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I have a random misfire code. at one point in time it designated no.6.
1999 Buick Park Avenue

I have a random misfire code. At one point in time it designated no.6.

(1999 Buick Park Avenue)
It is not constant, doesn't do it all the time. Would it be wise to replace the coil operating the no.6 piston?
1 answer & 2 comments
Popular Answer
on January 03, 2015
Hello ParkAve_Jim here, Have experienced the same issue in the past. I would recommend you remove "ALL" the coils and clean up the contacts on the bottom as they are prone to become oxidized and corroded from road salts and winter chemical treatments that find their way under them. Be careful when removing the spark plug wires from the coils and inspect them when you have them out too. The coil contacts are prone to be oxidized and corroded if the boot has failed. Replace and reseat the coils after cleaning up the contacts and see if you experience the misfire. If you still experience the random misfire, try swapping the #6 coil pack with the #1 coil pack and see if the skip moves with the pack. If it does after cleaning up "ALL" the electrical contacts on the bottom, the coil pack is probably breaking down inside or has a crack in it causing it to fail. Also, how are your plug wires? You can check them at night with the engine running, no lights on and watch for arcing from the wires to the engine block. Don't touch the plug wires while running unless you have high voltage gloves on. Could knock you on the ground. Good luck.
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on January 07, 2015
Thanks Jim, I replaced the coil that runs no. 3 and 6 cylanders, installed new spark plug wires, and new spark plugs. Reset the engine light, now I'm getting no codes and the car has fantastic power, its a supercharged Ultra with only 130,000 on it. Problem solved.
on January 07, 2015
That's good to hear. Mine is a Supercharged Ultra too with 148K and yes for a V-6 they do have some get up and go!! This is my third Park Ave. in this vintage. You just can't kill the 3.8L V-6's. Go Buick!!
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on January 03, 2015
Hello ParkAve_Jim here, Have experienced the same issue in the past. I would recommend you remove "ALL" the coils and clean up the contacts on the bottom as they are prone to become oxidized and corroded from road salts and winter chemical treatments that find their way under them. Be careful when removing the spark plug wires from the coils and inspect them when you have them out too. The coil contacts are prone to be oxidized and corroded if the boot has failed. Replace and reseat the coils after cleaning up the contacts and see if you experience the misfire. If you still experience the random misfire, try swapping the #6 coil pack with the #1 coil pack and see if the skip moves with the pack. If it does after cleaning up "ALL" the electrical contacts on the bottom, the coil pack is probably breaking down inside or has a crack in it causing it to fail. Also, how are your plug wires? You can check them at night with the engine running, no lights on and watch for arcing from the wires to the engine block. Don't touch the plug wires while running unless you have high voltage gloves on. Could knock you on the ground. Good luck.
Sign in to reply
on January 07, 2015
Thanks Jim, I replaced the coil that runs no. 3 and 6 cylanders, installed new spark plug wires, and new spark plugs. Reset the engine light, now I'm getting no codes and the car has fantastic power, its a supercharged Ultra with only 130,000 on it. Problem solved.
on January 07, 2015
That's good to hear. Mine is a Supercharged Ultra too with 148K and yes for a V-6 they do have some get up and go!! This is my third Park Ave. in this vintage. You just can't kill the 3.8L V-6's. Go Buick!!

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