Noise in 4.8 L chev motor.

« **on:** May 03, 2011, 01:30:25 PM »

There has to be some Chev Techs out here. I have a 2007 truck with a 4.8L that is making a funny engine noise. It sounds like a metal rattling noise on the drivers side . Disconnected belt so i know that its not belt driven equip. Not valves or rods because the motor runs good, no check engine light. Not from flywheel because when i rev it up id stays pretty consistant. Any Ideas

« **Reply #1 on:** May 03, 2011, 01:49:21 PM »

Quote from: terrytav on May 03, 2011, 01:30:25 PM

There has to be some Chev Techs out here. I have a 2007 truck with a 4.8L that is making a funny engine noise. It sounds like a metal rattling noise on the drivers side . Disconnected belt so i know that its not belt driven equip. Not valves or rods because the motor runs good, no check engine light. Not from flywheel because when i rev it up id stays pretty consistant. Any Ideas

possible catalytic converter? go under and bump it by hand a few times (make sure its not hot). if it rattles its bad, or maybe just the shield is loose.

« **Reply #2 on:** May 03, 2011, 01:50:25 PM »

Does it do it warm, cold, all the time? At idle, under load, RPM range? How loud is it? When these came out, there were some piston slap issues but they cleared up when warm.

« **Reply #3 on:** May 03, 2011, 02:19:41 PM »

Noise is there at idle, hot,cold and increases at rpm,s but not as fast as motor is turning. It is definately inside the motor.I heard they use some sort of plastic shield around the push rod,so i thought i could find someone more familiar with this motor.

« **Reply #4 on:** May 07, 2011, 09:48:42 PM »

Quote from: lbhsbz on May 03, 2011, 01:50:25 PM

Does it do it warm, cold, all the time? At idle, under load, RPM range? How loud is it? When these came out, there were some piston slap issues but they cleared up when warm.

I am going to have to say this is it most likely.I have had a lot of friends with these motors in their truck and they have been needed to be replaced under warranty. One of them has over 200k on his and that thing rattles like a bearing in a tin can.

terrytav

Noise in 4.8 L chev motor.

ka0tyk

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lbhsbz

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terrytav

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74 howard 21rc

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