Asked by Dec 08, 2013 at 10:27 AM about the 1991 Pontiac Sunbird 2 Dr STD Coupe

Question type: Maintenance & Repair

1991 sunbird has no spark at coil, fuel pump runs and injector pulses, replaced the coil and ignition module. jumped diag connector and code 42 comes up. was going to try the pick-up coil in distributor next. Any other ideas?

3 Answers


Code 42 is Electronic Spark Timing Failure. Make sure the connectors at the distributor are clean and tight. Also the MAP and coolant temperature sensors are involved. Check their connections as well. Check the vacuum hose going to the MAP sensor. Be sure it's not kinked, damaged or broken. HTH. -Jim


Thank you for your reply. I will check those 2 things, but would a kinked MAP hose or a faulty ECT cause the vehicle to have no spark at all, I would think the vehicle would still start with those 2 problems, or at the very least have spark from the coil.

1 out of 1 people think this is helpful.

It probably would start with the kinked vacuum hose and faulty ECT but if the wiring for those sensors is damaged or shorted it may not. HTH. -Jim

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