90xj06
NAXJA Forum User
- Location
- Peabody, MA
I have been plagued with a low "ish" idle problem for a while now. I have a new rebuilt engine with 11k Miles on it. Runs fine and idles smooth just low. Around 550-600. And sometimes almost stalls or stumbles. When cold started it idles up fine and once warmed it sits low. All sensors are reporting correctly as I have read the ecu data.
Throttle body is clean and there are no vacuum leaks. There is a bypass screw on the side that was closed all the way. I adjusted out a smidge and the idle went up. Then the ecu corrected it and brought it back down. So I set that back.
Also when the ac is turned on it idles up as it's supposed to.
The only thing I'm questioning is possibly the o2 sensor. It's new but it doesn't always like going into closed loop on the first shot. It will go closed loop. Before it's swinging and will start dying and pop back into open loop and recover.
I have done battery cable upgrades and ground upgrades and cleaning.
88 xj
What's the best o2 sensor? Bosch? And what exactly is the idle speed when in gear? Or park?
Throttle body is clean and there are no vacuum leaks. There is a bypass screw on the side that was closed all the way. I adjusted out a smidge and the idle went up. Then the ecu corrected it and brought it back down. So I set that back.
Also when the ac is turned on it idles up as it's supposed to.
The only thing I'm questioning is possibly the o2 sensor. It's new but it doesn't always like going into closed loop on the first shot. It will go closed loop. Before it's swinging and will start dying and pop back into open loop and recover.
I have done battery cable upgrades and ground upgrades and cleaning.
88 xj
What's the best o2 sensor? Bosch? And what exactly is the idle speed when in gear? Or park?