cruiser54 Posted March 17 Share Posted March 17 Test it. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 18 Author Share Posted March 18 The CTS sensor is good Link to comment Share on other sites More sharing options...
CheepComanche Posted March 21 Author Share Posted March 21 I found if I let off the throttle so I’m engine braking then shift it doesn’t hang. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 25 Author Share Posted March 25 I’ve tested TPS, MAT, CTS, and power steering switch. And replaced O2, ISA, and all the vacuum lines. I’ve removed my throttle cable and lubed it. While I was doing that I also sprayed intake cleaner around the throttle body to check for any manifold leaks. I can’t find anything wrong. Where do I go from here? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 25 Share Posted March 25 Did you refresh the firewall ground? at the head also? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 25 Author Share Posted March 25 I haven’t, but it was by the PO about two years ago. I really should do it myself so I know it’s good. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 25 Share Posted March 25 Yes, you should. For some reason that particular ground is especially sensitive on the 4 bangers. I'd re-do that and all the connectors and other grounds just so you know it's done. I'd even ADD a ground there in conjunction with the crappy braided one. You've read my Tips 1 through 5 right? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 25 Author Share Posted March 25 Yes, I just reread tips 1 through 5. I just took a look at my truck and wow the nut for the dipstick ground is backed way off and the wires are loosely sitting on the stud. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 25 Share Posted March 25 Hmmmmmmmmm from Tip 1: The Renix era XJs and MJs were built with an under-engineered grounding system for the engine/transmission electronics. One problem in particular involves the multiple ground connection at the engine dipstick tube stud. A poor ground here can cause a multitude of driveabililty issues, wasted time, failed emission tests, and wasted money replacing components unnecessarily. All the components listed below ground at the dipstick tube stud: Distributor Sync Sensor, TCU main ground, TCU “Shift Point Logic”, Ignition Control Module, Fuel Injectors, ECU main ground (which other engine sensors ground through, including the Oxygen sensor, Knock Sensor, Cruise Control and Transmission Sync signal. All extremely important stuff. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 25 Author Share Posted March 25 The grounds have been cleaned and tightened still no change. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 25 Share Posted March 25 big firewall and head also? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 25 Author Share Posted March 25 Yeah, it’s the original strap but it’s clean Link to comment Share on other sites More sharing options...
cruiser54 Posted March 25 Share Posted March 25 You removed it from the firewall and scraped to bare paint? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 25 Author Share Posted March 25 A wire brush was taken to it by the PO. It looks great and before reinstalling I cleaned all the contacts with electrical cleaner. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 26 Share Posted March 26 OK. At the head? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 26 Author Share Posted March 26 Same thing and I cleaned any grease away with electronic cleaner. While I was at it I cleaned the whole strap. Not that that would make a difference Link to comment Share on other sites More sharing options...
CheepComanche Posted June 5 Author Share Posted June 5 So I'm still fighting what feels like a ghost. The only sensor or ground I haven't checked is the MAP. If I rev the truck it works great. Only hangs after being under load. The issue is worst going up a hill shifting from 1st to 2nd. Very occasionally it doesn't do it at all. Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 5 Share Posted June 5 Check the ground, see what resistance exists between it and the ground at the battery. It’s interesting that you have this random rev hang on a 2.5L. Let me do some more thinking and reading on this to see if I can come up with any other probable causes. Link to comment Share on other sites More sharing options...
Ωhm Posted June 5 Share Posted June 5 How is the Closed Throttle Switch (CTS) tested? Can you use D2_13 and D2_7 for testing purposes. ECU might need to know this information for IDLE. Link to comment Share on other sites More sharing options...
CheepComanche Posted June 5 Author Share Posted June 5 I've never heard of the closed throttle switch before and I'm not experienced with using the diagnostic ports for testing. I'm not apposed to using them, I'll just need to learn how. I've been wanting to get REM for a while however its out of stock. Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 5 Share Posted June 5 The CTS is in the ISA actually, it’s a set of contacts that tell the ECU when the throttle is closed. It’s interesting how they set that one up. Link to comment Share on other sites More sharing options...
CheepComanche Posted June 5 Author Share Posted June 5 How do I go about testing that? Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 5 Share Posted June 5 I’ll have to look in my TBI book and get back to you. Since it’s a switch, you probably will be looking for continuity while closed and open with open throttle. Just a guess. Link to comment Share on other sites More sharing options...
CheepComanche Posted June 6 Author Share Posted June 6 I've seen other peoples 2.5's with a WOT switch. Mine doesn't have this, is it supposed to? Link to comment Share on other sites More sharing options...
eaglescout526 Posted June 6 Share Posted June 6 59 minutes ago, CheepComanche said: I've seen other peoples 2.5's with a WOT switch. Mine doesn't have this, is it supposed to? No. 87-90 did not have this. Only the YJ and 86 XJ and MJ had said switch. It was replaced by the power steering pressure switch as a WOT switch. Link to comment Share on other sites More sharing options...
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