98 Misses at idle

icrxtacyi · Jan 5, 2008

I have a 98 that misses when it idles. It seems fine when driving. Although sometimes it starts to sputter and loose power, but if i let off the gas and hit it again it will stop sputtering and run normal again. The plugs, rotor, cap, wires, and coil have all been replaced. This is really starting to annoy the crap out of me and i am out of ideas as to what it is.

89xj · Jan 5, 2008

have you cleaned the IAC and throtle body?

also have the battery load tested and there is no corrosion on the battery terminals.

MJR · Jan 5, 2008

Did it just start doing this? Was anything done prior to it doing this?

icrxtacyi · Jan 6, 2008

well it used to backfire in the intake once and awhile and loose power. So I think I am goin to change the O2 sensors today and see how that goes.

yossarian19 · Jan 6, 2008

89xj said:
have you cleaned the IAC and throtle body?

also have the battery load tested and there is no corrosion on the battery terminals.

IAC = What?
My jeep has the same issue, been intermittent since I bought the thing. Doesnt seem to do it in cold weather. Keep us updated!

REPOXP777 · Jan 6, 2008

Sounds like vapor lock at the fuel rail when it gets hot . If it was backfiring I would check the fuel presure at the rail .

89xj · Jan 7, 2008

yossarian19 said:
IAC = What?
My jeep has the same issue, been intermittent since I bought the thing. Doesnt seem to do it in cold weather. Keep us updated!

idle air control or stepper motor. its on the throttle body.

Tim_MN · Jan 7, 2008

REPOXP777 said:
Sounds like vapor lock at the fuel rail when it gets hot . If it was backfiring I would check the fuel presure at the rail .

Vapor lock is almost always a starting issue, not a running or driveability issue.

Look at the usual suspects, a dirty IAC, failing CPS (and the O2 sensors on high mileage Cherokees).

icrxtacyi · Jan 8, 2008

O2 sensors did the trick.

98 Misses at idle

icrxtacyi

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89xj

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MJR

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icrxtacyi

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REPOXP777

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Tim_MN

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icrxtacyi

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