[Markgc]

I got a scan hooked up. I found two error codes - O2 sensor saying rich mixture and low voltage from MAP sensor. The low MAP sensor voltage is most likely from diagnostic tests when I ran the engine with the electrical connector disconnected from the MAP sensor. I have cleared the codes but now I can't get the engine to start at all.

I am monitoring the ecm values in real time with the scan tool. The MAP sensor is reading 4.80V and looks about right. The TPS runs from 0.70V with throttle closed and 4.28V with the throttle fully down - this looks a little low. The O2 sensor is reading around 450mV

I cannot get the ECM to go into the Clear Flood mode which might help me start the engine, despite holding the throttle down and cranking the engine the scan tool shows the Clear Flood mode as OFF. I am not seeing any RPM reading when cranking the engine - not sure if this is a real problem or an issue with the tool not reading the serial data correctly. It would help if I could get the engine to fire up but maybe the plugs are fouled from running so rich. I am going to wire in a remote starter so that I can monitor the injector body and spark while cranking.

Does anyone have any further thoughts. I haven't seen any obvious reason fro running so rich yet. Is isn't looking like a sensor to me right now.

Mark