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Old 08-30-2010, 12:03 PM   #1
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Default Random miss-fire hot

Help anybody - have 00 SSEi that has a random missfire hot - SES light flashes in dash but not had code - just says random missfire detected. Have put new Rapidfires and A/c wires on, replaced all 3 coils and tried a new ignition module. Have it a a local shop now and they have got it to do it several times. Cly 2 & 4 dropping off and cat will smell. Bring up boost thought and it will run fine. Any thoughts or suggestions?
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Old 08-30-2010, 12:07 PM   #2
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Running good quality Premium gas? If so than might be a coil pack problem. any chance that ur plug wires are lying on the motor and possibly arching?
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Old 08-30-2010, 12:10 PM   #3
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Change your pulgs. You don't want Platinum plugs in a supercharged engine. Get a set of autolite copper plugs. They sell for around $1.30 each. That should fix the misfire problem. If your doing any mods on the engine, consider 1 range colder on the plugs.
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Old 08-30-2010, 12:19 PM   #4
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On an 00+, it is always a good idea to check the fuel pressure. FSM states it should be 48-52psi after 5-10 key on'* with engine off. I usually find the 00+ run light at around 40psi which can cause problems. Have them check O2'* as well, if they stay lean all the time, that'* bad. Although the pcm probably would have mentioned that by now.
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Old 08-30-2010, 12:44 PM   #5
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Did you replace the coils with factory replacements or did you go aftermarket with MSD'* or something like that?
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Old 08-30-2010, 01:14 PM   #6
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Used Napa coils - always run 93 or higher BP or Marathon fuel. Sometimes run 94 Sunoco. car is basically stock except K&N and syn oil
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Old 08-30-2010, 01:18 PM   #7
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Those are actually Napa branded coils or you just got them at Napa? You may want to try a set of AC Delco factory coils. I tried MSD'* for a while and got random misfires at high RPMs. These cars seem to like there factory Coils.
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Old 08-30-2010, 01:27 PM   #8
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Actually not sure - got them from NAPA - threw them on after it started missfiring - the shop has been working with me. They the an ign. mod at it and gave it back for me to drive. Ran out good for 4 days and then the day I was going back to square up it acted up twice. Has been there 2 weeks now as they drive it on and off.
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Old 08-30-2010, 02:01 PM   #9
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Napa coils are good. MSD'* are known to break down and cause issues. I'm not seeing the coils, plugs or wires as an issue.

I'd be aiming for fuel, plugged exhaust, testing ICM.
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Old 08-30-2010, 06:02 PM   #10
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What the problem with Rapid fires? I got those from my AC distributor.
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