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1999 Pontiac grand Prix 3800 engine-dies when warm, starts and idles fine when cold,after 10 minutes, it dies. I have replaced the ECM, 2 coil Packs, both o2 sensors, fuel filter, fuel pump, plugs and wires, IAC, TPS. Pulled the pre-cat O2 and it still would not run when warm.
Sounds like an odd problem. I’ve never seen a vehicle where the injectors just stop working all of a sudden. Are you sure that’s the problem? Maybe have your mechanic do an injector balance test or flow test. If it’s something that is affecting all six injectors, then I would say it’s a wiring problem or PCM issue. Hard to say without actually seeing a scanner with the car running.
Is the pcm the same as the ecu? and if it is, say i were to buy a new ecu can I install this myself or would the dealer need to install it
Yes, PCM and ECU are the same thing….dealer would have to program it and install it. I would recommend only using GM parts!
Need a little more information here! Is the security light on or flashing? Check engine light? Does it do the same thing every time? When did the problem start? Any work done prior to the problem happening?
You need to find out what is missing when it will not run. Just guessing at parts will get expensive, as you now know. Are you loosing spark, fuel pressure, fuel injector pulse, etc. If you do not have the tools to check these things, you may have to take it to a mechanic. Right off the top- an oxygen sensor will not cause your Pontiac to stall and not start. You may have a bad CRANK sensor. They are known for failing when hot, but that is just a guess without knowing the things mentioned above.
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