99 GMC Jimmy fuel economy

6 messages, Last post on Mar 11, 2009 at 6:32 PM

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What is this discussion about? GMC Jimmy, GMC, SUV

#5 of 6 Re: 01 gmc jimmy [theyard1] by hughes70 Jan 22, 2009 (10:51 am)
Replying to: theyard1 (Jan 22, 2009 9:45 am) Mine didn't end up being fuel pressure reg leaking, it ended up being the intake manifold gasket. It is finally up and running no check engine lights or anything!! Thanks for your post though.
#6 of 6 99 GMC Jimmy 2 door 4.3L by vince_27 Mar 11, 2009 (6:32 pm)
My Jimmy has 153,000 miles on it. Lately it wont start. It will rollover but not fire up. After it rolls over, I turn off the key and it sounds like compression coming out of the air filter for a few seconds, and there is some smoke coming from the air filter? I kill the battery trying to start it? I have to jump it to get it to start. When it does start up there’s lots of black some coming from the tail pipe they last for about 5 seconds? Any ideas what could be going on?