03 bonneville ssei multiple random misfire - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-03-2015, 07:58 PM   #11
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3 & 6 wouldn't cause a P0300. It would cause a P0303 and P0306 because that coil pack covers both cylinders. Are you sure you got the right code? P0300 is ALL cylinder misfire.
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Old 04-03-2015, 08:00 PM   #12
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3 & 6 wouldn't cause a P0300. It would cause a P0303 and P0306 because that coil pack covers both cylinders. Are you sure you got the right code? P0300 is ALL cylinder misfire.
Yes. P0300 multiple cylinder misfire.
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Old 04-04-2015, 04:51 PM   #13
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Yes. P0300 multiple cylinder misfire.
Now I've changed out the ICM and the IAC and still the engine is stalling after it warms up and still getting a P0300 code. I need help. I'm at a loss now. What else is there?
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Old 04-06-2015, 10:02 PM   #14
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I'm wondering if the IAC isn't closing. Engine runs fine when cold because the PCM is commanding the IAC to open, but once the engine is warm, the PCM wants to close it but its not closing, thus causing a "vacuum" leak and P0300 and stalling conditions.
I replaced the iac and problem is still there. I unplugged the crank and cam position sensors to check for corrosion but they were both clean. I plugged back in, started car and the misfires went away. Go figure. Bad connection? Intermittent sensor? And....which one? I wish I would have done one at a time.
Any suggestions? Thank you again.
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Old 04-07-2015, 05:49 AM   #15
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What is your fuel pressure when it stalls out?
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Old 04-07-2015, 09:00 AM   #16
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What is your fuel pressure when it stalls out?
Fuel pressure is good. It holds at about 50 psi even when it stalled.
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Old 04-07-2015, 06:23 PM   #17
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Disconnect your MAF sensor and see if you can get to stall again. It may run a little rough, but it should run.
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