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Kontakt · 04-02-2011, 06:01 PM

Ok, this problem has been resolved, but the reason I re-wired the TPS is still there.

Turns out the TPS ref voltage (brown wire) also feeds the AFM ref voltage, so I had eliminated my AFM... Added that to the splice and the car is now exactly as it used to be (driveable).

The problem now, is that it still occasionally stumbles for no apparent reason, and then suddenly brings itself back.

It always gets down the road, but sometimes it really is limping. Idles fine. TPS works fine (I have 3 of them, they all work fine).

I believe that the problem is still electrical (otherwise, how would poking the wiring harness with a stick fix it when it stumbles), but I don't know at this point.

I will leave my DVM hooked up to the primary injector (one at a time of course) pin on the ECU as I drive around to see if it goes nutty when the car goes nutty. Hopefully that gives me a clue before I go ahead and pull the UIM to re-wire my primaries.

Edit: FWIW it did this before I rebuilt my engine as well. My injectors have been cleaned and flow tested.

04-02-2011, 06:01 PM	#5
Kontakt GTA Bryson City Join Date: Feb 2008 Location: Asheville, NC Posts: 74 Rep Power: 18	Ok, this problem has been resolved, but the reason I re-wired the TPS is still there. Turns out the TPS ref voltage (brown wire) also feeds the AFM ref voltage, so I had eliminated my AFM... Added that to the splice and the car is now exactly as it used to be (driveable). The problem now, is that it still occasionally stumbles for no apparent reason, and then suddenly brings itself back. It always gets down the road, but sometimes it really is limping. Idles fine. TPS works fine (I have 3 of them, they all work fine). I believe that the problem is still electrical (otherwise, how would poking the wiring harness with a stick fix it when it stumbles), but I don't know at this point. I will leave my DVM hooked up to the primary injector (one at a time of course) pin on the ECU as I drive around to see if it goes nutty when the car goes nutty. Hopefully that gives me a clue before I go ahead and pull the UIM to re-wire my primaries. Edit: FWIW it did this before I rebuilt my engine as well. My injectors have been cleaned and flow tested. Last edited by Kontakt; 04-02-2011 at 06:04 PM.