Big problems with Emissions/ECM 89 Firebird
The vehicle is a 89 Firebird Formula Engine is a Small block 350 TPI. The vehicle failed MD emissions, but has no check engine lights on. It passed the CO2 and pgm was very low, it failed the NO2 and was reading 3.5 pgm State Standard is 2.1. Also the primary cooling fan will not come on. It does work I have now jumped the fan and the relay. I went to Advance Auto Parts last night to run a diagnostic. The hand held scanner would not communicate with the ECM in drive mode. It did communicate with the ECM in field service mode and could read the PROM and stream data, also check air senor which indicated was working fine. It also showed the fan request on, but no fan working. It seems the ECM is not controlling the engine functions. I went home and tested the diag port by jumping the A and B turned the ignition key and gave me an error 12 code. One flash followed by two short. However when shorting the A and B the secondary fan came on in the engine which is not controlled by the ECM. What is going on??? Any advise on tracking the problem would be greatly appreciated. In addition the motor is running hot, because when I pulled the plugs they were white tipped. Sounds like the fuel mixture is to high and the ECM is not correcting problem.