rics87 Posted August 24, 2010 Share Posted August 24, 2010 Hello, I have a 1987 Comanche 5-speed manual, 2WD with 250,000mi. Was running good till a month ago. I have this problem where at 2,000rpm the engine sputters and will backfire thru the pipe.I have replaced the following ICM,PLUGS ROTOR,Cap,Wires,Map sensor,O2 sens,CPS and so far one injector. No Luck still has the problem, here's the thing tho if I just roll the throttle easy and shift before 2K I can get past it.When shifting thru the gears and when in third I'll go WOT and there is no problem only when it reaches 2k under load.AT idle giving it gas and the problem is still there. Sorry, rather long post, but can anyone suggest or has had this problem? Link to comment Share on other sites More sharing options...
dasbulliwagen Posted August 24, 2010 Share Posted August 24, 2010 Possibly throttle position sensor.... if you search I think there is a test procedure on here for it somewhere. Youve just about replaced everything else. Good luck. Link to comment Share on other sites More sharing options...
rics87 Posted August 24, 2010 Author Share Posted August 24, 2010 Yes, that's what I was thinking too. The only thing is this sensor is getting hard to find. I need to backprobe the TPS, but my cheapo voltmeter isn't cutting it. Thanks Link to comment Share on other sites More sharing options...
kastein Posted August 24, 2010 Share Posted August 24, 2010 what engine, 4.0L? You can actually use a RENIX 4.0L AT TPS anywhere you would use a RENIX 4.0L MT TPS :thumbsup: the only difference in an MT one is that it has a few wires less, just put the AT one in and tape off or ignore the extra wiring harness connector and you are golden, congrats you just saved 50+ dollars. The AT unit is actually two separate TPS units stuck together, one of them reads in one direction and tells the ECU what to do and the other reads in the other direction and tells the TCU (tranny computer) what to do. For an MT you just ignore the connector that would go to the wiring harness where the TCU is looking for it. In 1991 they did away with the duplex TPS by changing the ECU and TCU so they both understand the signal going the same direction. Link to comment Share on other sites More sharing options...
rics87 Posted August 25, 2010 Author Share Posted August 25, 2010 Yes well awreet then! Great news I will run the test to see if it's the tps. I'm what you call a shotgun mechanic. And outside of the tps and the idle air control valve i've just about replaced everything. I even have the fuel pump on standby. Oh, and my bad yes it's a 4.0 Thanks! good looking out. Link to comment Share on other sites More sharing options...
kastein Posted August 25, 2010 Share Posted August 25, 2010 No problem. I try to avoid shotgunning it but I have a decent enough collection of parts now that it doesn't cost much to try... IMO, the TPS unification is one of the few things Chrysler really got RIGHT. Simplified so much to use the same unit for both transmissions and on some years, even most engines! The 8.25 rearend and OBD II count too I guess but I'm probably in the minority on that latter one. Link to comment Share on other sites More sharing options...
rics87 Posted August 25, 2010 Author Share Posted August 25, 2010 The comanche has been in my family since new. My uncle had it then he gave it to my dad and my dad gave it to me.I also have an 84 Cherokee which I off road with, the comanche carries my bikes or my boys use it when they go dirtbikin. IT'S A JEEP THING that most people don't understand. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now