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engine noise

Robert Joye
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Robert Joye Enthusiast

Robert Joye

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I bought a 2009 gmc Sierra with a 5.3 vortex engine with 51000 original miles on it. It has a tapping noise at start up.quiets down after engine warms.Is this normal or do I need to have it looked at?

Dustoff87 Enthusiast

Dustoff87

Posted
Posted

It's probably one of the hydraulic lifters on one of the AFM cylinders ticking against the cam assembly. Very common problem. Could also be a small leak on your exhaust manifold which seals up after the engine warms up.

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CamGTP Senior Enthusiast

CamGTP

Posted
Posted

Piston slap is always very common to the LS engine. Once the engine warms up, the pistons expand and the noise slowly goes away.

Robert Joye Enthusiast

Robert Joye

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14 hours ago, CamGTP said:

Piston slap is always very common to the LS engine. Once the engine warms up, the pistons expand and the noise slowly goes away.

 

Sharpz Enthusiast

Sharpz

Posted
Posted
4 hours ago, Robert Joye said:

So should I worry about it ?

no. I know many people who have this issue and are pushing near 300k.  If you keep up with your truck, and keep an eye on things like Oil pressure, temp etc you should also get many miles out of your motor.

swathdiver Senior Enthusiast

swathdiver

Posted
Posted
On 3/14/2021 at 11:23 AM, Robert Joye said:

I bought a 2009 gmc Sierra with a 5.3 vortex engine with 51000 original miles on it. It has a tapping noise at start up.quiets down after engine warms.Is this normal or do I need to have it looked at?

Get a bi-directional scan tool on it and check for misfires and can also function test the  AFM system.  Do the easy stuff first, check the plugs, compression test, check for exhaust leaks, get a mechanic's stethoscope and listen around to pinpoint the noise, etc.  You can even use a screwdriver or extension stuck to your ear and whatever you want to listen to.

Dustoff87 Enthusiast

Dustoff87

Posted
Posted

Can you isolate which cylinder? If it's an AFM cylinder I'd consider getting a programmer or a range kit to deactivate it before the lifter collapses.

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