up to the camshaft area, between the cam lobe and the follower and acting as a 'cushion'.

A vehicle that has hydraulic lifters.. they control valve clearances by using oil. Like conventional cam followers, they can wear.

Changing your oil won't cure any wear. You could try using a valve train additive to try and quieten things down.


cause-tick-tick-noise-in-cylinder-drn4r4jcf5cpqfgonvky3zim-5-6.jpg

Hydraulic lifter:
cause-tick-tick-noise-in-cylinder-drn4r4jcf5cpqfgonvky3zim-5-10.jpg
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