Re: GM C3I Ignitiion

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From: hotothethismailto@hotmail.com
Date: 6/15/2006
Time: 11:20:47 PM
Remote Name: 147.202.45.202

Comments

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From: Jamie Fraser
Date: 20 Dec 2001
Time: 18:31:09
Remote Name: 24.69.255.205

Comments

Thanks Dave for the input. Unfortunately the timing chain job had already begun when you posted your message. The holder for the cam sensor magnet was cracked and the magnet was stuck to a bracket behind the timing cover. Yes, that was a problem, but as you said, not the cause of the no start. After the vehicle was back together, cam signal now present, the vehicle still exhibited the exact same symptom, it would sputter a bit and start if you feathered the gas pedal. Spark, fuel pressure and volume, and injector pulse width were all present upon cranking, so I decided to get the scanner again and have a look at the datastream KOEO to see if anything looked abnormal. Right away I noticed that the MAF sensor read 6 g/s KOEO! I unplugged it thinking that the computer may substitute a value if the signal was missing. The vehicle started up fine and ran fine. I pulled the MAF out and found it was coated with what seemed to be air filter material. I attempted to clean the wire with a qtip and some intake cleaner, and when I plugged it back in the MAF now read 0 g/s KOEO. I started the vehicle again and it now ran with the sensor plugged in....for about one minute...and then died again. Disconnecting the MAF again, it now ran well again. I have ordered the MAF from the dealer and will be arriving tomorrow. I now know with 100% certainty that this vehicle does not need a cam sensor signal to run well. I figure that the 6 g/s I was reading was due to the heat from the MAF wire transferring to the air filter material, thus slightly cooling the wire and falsely interperating that as air flow...does that sound like a correct assumption?