rpm on my wrangler se jumps to red line when started why? - Jeep Wrangler Forum
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Old 07-04-2009, 09:37 PM   #1
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Unhappy rpm on my wrangler se jumps to red line when started why?

bought my jeep last november is a 2000 wrangler se 4cyl 4xr used and loved it! but didnt know there was something wrong with it until now my radiator blew and barely made it home, checked it and there was corrosion in the water, anyways changed radiator thermostat hoses and water pump the problem was the water pump the blade was gone! well after fixing it , i tried to start the car , it did but the rpm went crazy to red line! thought it might be a sensor , checked it with a obd II reader there was no code, either way i changed every sensor speed, idle, crankshaft position , throttle position and still does the same, when ever i try to start the engine rpm goes crazy. could it be a blown head gasket since i saw oil inside the intake manifold? i need help so i can at least have an idea of what its goin on. i bought the car with my credit car cus i needed a car and still owe money dont want to spend more than i already did. cus it seems im paying more that what the actual car cost.

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Old 07-05-2009, 09:37 AM   #2
Knows a couple things...

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Invariably that problem is caused by a vacuum leak somewhere on the head or around the intake manifold or throttle body not sealing properly. Perhaps you disconnected a vacuum hose while doing your work? Most of the time this problem happens it's because someone didn't get the intake manifold properly re-seated on the head after having it off.

So whatever you do, just start looking for what vacuum line (like going to the power brake booster) is disconnected or leaking, improperly seated intake manifold, improperly mounted/seated throttle body, stuck throttle body butterfly valve, etc.

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Old 07-05-2009, 12:22 PM   #3
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found the problem ! after checkin the manifold exhaust and every vacuum line found that one of the studs in the middle of the engine that holds together the cylinder head with the block is broken ! and you can see a big gap between them.
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