BLOZ UP Posted January 11, 2011 Share Posted January 11, 2011 (edited) '92 TT, having misfiring issues while driving (only). It's exhibiting Series 1 PTU failure symptoms--but it has the service campaign PTU, the series 2. Multiple cylinder misfires, or complete loss of all cylinders during driving. Way more prominent when you get on it. Checking the harness and alarm as well. Anyone have a series 2 fail? Edited January 11, 2011 by BLOZ UP Quote Link to comment Share on other sites More sharing options...
NCchris Posted January 11, 2011 Share Posted January 11, 2011 I was having similar problems with my 93 NA and fixed most of it by cleaning the PTU wiring harness plugs/contacts. I also eliminated 2 of the plugs by splicing and soldering the wires when I relocated my PTU under the nose where the old airbox used to be. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted January 13, 2011 Author Share Posted January 13, 2011 (edited) Cleaned it and reinstalled. Symptoms went away for a day, then out of the blue it died completely while cruising. Had to cycle the key to get it to restart. Died again further on the way home, cycled and it came back. Then sputtered the rest of the mile back home. Wondering if it may be the harness or something. Will see if I can get another PTU to test tomorrow. Edited January 13, 2011 by BLOZ UP Quote Link to comment Share on other sites More sharing options...
hoov100 Posted January 13, 2011 Share Posted January 13, 2011 Theres actually three series of PTU's, the series 2 ones do fail but are not as common and the series 3 ones I have yet to have or see one fail. I've got a PTU harness and a series 3 PTU I'll let you borrow if you pay shipping. Quote Link to comment Share on other sites More sharing options...
Jehannum Posted January 14, 2011 Share Posted January 14, 2011 Have you bypassed the recall subharness? The connector on the harness side is not sealed, and will show heavy, heavy corrosion. I bypassed the subharness (spliced the new harness terminations into the main EFI harness), and had no more misfires. I also relocated the PTU into the footwell near the ECU, but that's probably a little beyond the scope of your current issue. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted January 14, 2011 Author Share Posted January 14, 2011 (edited) Have you bypassed the recall subharness? The connector on the harness side is not sealed, and will show heavy, heavy corrosion. I bypassed the subharness (spliced the new harness terminations into the main EFI harness), and had no more misfires. I also relocated the PTU into the footwell near the ECU, but that's probably a little beyond the scope of your current issue. No I haven't. I just checked the PTU plugs and one of the two plugs on the harness side. After I posted I checked the other one, full of corrosion, like you said. I've cleaned it up, but haven't had time to test. I have a good feeling about it, though. Tons of corrosion. Edited January 14, 2011 by BLOZ UP Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted January 20, 2011 Author Share Posted January 20, 2011 (edited) Well, I found the problem. It was a combination of one of the the PTU harness connectors, and the CTS connector. I've eliminated that PTU subharness connectors like someone above mentioned, and will go to the Z yard to try and grab a CTS connector. The CTS does not look so bad corrosion wise, but the female terminals have spread open and aren't making good contact. Depending on how you whack the harness the car will run/miss/stall, and I was confusing it with the PTU harness. So, problem solved. Edited January 20, 2011 by BLOZ UP Quote Link to comment Share on other sites More sharing options...
hoov100 Posted January 20, 2011 Share Posted January 20, 2011 Try taking a pick or something and bending the little ears of the connector pins inward to create a better and more secure connection, Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted January 20, 2011 Author Share Posted January 20, 2011 Try taking a pick or something and bending the little ears of the connector pins inward to create a better and more secure connection, Tried. Plastic crumbled, just getting another connector instead. Quote Link to comment Share on other sites More sharing options...
Jehannum Posted January 20, 2011 Share Posted January 20, 2011 If you don't mind shaving the keyway on the sensor, you can swap the CTS connector for one off of the Z31 fuel injector recall harness. They're sealed on the back, so no more corrosion issues after you replace it. Quote Link to comment Share on other sites More sharing options...
BLOZ UP Posted January 22, 2011 Author Share Posted January 22, 2011 I went ahead and did just that actually. The CAS also had a bad connection. So, it was a combination of PTU, CTS, and CAS. At least the CTS for the instrument panel seems to be working. Basically it was everything I disconnected to do the timing belt. Go figure. Quote Link to comment Share on other sites More sharing options...
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