shawn Posted May 3, 2011 Share Posted May 3, 2011 ......when it doesn't run great, - which is sometimes, so i took it to a shop and they diagnosed it as an IAT sensor, but can't find one anywhere.( btw it's an 86 2.5 l 5spd 4x4). apparently it has to be from an 86. can anyone enlighten me on this? they said they had pinpointed it right to this sensor. as a side note (maybe) it has been experiencing run-on lately when i shut it off. Link to comment Share on other sites More sharing options...
1987Comanche Posted May 3, 2011 Share Posted May 3, 2011 Intake Air Sensor. On the Renix 4 Cyl it should be located on the firewall side of the intake manifold in a threaded port. It looks similar to the CTS but stays dry since it only measures air charge. There's a resistance/temp chart for it but basically the resistance should be pretty close to the CTS from cold start through about the 1st 5 min of idle. After that intake air temp and coolant temp start going their separate ways. Link to comment Share on other sites More sharing options...
shawn Posted May 3, 2011 Author Share Posted May 3, 2011 ...... is there some way to adapt one from a different year of 2.5? another thing is the idle keeps changing, -not drastically, but frequently. I'm amazed by the power this little motor has when its running well, but when its not, if can hardly make it up a hill ----- and there's a lot of hills in my neighbourhood. Link to comment Share on other sites More sharing options...
airspeed Posted May 4, 2011 Share Posted May 4, 2011 I was just looking on Rock Auto and they show the IAT for 88 2.5l, but not for 87? It is under emissions, they have a good photo of it. I changed mine and it made a big difference. A bad O2 sensor can make the idle change up and down, along with a lot of other things in the fuel system. Link to comment Share on other sites More sharing options...
shawn Posted May 5, 2011 Author Share Posted May 5, 2011 i guess my question is, since i havn't been able to find one, and aparently i need one for specifically an '86. what should i do ? :dunno: Link to comment Share on other sites More sharing options...
shawn Posted May 7, 2011 Author Share Posted May 7, 2011 ttt. Link to comment Share on other sites More sharing options...
1987Comanche Posted May 8, 2011 Share Posted May 8, 2011 It's a threaded sensor with 2 wires about 6" long and a connector, correct? If I remember my 2.5 correctly I think the sensor is identical to the renix 4.0 sensors. Is my description right? Can you post a pic of it? If it's discontinued I'd say e-bay or a post to the want ads. A CTS might work since the resistance is the same. I might have a spare 2.5 IAT in my basement come to think of it... Link to comment Share on other sites More sharing options...
shawn Posted May 8, 2011 Author Share Posted May 8, 2011 yes, thank you. i bought one today that was for a newer 2.5 and it had no leads coming from it, but it looked like the right plug (it wasn't), so i took it back and ended up finding that style of plug on my parts xj (95). so i cut the plug off and wired into the leads on my truck, then simply installed the one from my parts truck and it seemed to work but i would have to give it a few days to be able to tell. i think i will go back and buy the one from the newer 2.5 again and now it will plug-in so i will be able to try it. they also sold me an 02 sensor that doesnt have enough wires coming from it and i think i will pick-up the proper one of those while I'm there and give that a try too as i think I'm still getting idle speed changes. the scope diagnosis only pointed to the ait sensor but it couldnt hurt to change 02 as well, I'm thinking. Link to comment Share on other sites More sharing options...
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