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  #1  
Old November 12th, 2008, 13:05
BADaXJ BADaXJ is offline
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Idle Issues

'91 4.0L: when i start it up and it's cold outside, it idles up to about 2k RPM until it warms up then it idles normally for the most part. but if it idles for any extended amount of time, it will once and a while sound like it wants to die. it's just a real quick sputter, like a mis-fire/ back-fire almost. it's fine for the most part but once in a while it's just a real quick sputter, like when the aux fan or a/c kicks on in a car... sounds like the high idle could be a vacuum leak but would that make sense if it goes away when it warms up? what about the IAC? do you think the fuel pump could be the surging/cutting issue?
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Old November 12th, 2008, 13:46
89xj 89xj is offline
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Re: Idle Issues

should be in oem tech, but

could be dirty/sticking iac

could be loose intake/exhaust manifold bolts. once the manifolds heat up it could seal the leak.

if you suspect a fuel pump issue, put a gauge on the fuel line and test it.
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Old November 12th, 2008, 14:58
BADaXJ BADaXJ is offline
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Re: Idle Issues

yeah, you're right... i posted in the wrong forum. my bad, i haven't been on for a while and wasn't thinking... i'm going to try cleaning everything and checking the usuals as i haven't really looked into it yet, just looking for ideas right now since i havent had time to tear into it. thanks
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Old November 12th, 2008, 16:47
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ehall ehall is offline
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Re: Idle Issues

the IAC is cheap enough that it should be replaced whenever anything weird happens with the idle... that's what the idle air controller does
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