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Old 07-31-2012, 10:18 PM   #1
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Default 99 regal ls misfire

the car has no power and is missing in #2 & #4 cylinder car has new plugs wires and coils i pulled out the plug from #2 and it was black i also smell fuel when i first start it up what could this be its a 99 buick regal 3.8 non */c has 130,000 on it
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Old 08-01-2012, 08:40 AM   #2
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Did you say you replaced all three coil packs?
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Old 08-01-2012, 09:33 AM   #3
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Do you have a scanner or a code reader? Is that how you know the misfire is on cylinders #2 and #4? Switch the 2/4 coil pack for one of the others, and see if the misfire follows the coil. While you have each coil pack off check the primary and secondary resistances.

Sounds like you have a bad coil.
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Old 08-01-2012, 01:02 PM   #4
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check for corrosion on the icm tabs when you have it off too
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Old 08-01-2012, 02:27 PM   #5
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Check injector O rings...
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Old 08-01-2012, 02:56 PM   #6
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Check injector O rings...
Injector O rings would likely give you a random misfire, or a misfire on a specific cylinder. Having a 2/4 misfire points to the 2/4 coil as the likely suspect.

Of course anything is possible, but best to eliminate the obvious first.
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Old 08-05-2012, 08:14 PM   #7
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code off scanner comes up as random cylinder misfire all coils are brand new but further test with the snap on scanner shows #2 and #4 as having a problem and when i pulled the #2 plug it was very black and all others look new still
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Old 08-06-2012, 09:31 AM   #8
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code off scanner comes up as random cylinder misfire all coils are brand new but further test with the snap on scanner shows #2 and #4 as having a problem and when i pulled the #2 plug it was very black and all others look new still

Change the #2 plug, check the spark plug wires for proper resistance and any signs of cracks, switch the 2/4 coil to a different position and see if the misfire moves. If none of that works check fuel pressure.
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Old 08-06-2012, 03:09 PM   #9
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Ditto! Also try spraying water out of a spray bottle that mists. Also a very good way to find ignition leaks.
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Old 08-06-2012, 09:18 PM   #10
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i'll try this at work when i go back on Wednesday thanks you guys
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