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Old 04-19-2010, 06:50 AM   #1
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Exclamation Changed my header now big problem!

I swapped my header because the old one was cracked, now when i start it, it revs uncontrollably! swapped gaskets cleaned the surfaces and tightened the bolts as close as i could get in those tight spaces. please help!!!!!!

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Old 04-19-2010, 07:02 AM   #2
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I think I read that's due to the gasket/manifold or something being positioned incorrectly (not fitting it into some grooves its designed to fit into or something like that) causing it not to seal properly.

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Old 04-19-2010, 07:20 AM   #3
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your intake manifold is sucking air at the gasket, causing it to lean out and rev up. best bet would be pul it back off and check your manifold at the base and gasket position. There is dowel pins that locate it, might be sitting on one instead of sitting in place. Mine wasn't lined up right when I did mine, and crached the intake manifold.
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Old 04-19-2010, 07:24 AM   #4
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i just checked it, on one side i can see it sealed all around, on the other i can see its tilted. thanks for the help but I'm still walking to work lol
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Old 04-19-2010, 07:43 AM   #5
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When you installed it did you follow the torque down sequence. It is a good idea, since using that helps it pull in even, if you tighten one side down then the other it may never seat itself perfectly flush. BTW you didn't use gasket sealer on it did you? Header gaskets are a dry type gasket and not meant to have any kind of sealant, just the heat of the engine to seal itself in place.
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Old 04-19-2010, 10:50 AM   #6
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Your problem is caused by nothing more than the intake manifold not seating completely, allowing a vacuum leak that lets the engine rev way high. Most of the time, it's caused by not getting the intake manifold properly positioned over the little positioning studs. Don't just tighten the bolts tighter, take it off to see what I'm talking about & then reinstall it to make sure it is properly positioned and then tighten the bolts per the factory specs.
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Old 04-19-2010, 08:00 PM   #7
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ok, quick question though, it seems that the dowel pins are not coming out far enough, is it possible to pull them out a bit?
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Old 04-19-2010, 08:03 PM   #8
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The dowel pins don't need to be out far enough to fully engage the intake manifold, they only serve as a guide for proper positioning. Just position the intake manifold so its underside matches up with them.
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Old 04-19-2010, 08:18 PM   #9
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i can get it on, on one side but i cant on the other, it does not come out far enough it seems. i'll have to play with it more in the morning when i can see it.

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