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95 Sport... Again

ScottW

NAXJA Forum User
Location
Colorado Springs
Replaced the distributor pickup and got it running again, she runs great once started but start up is either rough or at about 200 rpms then jumps up to around normal. Just curious if there is something wrong or if its just old age. And if there is something wrong how should I go about fixing it?
 
The IAC--idle air controller--is a stepper motor that responds to extend and retract commands from the PCM.

Your XJ needs to idle between 700 and 750 RPMs after 20 minutes of driving--manual trans in neutral and auto trans in DRIVE with parking brake set and someone's foot on the service brake pedal.

I would remove the IAC, then clean the throttle body with an approved cleaner, paying particular attention to the IAC port. Cotton-tipped swaps, old toothbrushes come in handy for this job. Then clean the pintle on the IAC--be gentle, they will break and then you will have to get another.

Other things that can effect the idle speed is running too rich--which lowers the idle speed; or running too lean--which raises the idle speed (so that isn't your problem).

Things make make your XJ run rich: engine runs too cold OR the PCM thinks it is running too cold--thermostat or CTS (not the gauge/light sender in the head). Bad o2 sensor. Exhaust leak upstream of the o2 sensor. Bad MAP. Bad MAT.
 
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