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PostPosted: Sat Jan 24, 2009 3:11 am 
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Got the Gen V swap done........been driving it all evening.... At 1st no problems what so ever... I got on it once about 3/4 throttle after driving it about 60 or 70 miles.... and i noticed it sputtering. I plugged in my Powertuner to see what was up..... and im showing a few misfires in Cyl 3 only under boost. Idle and normal driving no misfires at all. Wtf is goen on here?

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PostPosted: Sat Jan 24, 2009 4:18 am 
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Spark Blow out. I'de try a new round of plugs with a slightly smaller gap.

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PostPosted: Sat Jan 24, 2009 8:38 am 
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also try replacing ur wires if the arent new

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PostPosted: Sat Jan 24, 2009 12:38 pm 
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Yep I had the same dam thing with mine. I put new plugs in and had issues. Put new plugs in and new wires. Fixed all my problems

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PostPosted: Sat Jan 24, 2009 1:32 pm 
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Thats exactly what came to my mind last night...... i thought my spark was getten blown out. I should probably go up to a 3.5'' pulley too..... cause ive always had a 3.4 on my Gen 3 no problems..... but its getten WAYY too much boost too quick w/ a 3.4 on the Gen V. If i slowly roll into it from any speed i get less then 1* KR...........but i punched it once from 65 and it spiked up to 11 or 12* really quick and at WOT at 120mph it was at 0*KR.....


I replaced my plugs and wires last spring.....got AC Delco wires in htere and TR6 plugs.....and i think i gapped em at .054....or .055..........what should I gap em at now?? .052 ??

Pulled the plug in Cyl #3 and the gap was at .057 :shock: Wen out and bought some AL-104's and im gunna gap em at .054 to start.

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46


Last edited by Grand Prix Fever on Sat Jan 24, 2009 8:06 pm, edited 1 time in total.
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PostPosted: Mon Feb 02, 2009 9:46 pm 
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Ironically, I was having missfires in cyl 3 when I went more than 3/4 throttle or got into boost. I replaced my plugs, wires, and coils. It was still missing in cyl 3 so i checked the injectors and cyl 3 injector was crack at the end. if the plugs/wires dont work, check the injectors.

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PostPosted: Tue Feb 03, 2009 8:00 pm 
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First step, check resistance on your plug wires, for possible issue. For factory wires, normaly resistance is around 50ohm per foot. MSD or similar would be around 30-40 ohms per foot.

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PostPosted: Fri Feb 13, 2009 8:11 am 
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Just a reminder guys

When i bought my car last Aug. I took it back coz i had a few issues with the service dept. and when they did a scan there was a miss fire on Cyl 3. They told me there was an update for the PCM. They reprogramed it and all is fine.

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PostPosted: Sat Feb 21, 2009 9:50 pm 
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So curiously, what did the problem end up being?

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PostPosted: Mon Feb 23, 2009 10:30 am 
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SMM2469 wrote:
So curiously, what did the problem end up being?


Pulled the plug in Cyl #3 and the gap was at .057 ....and the rest were at .056. And the increased boost from the Gen V was just blowing it out. Put AL-104's in there gapped at .054.......no more issues

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-2000 Grand Prix GTP 13.341 @ 102.62
-2003 Grand Prix GT (daily driver)
1991 Grand Prix GTP Getrag 284 5 speed 1 of 787 5 speeds in 91. 15.221 @ 92.46


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