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91 740 turbo ecu failure? 700

posted by  johnboy740 on  Wed Nov 26 12:48 CST 2008
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last visit: Thu Apr 12 13:04 CST 2012
[RELATED]

I am going through the EXACT same problem. Just when I think I found it and fixed it, it pops back up. Just tonight I was coming home from getting dinner and it happened. With the gas fully depressed, the car surges and falls repeatedly and back fires a little too. I haven't tried it yet, but in a post that I made on the subject, someone suggested unplugging the O2 sensor. The idea is that either the ecu, or the sensor is going bad, and causing a lean condition. By unplugging the sensor, the ECU should be tricked into causing a rich condition, suggesting that the O2 sensor is going. If the condition continues, then suspect the ECU. Please post your findings, and I will make sure to do the same. John






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