eaglescout526 Posted March 8 Share Posted March 8 You dont have AC do you? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 8 Author Share Posted March 8 no, I don't Link to comment Share on other sites More sharing options...
CheepComanche Posted March 12 Author Share Posted March 12 It hangs the worst between 1st and 2nd. It also gets much worse going up hill. Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 12 Share Posted March 12 Unplug the power steering pressure switch. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 12 Author Share Posted March 12 Unplugging it made it hang worse but nothing else changed. At least we have a little more information now Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 12 Share Posted March 12 Interesting….that rules out the power steering switch from being bad. You don’t have an REM do you? Link to comment Share on other sites More sharing options...
CheepComanche Posted March 13 Author Share Posted March 13 no, I’ve really wanted to get it but it’s been on backorder Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 13 Share Posted March 13 Damn. I’m curious as to what the read out would be. Well drive it without the ISA plugged in and hopefully we can solve the issue. I’ll rack my brain and think what else would cause this before looking at the ECU. So let’s see MAP is fine TPS adjusted? ISA rebuilt and replaced Power steering switch operating Vac lines, inspected manifold bolts, tight O2? That leaves the MAT and the CTS on the manifold. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 13 Share Posted March 13 MAT and CTS can be tested with a meter. Firewall ground all refreshed? Link to comment Share on other sites More sharing options...
Ωhm Posted March 13 Share Posted March 13 Cruise Control maybe, if equipped ????? Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 13 Share Posted March 13 2 hours ago, Ωhm said: Cruise Control maybe, if equipped ????? That would rev it out unless the cable from the servo is caught. That’s a good one Ωhm. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 13 Share Posted March 13 Always good to consider mechanical issues as a possibility!! Link to comment Share on other sites More sharing options...
CheepComanche Posted March 13 Author Share Posted March 13 I don’t have cruise so think the most likely possibility is the mat sensor because the problem isn’t quite as bad in warmer weather Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 13 Share Posted March 13 Could be it. ECU could be getting false readings and the high rev would be to help warm it up to go into closed loop. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 14 Share Posted March 14 1 hour ago, CheepComanche said: I don’t have cruise so think the most likely possibility is the mat sensor because the problem isn’t quite as bad in warmer weather Can be tested!! Link to comment Share on other sites More sharing options...
CheepComanche Posted March 14 Author Share Posted March 14 I backprobed the mat sensor with the engine running but no matter how much I tried, all I would get was 0 ohms. Could this mean the sensor is bad? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 14 Share Posted March 14 Unplug it and check the ohms to ground. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 16 Author Share Posted March 16 So I have removed the mat sensor and got an ohm reading. It does seem to be working but it responds to temperature change super slowly. After a few minutes in the freezer it barely got to 6000 ohms. Is it supposed to be slow? Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 16 Share Posted March 16 It should be pretty instant and responsive to temp change. Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16 Share Posted March 16 I wouldn't think it would be that slow. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 16 Author Share Posted March 16 I cleaned it with MAF cleaner and that didn’t make any difference. If I need to get a new sensor, where can I get one? Link to comment Share on other sites More sharing options...
eaglescout526 Posted March 16 Share Posted March 16 I’ve got some. I’d have to test them first. FYI. They can’t really be had new but there’s a GM one that’s close that would do but you’d have to modify the wiring. Link to comment Share on other sites More sharing options...
CheepComanche Posted March 16 Author Share Posted March 16 So tested my sensor again today and it’s working perfectly. Do they just need to stay clean? If so how clean should it be? Link to comment Share on other sites More sharing options...
cruiser54 Posted March 16 Share Posted March 16 Link to comment Share on other sites More sharing options...
CheepComanche Posted March 17 Author Share Posted March 17 I cleaned it with a whole can of maf cleaner and couldn’t get it any cleaner. I figured it was responded to temp fine so I reinstalled it. Now I’m only left with the coolant temp sensor as a possible problem Link to comment Share on other sites More sharing options...
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