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'02 Chevy Z-71 5.3L Intake Manifold

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New User

Sep 19, 2009, 5:02 AM

Post #1 of 4 (3754 views)
'02 Chevy Z-71 5.3L Intake Manifold Sign In

I have a 2002 Chevy Silverado 1500/Z-71 with the 5.3L, 160K miles. My check engine light came on and after having it put on a machine was told it MAY be the intake manifold gasket. They didn’t sound real sure of themselves so wanted to get some feedback from other sources. Engine light is on and it starts and runs fine in warm weather. In weather 50 degrees and below the engine revs way up until the engine warms up. I ran my own test by spraying a little WD-40 around the intake and got a reaction around the number 8 cylinder. Am I on track? Do I need to replace the gasket? Have been reading about numerous GM gasket failures mostly on the V6 types and am not seeing any antifreeze in my oil.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Sep 19, 2009, 6:00 AM

Post #2 of 4 (3745 views)
Re: '02 Chevy Z-71 5.3L Intake Manifold Sign In

IMO - I you get a reaction from spray - carb cleaner, brake cleaner or even the WD-40 where it shouldn't be there's a problem there,


Hammer Time
Ultimate Carjunky / Moderator
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Sep 19, 2009, 6:06 AM

Post #3 of 4 (3741 views)
Re: '02 Chevy Z-71 5.3L Intake Manifold Sign In

We would need the exact code number to have any idea if they are on the right track. Those manifolds are known for coolant leaks at the intake gasket but vacuum leaks are a little more rare.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Jeff Norfolk
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Sep 20, 2009, 8:03 PM

Post #4 of 4 (3730 views)
Re: '02 Chevy Z-71 5.3L Intake Manifold Sign In

I think the 5.7 is more common on coolant leaks. The 5.3 has a very common vacuum leak problem. With a reaction from spray that is likely the cause.

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