Great response, thanks. I'll answer those questions...
I didn't know that about the crank sensor. The backfires were helped out by some starting fluid sprayed into the mouth of the TB, it was -12 F. I am going to pull the codes tonite, and see what they tell me. I can also take it over to my guy with the Snapon and get a read again. I'll ask him for the full scan I guess
I haven't checked the plugs yet because I am lazy...
... but will do that soon. I did think that the next thing after all that is to replace the coilpack/ignition module (same thing, right?), then find another ECM
and try that. I'll let you know what the blinky codes are... soon. Thanks again!
Originally Posted by jr's3800
First I want to tell you there is another issue going on here... The 3800 engines will run without the Cam sensor... The cam sensor is strictly a reference for the ECM for Cylinder # 1 top dead center... You have a 1 in 6 chance of the car running crappy, if that were to happen you could shut off the car and restart and chances are it will run ok as it will be running off of a fault program... But I have never seen it cause Backfires that bad, as the ECM will still have the use of the Crank sensor... I am also courious as to what code or codes were pulled from the ECM with the Snapon... I'm thinkinh you will want to check those plugs... If that doesn't solve the problem you will want to suspect the Ignition Control Module( ICM ) or the Engine Control Module ( Cars computer ) for failure... The last time I had backfiring through the intake I replaced the ICM and got nowhere... I replaced the ECM and that solved the problem... Funny though when my ECM failed I was getting codes, 41, 42 and 43 all at the same time... Also did this happen suddenly or has this been an ongoing problem... while the codes were pulled was a full scan performed on the car to make sure all of the sensors were functioning? Let us anything you can think of..