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Old 04-06-2012, 06:18 PM   #1
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High idle after exhaust manifold change

I read all the things on this and I can figure it out. I pulled the intake back off got a new gasket and put it back on. Everything is flush and bolts are tight. Intake is tight against the head. All vacuum lines are on and still really high idle. Please help. Don't know what else to do.

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Old 04-06-2012, 06:27 PM   #2
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Quote:
Originally Posted by DarinJ
I read all the things on this and I can figure it out. I pulled the intake back off got a new gasket and put it back on. Everything is flush and bolts are tight. Intake is tight against the head. All vacuum lines are on and still really high idle. Please help. Don't know what else to do.
Are you sure all vacuum lines are on and not leaking/pinched.. Also sounds stupid but if your drive by wire try to reset your ecu.. If not drive by wire make sure cable is not holding throttle open

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Old 04-06-2012, 06:37 PM   #3
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It's a 99. Vacuum lines are good. Reset ECM by disconnecting neg terminal? If so did that. Throttle good. Wtf
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Old 04-06-2012, 06:37 PM   #4
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I suspect your manifold is not fully seated...it may not be correctly aligned with a stud.
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Old 04-06-2012, 06:50 PM   #5
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Do you think that having the lower 4 bolts in before I put the intake in would make it not seat correct?
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Old 04-06-2012, 06:58 PM   #6
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Do you think that having the lower 4 bolts in before I put the intake in would make it not seat correct?
Hard to say, I did it that way (having the lower 4 bolts in) when I replaced mine and didn't have any issues. I also opted for a better Felpro gasket and did not use the cheapo gasket that came with the new manifold.
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Old 04-06-2012, 07:01 PM   #7
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I got a felpro gasket today. Which side is the manifold side?
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Old 04-06-2012, 07:06 PM   #8
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Sorry I did mine over 5 years ago and don't recollect ... Perhaps someone will chime in...
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Old 04-06-2012, 07:09 PM   #9
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Old 04-06-2012, 07:16 PM   #10
Knows a couple things...

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There are some fairly subtle positioning studs on the head that the intake manifold has to be properly positioned over for there to be an air-tight seal. Together with Island TJ, I too suspect that it simply is still not seated properly... this is a common issue and it is nearly always caused by the intake manifold not being quite properly positioned.
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Old 04-06-2012, 07:29 PM   #11
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Yea I saw them there. I'll have to take it off again tomorrow and try again maybe without the lower 4 bolts in. Thanks

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