GMC Troubleshooting Questions? Ask a Mechanic for Answers
Ih there, I am Cam. Can I get your first name please?MY first thought on this is the fuel system. Too start with, can you tell me if you have checked the fuel filter and fuel pressure?
what pressure do you get then please/
Is that with the engine running or the engine off and the pump running?
So that is a bit low, and possibly an issue. I think though your main issue is the spider assembly. With this age of vehicle and those systems being what they are, they are VERY common for issues with the injectors and leaking regulators. I would suggest you replace the spider assembly but upgrade it to the new style MPFI.
On second thought, I would put a cap and rotor on it just because first. The water test does not rule it out.
If that does not then do the spider.
The security would not make it run funny then stop, it would simply stop so I have my doubts that’s it. I would take a few minutes and check the wiring that runs down the passengers front of the back to the crankshaft sensor and see if there is any damage to wiring, loose terminals and such.
OK, after that, lets try a theft relearn.
Turn the key on and attempt to start the car, It may crank, it may start and stall or it may do nothing at all, this is fine, still cycle the key to start then release the key back to run. Wait 10 minutes with the key in run. The passlock light should be flashing and the DIC will say "Service Vehicle" or "Security" or have a picture of a car with a lock during that 10 minute span.After 10 minutes has passed, turn off the car, count to 10, and try to start it again and release the key back to run.Wait another 10 minutes.After 10 minutes, turn car off 10 seconds and try to start again and release the key to run.Wait another 10 minutes.After 10 minutes, turn car off 10 seconds and try to start again.It should start up this time. The passlock has been learned.
During this process, turn the fans off, radio off and cycle the headlights off so the battery will not go dead. If needed, use a battery charger.
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