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Old 10-17-2009, 12:20 PM   #1
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Default Flashing "Service Engine Soon Light" when under hard acceleration

Just today I was driving my car when having to pass someone to get on the interstate I had to punch my SSEi pretty hard. I've had to do this many times and for the first time today when doing this the car started to putter or misfire. At the same time my Service Engine Soon Light blinked until I let off of the accelerator and then it stopped. Any ideas on what this might be?
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Old 10-17-2009, 12:22 PM   #2
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Flashing is a misfire. Check and change your plugs, check your plug wires, test your coils. Do you have low octane gas? Check air filter
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Old 10-17-2009, 09:05 PM   #3
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Clogged catalyst, if plugs/wires/coils don't fix it. I'd bet my left nut on it.
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Old 10-17-2009, 09:32 PM   #4
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Clogged catalyst, if plugs/wires/coils don't fix it. I'd bet my left nut on it.
Don't put the family jewels on that one. It could also be a fuel injector.
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Old 10-17-2009, 09:54 PM   #5
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thats what it was with mine injector for cylinder 4 replaced it and fixed ever since
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Old 10-17-2009, 10:04 PM   #6
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Same with mine, except on cylinder #5. I was able to determine it wasn't firing by using a mechanic'* stethoscope. Plugs, wires, coils, then injectors ... that'* the order in which I would try to diagnose a misfire.
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Old 10-22-2009, 12:18 PM   #7
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Thanks guys. I actually just changed my spark plugs and it ran fine for about 3 days and then this started happening. I'm probably asking a stupid question now, but based on the recommendation of checking the plugs/coils/cables, what could I have done that would cause this? I was always under the impression if I possibly over cranked a plug and cracked the porcelain that I would be hearing a loud pop when I'm driving, which I am not. Also, I put in the GM recommeded plugs, AC Delco, however I did not change the wires, just the plugs.

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Old 10-22-2009, 12:31 PM   #8
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There is always the possibility of a bad plug, but I would look at the wires. When were they last changed? Check wires and coils. Instructions are in this thread:
https://www.gmforum.com/t278818/
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Old 10-22-2009, 12:35 PM   #9
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It'* always possible you have a bad plug out of the box. Another possibility is do you have screw on tips on the plugs? Some times these get loose and cause a misfire.
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Old 10-22-2009, 12:46 PM   #10
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"Clogged catalyst, if plugs/wires/coils don't fix it. I'd bet my left nut on it."




LOLOL!!! Im a little disturbed wit how quickly this cat offered up his left nut.LOLOLOL!!! Hilarious bro!
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