1992 GMC Jimmy carbon build up in EGR valve

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MEMBER
1992 GMC JIMMY
6 CYL
2WD
AUTOMATIC

1992 GMC Jimmy. I've read that the GMC Jimmy's are sort of prone to getting carbon build-up in the intake manifold. Is there any kind of carbon cleaner or cleaners that you could recommend that I could use to spray into the throttle body to clean it out, without harming the other components? I'm kind of new to having a fuel-injected truck. I've always had a carburetor in my cars. The problem that I've been having is that I keep getting carbon pieces flaking off and getting trapped in the EGR valve.

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MEMBER
4,540 POSTS

The intake manifold should be removed to properly clean the carbon buildup from the inside of the manifold. On engines with high mileage that are starting to use oil, the oil causes a carbon buildup to occur at an accelerated rate.

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Monday, January 10th, 2011 AT 11:58 PM

WRENCHTECH

MECHANIC
20,761 POSTS

Most of the chemicals that actually work are commercial grade and need special tools to apply them properly. Your best bet is to find a competent shop that will do a fuel Induction service and that will give you the best results. Nothing you can feed it will do much good. After the cleaning, take it out for some hard acceleration runs to blow out loose pieces.

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Tuesday, January 11th, 2011 AT 12:14 AM