idle issue after changing exhaust manifold -
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post #1 of 7 Old 07-25-2013, 03:08 PM Thread Starter
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idle issue after changing exhaust manifold

Ok, i know i probably screwed something up. I just finished replacing the exhaust manifold on my 99 Cherokee 4.0, which of course meant i had to remove the intake manifold, power steering pump and electric fan to do it. I put everything back together and now when i start the motor it immediately wants to red line, so i shut other down. I double checked all my electrical connections and they look good. Any idea what is wrong?

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post #2 of 7 Old 07-25-2013, 04:32 PM
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With the motor running that fast it has to be getting air from somewhere. Double check the throttle body. Make sure there is nothing holding the throttle plate open.

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post #3 of 7 Old 07-25-2013, 04:37 PM
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Recheck all the manifold bolts, might have missed one so the intake is sucking in lots of air
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post #4 of 7 Old 07-25-2013, 05:20 PM
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Those are common symptoms of incorrectly re-installing the intake manifold. There is a massive air leak at the intake manifold gasket.

You will have to unbolt the intake manifold, and re-seat it square and flush to the head. If necessary, run a drill bit into the holes the dowel pins fit into to clean them up and make them slightly larger.


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post #5 of 7 Old 07-25-2013, 05:21 PM
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I just recently changed my cracked manifold, I got everything together and it immediately red lined when I started her up.

I took off the intake and tried putting it on again, and that fixed my issue.
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post #6 of 7 Old 07-25-2013, 06:23 PM Thread Starter
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Thanks guys. I looked some more with a mirror and found the pins were not lined up. Got them lined up now and just snug. Will finish tomorrow and let you know how it goes.
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post #7 of 7 Old 07-27-2013, 11:07 AM Thread Starter
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Amazing what happens when get the pins lined up. Hour or so to get it together but its done and working perfect. Thanks again.
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exhaust , idle , intake , manifold , timing

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