returning check engine light
#14
RE: returning check engine light
If it only does it when it's cold then it's probably intake gaskets leaking. Try this: when you start it cold, take some brake clean and spray around the intake and see if the idle changes. if it does, then your intake gaskets are leaking. If its a 5.3, that's a common problem. GM has updated gaskets for them. I've replaced alot of them (I'm a tech at a GM dealer). They'll run you about $100. They're not too bad to replace. Also, if you're running aftermarket spark plugs, put AC Delco in it. Fixed alot of misfires by replacing aftermarket pulgs with Delco.
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alby
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07-11-2012 11:22 AM