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Old 06-08-2014, 05:24 PM   #1
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High idle after after intake/exhaust gasket replacement.

Just as the title reads. I have a 91 4.0 and it had a high idle. I used the carb cleaner trick to locate a leak at the intake/exhaust manifold gasket. So after several hours of cursing along with some blood, sweat and almost tears, the new gasket was on. Pretty ridiculous that I had to take off the power steering pump and bracket to get the intake and exhaust manifold off. Anyway, I put it all back together and checked everything and now the Jeep idles at 1500 rpm. Suggestions? I tried to make sure there wasn't a vacuum leak and didn't find anything. I did find that the exhaust manifold has a crack in it where the tubes come together. I'm at a loss. Is there a way to adjust the throttle? Also, it smells like it's running a little rich. Any help would be greatly appreciated.
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Old 06-08-2014, 05:26 PM   #2
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Old 06-09-2014, 06:21 AM   #3
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Still sounds like a vacuum leak. Double check everything especially your vacuum lines and the plastic fittings. It all gets brittle and can crack.
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Old 06-09-2014, 07:11 AM   #4
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A tip that might help - when I did this debugging before, I used little rubber caps from the auto parts store to block off every vacuum line to the intake except for the MAP. Buy an assortment pack, and you'll find a size to fit every fitting. Don't forget to check around the throttle body gasket for your leak.
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