searchingforXJ
NAXJA Forum User
- Location
- Canada
So a problem developed last night with the idle of my 99 XJ, 4.0L, AW4 with ~106k miles. While in drive, when I take my foot off the gas at any speed it idles at around 1100-1250RPM. Normally it would go down to 750ish RPM. It won't drop down to the normal 700-750RPM until I come to a complete stop. If I shift into N while coasting it will drop down to this RPM as well. It's annoying because I have to hit the brakes harder to stop and it's not the way it's supposed to work. It's almost like a cruise control because it will maintain the speed I'm at if I'm on a level road.
It started last night after I had a high temp condition on the engine. I was stuck in the drive-through line for 15 mins. and the temp went up to 250ish F before I shut it off. The check engine light never came on but the check instrument light did. I was able to get back onto a road and get her up to speed to get the temperature back down to normal. I haven't had a chance yet to check if the electric fan is not working. If it is broken, could that have cause the high temp condition?
Could an overheat like this cause the weird idle condition or is it just one of those goofy coincidences?
I checked for codes by holding in the trip button and turning the ignition on. It cycled through all the #s on digital display and then showed the mileage. I didn't show the serial # as I read somewhere it should.
Does anyone know what controls the idle speed while it's gear and your foot is off the gas (and off the brakes)?
It started last night after I had a high temp condition on the engine. I was stuck in the drive-through line for 15 mins. and the temp went up to 250ish F before I shut it off. The check engine light never came on but the check instrument light did. I was able to get back onto a road and get her up to speed to get the temperature back down to normal. I haven't had a chance yet to check if the electric fan is not working. If it is broken, could that have cause the high temp condition?
Could an overheat like this cause the weird idle condition or is it just one of those goofy coincidences?
I checked for codes by holding in the trip button and turning the ignition on. It cycled through all the #s on digital display and then showed the mileage. I didn't show the serial # as I read somewhere it should.
Does anyone know what controls the idle speed while it's gear and your foot is off the gas (and off the brakes)?