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weird idle after head gasket replacement?

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Old 12-15-2010, 06:05 AM
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Default weird idle after head gasket replacement?
I blew my head gasket on my S, took it all apart, milled my head, put it back together and now it is doing a really weird idle. I can rev it to a certian point and it will go nuts reving up and down in a sparatic form. The only thing i could think us is that i screwed up timing somehow, but it seems like if i had it wouldnt idle smoothly. Anyone have any ideas?
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Old 12-15-2010, 06:12 AM
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Reving up and down on its own is a stuck IAC valve.
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Old 12-15-2010, 06:26 AM
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would this happen when i twist the throttle but still idle normally?
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Old 12-15-2010, 06:28 AM
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I have built the brian crower stroker motor, and have not had it tuned yet, but i was driving it without a tune before it blew a head gasket and it ran just fine, no jumpy idle or anything.
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Old 12-15-2010, 02:14 PM
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Make sure the map sensor is plugged in.
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Old 12-15-2010, 02:18 PM
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Originally Posted by flyingtoaster,Dec 15 2010, 03:14 PM
Make sure the map sensor is plugged in.
Absolutely. Make sure all electrical and vacuum connections are accounted for.
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Old 12-15-2010, 04:01 PM
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where is the map sensor located?
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Old 12-15-2010, 04:20 PM
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top of the throttle body
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Old 12-15-2010, 04:22 PM
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Old 12-15-2010, 04:32 PM
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Yes the map sensor is definitely plugged in, i dont know what else it could be, its just such an odd thing to be happening?
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