TJ What would cause idle flare-up between shifts?? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 05-28-2002, 07:36 AM Thread Starter
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TJ What would cause idle flare-up between shifts??


When cool or cold in the morning my TJ has what is called idle flare-up between shifts.
If I shift at 1500 RPM the engine can accel as high as 2000 RPM and then return to normal idle RPMs.
It does happen in every gear shift. Once the engine is up to normal operation temp it is somewhat more driveable but still DOES NOT return to a proper idle speed as fast as it should.
Ther is no linkage hangup of any kind.
I keep the throttle body very clean.

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post #2 of (permalink) Old 05-28-2002, 07:40 AM
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Re: TJ What would cause idle flare-up between shifts??

try removing your foot from the gas pedal between shifts [img]images/icons/laugh.gif[/img]

JK, Sorry had too. I got no idea, that's justwhat popped in my head first.

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post #3 of (permalink) Old 05-28-2002, 08:54 AM
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Re: TJ What would cause idle flare-up between shifts??

Sounds similar to the problem I just had with my 2.5L. One of the intake/exhaust bolts had fallen out, and the others were loose. This created a vacuum leak. Put the bolts back in and the problem went away. You might want to clean your Idle air control while you're in there also. I also discovered that there is a secondary throttle return spring. This spring was broken and half of it was missing on mine.
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