legacycentral bbs

My car is backfiring at every shift over 3,000RPM and throwing a code 42 all of the time. Testing the throttle position sensor showed it was bad, and I removed it entirely to drive over to the junkyard to get a new (used) TPS. Strangely enough, the backfiring went away completely and the car ran great *without* the TPS.

The new TPS checked out fine, giving resistance from zero to infinity, and I adjusted it to read zero resistance at idle and infinity when the throttle was barely hit.

The strange thing is: the 42 code is still there and the backfiring is back! WTF! Its odd that no sensor is better than a working sensor.

Did you check the TPS wiring to the ECU to make sure it's good?

Legacy777 wrote:Did you check the TPS wiring to the ECU to make sure it's good?

Hell, that was obvious, even for me No, I didn't check, but will this weekend.

After I posted I checked the oxygen sensor and that appeared to be way off of spec, putting out .01 volts instead of .1.2 volts.

Thanks!