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I will check the potential crack in the exhaust pipe before the O2...but I learned the O2 does not send a signal until it warms up to, say, 650 degrees. The B2 runs horribly before that. Thanks for your help, Miesk5.

I tested the IAC, TPS and ECT sensors, OK, traced black signal return wire back to ECM, OK, no breaks. Got 5 volt reference to these sensors, as well as the MAP. I read good charging voltage at battery positive and alt bracket, chassis, body, everywhere. Can not find any vacum leaks under the...

My CEL stays off. The OBD1 scan tool shows no codes. Remember, I unplug my voltage regulator, and the B2 runs perfectly, even in the first minute at cold start! My alternator charges at 14.7. I think it is detecting a load. When the B2 warms up, the load goes away and the voltage drops to 14.25...

Thanks. I'll check those.

Hello, I have 1989 Bronco II which is bucking, erratic idle, poor drivability, but only at start up. It runs and drives perfectly after it warms to operating temperature. So I need to wait 2-3 minutes on a warm day, but 7-8 minutes on a cold day. I'm not new to Fords, have a modified '96...