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My '89 245DL has been pulling up code 2-3-4 (Throttle Position Switch (TPS) idle signal faulty, Faulty wiring or TPS; TPS adjusted incorrectly, Poor hot starting; poor idling; limp-home operation), and is in limp-home mode. It was fine this morning. I followed the directions for adjusting the TPS in the Haynes manual. Any ideas?
I put a new throttle switch in a few days ago and it was running pretty good, still rough starting but after a few minutes it would settle down and idle nicely. I was thinking this was from the ancient (original) O2 sensor.
I have been having a starting and idling problem for the last couple of months. I've also put in recently, idle control valve, and a used AMM that tested good, as well as alot of new hosing, new air box filter and temp sensor. I also have a new O2 sensor to put in, the original is still in the car with 230K miles on it!
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Andy - 1989, 245DL Automatic Wagon, 225k miles, Branford, Connecticut
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