stephenspann27
NAXJA Forum User
- Location
- College Station, Tx
My '87 XJ has erratic idle.. it will idle normal for a few seconds, then low.. a misfire a few times, then idle back up.. over and over. I've done quite a bit of trouble shooting, and replacing of parts.
Rather than list all the things I've replace or checked.. I'd like to just focus on whether the O2 could cause this problem.
I tried Ohming out the contacts on the 'o2 sensors plug and they all three read "open" I've read that at least the ground to heater wire should read "closed." I also read that you can damage the o2 by ohming it out because you are sending voltage through it.
In spite of my weird idle.. I get great MPG.. and I never get a misfire during normal operation or acceleration.. no misfires ever.. except for idle...
I know a bad o2 could cause the idle issue I have.. but I would just think I'd have other problems also..
I also know that the o2 only comes into play during closed loop. when the engine is cold, and I crank it.. it idles perfect for the first 10-30 seconds.. then the idle issues starts (maybe around when it goes in to closed loop) However, if the engine is hot, it will misfire as soon as I start it.
Rather than list all the things I've replace or checked.. I'd like to just focus on whether the O2 could cause this problem.
I tried Ohming out the contacts on the 'o2 sensors plug and they all three read "open" I've read that at least the ground to heater wire should read "closed." I also read that you can damage the o2 by ohming it out because you are sending voltage through it.
In spite of my weird idle.. I get great MPG.. and I never get a misfire during normal operation or acceleration.. no misfires ever.. except for idle...
I know a bad o2 could cause the idle issue I have.. but I would just think I'd have other problems also..
I also know that the o2 only comes into play during closed loop. when the engine is cold, and I crank it.. it idles perfect for the first 10-30 seconds.. then the idle issues starts (maybe around when it goes in to closed loop) However, if the engine is hot, it will misfire as soon as I start it.
Last edited: