Only when it's cold it does this, after starting and your driving down the street it starts to miss or has no power, if I play with the gas pedal after a very short time it's okay, but if I'm get caught at a light my rpm's really drop. If after starting I let it run awhile it never does this.
'99 TJ missing
Dec 10, 2006
2 Replies
That can be a symptom of a dirty connection on the TPS. I clean the connection with a spray contact cleaner and am usually good for another year or two.
Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail >
Let's start with the IAC (Idle air control) If that is sticking it will cause a very low idle. Although it doesn't cause misses or sags. That's more timing or spark. Easy thing first.
Grab a can of TB cleaner that's safe for O2 sensors, disconnect the air horn, and with the engine running, warm, spray into the idle air passage. With the engine off, spray around the body and the butterfly (a toothbrush works well to clean the sides. Then restart and spray it a bit more to clear off all the gunk.
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You will also want to disconnect, clean, and put a bit of dielectric grease on all the connectors. Engine temp, CamPS, CrankPS, idle air motor, and throttle position sensor. Sometimes simply disconnecting a sensor and reconnecting it wipes any corrosion from the contacts. Plus you get a chance to eyeball the connector for any problems.
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