How much did I advance the TPS? I used some white-out (just because that's what I had on hand) to "scribe" a line across the TPS and the throttle body so I could get back to the starting point if need be. White-out goes on with a small brush, so it was a fairly wide scribe line, not narrow like a sharp pencil would make. Then I advanced it perhaps twice the width of the line. I found the shift points occurred at significantly higher RPM, and were harsher shifts, but no flare. Then I backed off a little at a time, driving it a day or two for each adjustment, until the shifts were more reasonable and not harsh. I wound up with pretty normal shifts, and just the hint of flare once in a while under very gentle acceleration.
If you retard the TPS too much it will turn on the check-engine light. If you advance it too much, It might also turn on the CEL -- I don't know, it happened to me only when retarding.
When my car is started cold, it stays at a fast idle longer than it should even after warmed up, though it eventually drops to a proper idle. I don't KNOW that that is caused by the out-of-spec TPS, or whether I have some other problem. I suspect the TPS, but when restarted warm it is fine, so when it annoys me I just shut it off for a second and restart. Usually I do the restart while driving along at 30 or 40 MPH -- just leave it in gear, switch off the ignition and switch it back on, and it restarts without cranking the starter.
Good luck trying your new TPS. Please report back whether it helps you or not, and whether you experience any fast-idle problems.
Wednesday, February 5th, 2014 AT 7:10 PM