Area51Werks Posted October 12, 2015 Posted October 12, 2015 Following this. I had a similar issue. Just bought the truck. Drove it cross country 1800 miles with no issues. Similar idle thing. Started truck yesterday, idled for about 30 seconds, died. Started back up fine. Driving later on the freeway 60-65 mph. Truck down shifted pulling a long hill and bogged down like loss of power, back fired, and I eased off the gas. Didn't repeat again. I have a 91 4.0 auto trans
88whitemanche Posted November 2, 2015 Author Posted November 2, 2015 What's up fellas So I haven't changed out the icm but back tracking with a friend from Cherokee forum (freegdr) and he sent me a thread about a guy having similar issues and found out that it was his o2 sensor that when it would switch from open to closed loop it would do a split second shut off then run perfect.... But I came to realize that this whole shutting off issue started after I swapped the tps even after adjusting it perfect to cruisers tips...(might be a bad tps) I had a brand new spare (off brand) and adjusted it as per cruisers tips Changed out a leaking fuel sending unit seal, Changed out the rubber gas lines Did a test run this morning and it ran flawless.... Can't say I'm excited yet but will be doing a testing this week and see how it plays out...
88whitemanche Posted November 4, 2015 Author Posted November 4, 2015 Nope not the tps...back to the drawing board... Oh and this is the link of the thread he sent me http://www.cherokeeforum.com/f2/xj-problem-I'm-about-done-jeep-215767/#post3164240
88whitemanche Posted November 5, 2015 Author Posted November 5, 2015 Ok not the best vid but you can see that my idle is jumpy...
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Well it's back at it again...but I caught a better video doing 30mph... Think that I was it was doing this at 70mph in the fast lane and coming back on by itself... Let me know if you can see the video...not sure how to post it here
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Seriously need help with this guys...can't have it on the road...it's truly unsafe
cruiser54 Posted June 26, 2016 Posted June 26, 2016 So, it is hesitating and backfiring along with the tach jumping? Could your exhaust have a restriction? We had an 86 at the dealership which had the material in the cat come apart, melt in a ball, and roll to the outlet of the converter at it's will.
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Cat has been hollowed out... The whole time the rpm gage is moving I can hear mini backfiring through the rear exhaust...
cruiser54 Posted June 26, 2016 Posted June 26, 2016 I haven't the time this morning to re-read the whole thread. Could you recap what's been done so far to address this issue?
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Tips 1-9, 23, 27 Grounds refresh added 5 new grounds, including rear tail light ground... Parts replaced- icm, coil, map sensor, 3-cps part# pc87t and did the mod to adjust it lower... New pump, filter, oxygen sensor , idle speed controller, Intake manifold bolts are tight and added new gasket... Cat is hollowed out...
cruiser54 Posted June 26, 2016 Posted June 26, 2016 I wonder if there is crap in the injector or throttle body itself. Old trick is to use a timing light aimed at the injector spray to see how it's doing.... Ever remove the ECU and refresh it's connectors?
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Don't have a timing light and don't know of anyone who has one.... Yes I guess I'll go over them again... It's weird I just drove 20miles since the video I sent and it's running good now...
cruiser54 Posted June 26, 2016 Posted June 26, 2016 Don't have a timing light and don't know of anyone who has one.... Yes I guess I'll go over them again... It's weird I just drove 20miles since the video I sent and it's running good now... Got a flashlight that strobes? You went over ECU connectors already?
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Don't have a timing light and don't know of anyone who has one.... Yes I guess I'll go over them again... It's weird I just drove 20miles since the video I sent and it's running good now... Got a flashlight that strobes? You went over ECU connectors already? Yes for the Ecu connectors and no for the strobe
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Just noticed the post above was a pic here's the vid
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 So I was cleaning my ground double checking wires today and tightening the clips/fusible links on the starter relay and questioned myself of where the wiring would go.... I realized looking through Google where the clips suppose to go on the starter relay and noticed that I had the ignition terminal where the ground was and vice versa... I switched them and tighten and wire brush everything... So let's see how the next couple of days go...
cruiser54 Posted June 26, 2016 Posted June 26, 2016 So I was cleaning my ground double checking wires today and tightening the clips/fusible links on the starter relay and questioned myself of where the wiring would go.... I realized looking through Google where the clips suppose to go on the starter relay and noticed that I had the ignition terminal where the ground was and vice versa... I switched them and tighten and wire brush everything... So let's see how the next couple of days go... You gotta be kidding.....
88whitemanche Posted June 26, 2016 Author Posted June 26, 2016 Yeah lol... Ive seen the bottom pic before but never the top pic... I rechecked everything and I had the bottom posts reversed...
88whitemanche Posted June 27, 2016 Author Posted June 27, 2016 So truck died on me this morning in my work parking lot... Had to roll it into the parking space because it cranked but no start... Didn't have time or anyone to help diagnose problem...
88whitemanche Posted June 27, 2016 Author Posted June 27, 2016 Got a chance to run out to my truck and it fired right up... Just ordered a new icm and coil... I'll check cps voltage when it's warmed up to see if it's that the problem of the current Problem of shutting off and not starting until cooled down...
cruiser54 Posted June 27, 2016 Posted June 27, 2016 Don't overlook the possibility that the relay which was wired backwards could be damaged as a result.
88whitemanche Posted June 27, 2016 Author Posted June 27, 2016 Don't overlook the possibility that the relay which was wired backwards could be damaged as a result. Ok will pick one up at my local auto parts store...
88whitemanche Posted July 1, 2016 Author Posted July 1, 2016 So...I've only changed the starter relay since the discovery of the mixed wires and shutting off... I've been driving this truck like the old scca Comanches in the slow lanes and it's been taking every pedal to the medal with ease till today...tried to shut off, rpm gauge went bonkers, limped it home and Changed out the icm and coil let's see how it goes.
88whitemanche Posted July 8, 2016 Author Posted July 8, 2016 I may have come to the conclusion that the problem may be fixed... I've been driving it/dogging it to see if it mishaps and no hesitation at all... Every little thing that would make it stutter/shut off/ wild rpm gauge has stopped... I'll keep daily driving it another week and see how it goes...
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