Car acting crazy, throwing codes P1642 and P1642
#22
Teching In
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Join Date: Aug 2008
Location: Central Jersey
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I used a multimeter to check for spark. 1.53 V from the battery,The wiring to the ICM is little different on the 96-97 models, so the colors don't match up right, but i figured it out. aroud 12V from pink wire (to ignition) on the harness going into the coil, and about 12V from the outer wires (to coil, i think) on the harness going into the ICM. I cranked it and check the other lead, It was jumping alot, but it was from 0 to 1.4, not 1-4 like shbox's website said it should be. And there is definitely a bad ground or short somewhere, the clicking/flickering has gotten worse. I couldn't even turn the key it just kept doing it and eventually it stopped so i could crank it, the seatbelt light a few other lights flash along with the lights as it clicks away. For this reason i think im gonna take it to the dealer, if it were just the opti (i prob need this too), it would def not being doing all that nonsense.
#24
TECH Regular
iTrader: (10)
Good to hear you found the problem. What brand of opti was in the car when it was causing trouble? I noticed you mentioned the previous owner replaced the opti, there are some AC Delco knock offs on Ebay that have been causing a lot of people trouble after a few hundred miles of use. They advertise them as AC Delco and they look like a Delco unit, but are not.
#25
TECH Veteran