Originally Posted by mstopkey
I installed a new ECM today. Still tries to start but won't. I will try the light bulb trick on the injector connections today. I did not see any marks on the CPS when I looked at it with magnifying glass while I had the balancer off. What about the cam position sensor? I recall when working at Pontiac dealership replaceing missing magnet in cam gear on one car but if memory serves, it would not fire at all.
It will fire without the Cam sensor or Interupter, The cam sensor is for the SFI, its used as a fuel reference pulse, for Cyl #1 TDC... Without the cam sensor or interupter it will not be able to run in SFI mode and will reduce performance and effiency..
If the cam sensor were to fail or the Interupter were to jump out leaving the ECM with a loss of cam position signal, the car will still start and run as the ECM will use the last known good Cam Sensor reference... If the battery is dissconnected( ECM will loose its memory ) the car may not run, or if it does it may be crappy..
And have you checked the fuel pressure as of yet? 37-41 Psi would be the general range for the Vin C engines...
If you have Fire, which it seems that you do, It may be time to check the fuel pressure...
Do the before mentioned Injector pluse test with the bulb and see what you get...
Let us know what you find
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