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?

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  • 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

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

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

Sometimes the fuel injectors make noise simular to lifters

Posted on Aug 19, 2008

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2 Answers

Valve tap cause


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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It wouldn't start with bent valves. If you have changed the cam belt and not set it correctly then you may have damaged the valve gear but the ticking is likely to be a worn camshaft or dud lifter.

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By not changing the oil you compromised everything. The oil is old and tired and now its got the gasket debris and else from the head swap. The tapping noise is a dud lifter or worn camshaft. You need to better describe where the smoke is coming from as it may just be spillage where you swapped the head getting burned off.

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What cause tick tick noise in my cylinder head,funny part when I drive& apply clutch the noise disapear.(Ford bantam 1.8diesel endura de) do I need to change oil or bent valves? Pls help


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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Hello Francois, the tapping sound you hear might be coming from a bad valve lifter, a bad camshaft lobe, a bent push rod, a broken valve spring, a broken rocker arm or the valves may need to be adjusted.

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if you have a stethascope or even a wood dowel i would check the lifters. if you have higher miles this sounds like a hydraulic lifter pumping up. if you change to a heavier oil it will go away or reduce. thats the cheap fix.

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yes could have burnt ,bent-valve,/damaged rocker arm,/lifter [collapsed,flattened ] ,/push rod [burnt,bent] or ur oil over heated enough to sludge up the valve train and starving some of the components either way to correct the problem correctly [not add oil additive to help noisy engines]u have to pull off the valeif its a lifter cover and inspect the head unit for which component is problem

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