Recent content by swampass2

I'm still sort of stumped. Put in a new TPS and it showed the same voltage range, so I put the old one back on. Replaced the IAC and it idles higher when first started, put it in park and the RPM's go down, but then after that no change in idle speed (i.e. if I shift back into Park the revs...

engine runs with IAC rmoved but still connected to the wiring harness. just revs high from the extra air coming through the IAC hole to the throttle body.

Should have mentioned that input voltage to the TPS checked out fine. Also, I just pulled the IAC again. Not sure if it's working right. Here's what happens: 1) Turn ignition on, engine off, IAC pintle retracts. 2) Start engine, pintle pushes out slightly. 3) Put it in drive, pintle pushes...

Cleaned the IAC. It was very sludgy. Noticed a little less of the RPM "blip" that was happening after I left off the gas and a slight (very slight maybe 50 RPM) change in idle speed when shifting from Park to Drive. Never did that before, it just always idled at the same speed. Still have...

Just checked the MAP and TPS. MAP is spot on. Service manual specs for the TPS are between .26 and .95 volts at closed throttle and "less than 4.49 volts" at WOT. Mine tested at .91 at closed and 3.9 at WOT. Voltage changes smoothly throughout the throttle range. I'm wondering if anyone...

Don't seem to be any problems with the TC. Transmission shifts fine and no slipping. But since you mentioned it the RPMs don't drop nearly as fast when the Jeep's in park and I blip the throttle. Only happens when driving, so I wonder if it's something TCU or otherwise computer related. I...

So I've had my 99 4.0 XJ AW4 for a year and a half and gas mileage has always been terrible (10 city, maybe 14-15 highway bone stock). Needless to say I've read every gas mileage thread on here. I'm investigating everything I possibly can to bump my mileage and lately I've been focusing on what...