Quote:
Originally Posted by autojoe
if I had to guess.......I would say the battery is not doing this.the extended crank yes maybe.12.3 volts Is engine off no load voltage I imagine......what is your charging voltage?after car starts it runs off your alternator.I have seen crank sensors and ignition modules do this.trouble codes are just a start if there is any.looking at scan data and understanding what you are looking at is more important than just codes.lots of times especially on older vehicles codes are not there.
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Well, I just got a job offer this morning, so I am going to pick up a battery this afternoon. You are correct. The 12.3V reading is with the car off and the car charges at 14.4V while idling.
Just to be clear, you're talking about the complete ignition control module and not just the coil pack, correct?
Also, there are two crankshaft sensors on the vehicle. A 7X sensor that installs to the engine block and a 24X sensor that installs near the crankshaft harmonic balancer. Which one is more likely to be at fault here? According to the factory service manual, after installing either of the sensors, it is necessary to perform a system variation relearn procedure which requires a scan tool. So, I'm not sure if I'd be able to do this myself because I only have a generic scan tool and not the GM Tech II scan tool.
Anyway, I'll replace the battery later today and report back if that resolves any issues.