Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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During problem do you hear starter click?
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The most likely cause is the ignition lock cylinder. Next time problem happens check to see if it starts in neutral if so replace the park/neutral switch. If not, remove starter relay and check to see if pin 86 has power with key in start position and if pin 85 has ground with key in start position. If missing ground then the ignition lock cylinder will need to be replaced, if missing power the ignition switch will need to be replaced. If both are good then starter is likely problem and at that point you will need to monitor power going to small wire at starter. If small wire has at least 11v while trying to start but starter is not engaging then you need to replace starter. Here is a wiring diagram of system to help with testing. The 2 wires going to the ignition lock cylidner should show same resistance as key during prolem with key inserted in switch and in on/start positions if not this verifies ignition lock cylidner as problem.My goal is to provide 5 star service so make sure to let me know if you need anything. Thanks.
They key itself definitely isn't the issue as that wouldn't be intermittent. But if the two wires going to the ignition lock cylinder show different resistance then the key this proves the lock cylinder is the problem. Let me know if you have more questions, thanks.