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Old 11-25-2009, 04:16 PM   #1
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Engine trying to take off

I'm new to this site and really hope I can find out how to fix this. I have a 1998 Jeep Wrangler Sport that me and my son have basically rebuilt (still in the process) anyway we finnally got it to start but when it does start the RPM's go to redline very quickly. We have recently replaced the computer with a remanufactured one (yes it was pre-programmed or flashed) also the fuel control senser, the idle speed control motor, the crankshaft position sensor along with a host of other parts. If anyone has ANY ideas they would be greatly welcomed. Oh the motor is a 4.0L with the MPI system.

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Old 11-25-2009, 04:36 PM   #2
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Welcome to the forum. Could you possibly have a vacum leak somewhere? Intake, vacum lines ect,.

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Old 11-25-2009, 07:37 PM   #3
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We recently had the exhaust/intake manifolds off, so I guess that's possible. But will an exhaust leak rev the engine to it's max rpm or just make it idle high?
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Old 11-25-2009, 07:47 PM   #4
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An exhaust leak would not bother your idle but a leak on the intake manifold would raise hell with your idle. Did you make sure and get the manifold on the little dowel mounting pins and get it torqued correctly?
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Old 11-26-2009, 09:02 AM   #5
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after reading some past post on this forum, YES we are planning on removing the intake, rechecking gasket and putting it back on with the correct hardware thie time. We had to substitute some of the bolts and security washers due to the previous owner disassembly and loss of LOTS of hardware. Guess we are going to have to go to a jeep dealer to find the correct bolts and washers.
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