Question about 1997 Jeep Grand Cherokee

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96 Jeep grand cherokee. 4.0 Running rough and

96 Jeep grand cherokee. 4.0 Running rough and very rich. At startup (warm or cold) there is 60 kp of manifold vacuum, but it drops to about 44 kp after a minute and the running rough and rich problems start. No codes. I also have high fuel pressure at the rail. About 55 psi? any ideas?

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Fuel pressure seems a bit high...could be a bad regulator. can't remember if yours is on top of the sending unit (on tank) or on the fuel rail though. Do more testing there.

Posted on Jan 13, 2010

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Posted on Jan 02, 2017

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