CamoChero
NAXJA Forum User
- Location
- Dallas, Texas
I have an '88 4.0 aw4 and every now and then, when I start it up it will idle around 1750-2250 rpms. I shut it off and restart it and that takes care of it for a while. It doesn't matter about heat or cold, or day/night, full moon, planet alignment or any other situation lol. It seems totally random. Sometimes I have to shut it off and turn it back on a couple of times to get it to "fix" itself. I'm thinking it might be the IAC but not sure. I just recently purchased it, so I'm not sure about tune-ups and what not, nor any idea the last time an O2 sensor was replaced. The only thing I have been able to do so far has been some gaskets and an oil change. The high idle thing doesn't affect it while its running, i.e. it won't happen while I'm sitting at a red light or stop sign, it just happens on start up. Any ideas?