Carson Potter

I have a 95 ZJ, running really rough (idling and while diving) and is also running pretty rich. My question is if the sensors on the throttle body (idle air control valve/ throttle body position sensor) could be causing the rough running. I know its probably the 02 sensor is causing it to run rich so I guess my question is there only one 02 sensor on it since it is 95 ZJ (ODB1)?

Also, there’s a snorkel on it (I’ve been meaning to take it off) could that be causing a rough idle because it’s limiting the amount of air coming through the intake?

BlueRidgeMark

Yes, it could be the IAC or TPS, but you're right, it's probably the O2 sensor.

I'm not sure on the count, but it's not hard to find out. They are pretty obvious. I'm guessing you have one on the downpipe (exhaust manifold) and one behind your cat. If you do have one behind your cat, you can ignore it. It does not affect your engine. It's just there to monitor the health of the cat.


Here's what they look like (not your vehicle, but this will tell you what to look for):

dave1123

AFAIK, most OBDI systems only had one 02 sensor.

Carson Potter

Also, there’s a snorkel on it (I’ve been meaning to take it off) could that be causing a rough idle because it’s limiting the amount of air coming through the intake?

BlueRidgeMark

If it's very badly made, or if it's plugged, maybe....