Missing on #4 plug. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-18-2010, 12:43 PM   #11
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OK, I thought I missed something.
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Old 08-18-2010, 12:45 PM   #12
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Please allow me to clarify, #4 plug did not carbon up, the reason I replaced it and thought it solved the problem was due to a very slight porcelain hairline crack on the plug (NGK TR 55) which I assume may have happened when I installed the plug. I thought the problem went away on my return trip from Florida couple months back but the problem is still there and to the same extent.
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Old 08-18-2010, 12:47 PM   #13
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I tried to edit the last thread to include, "the engine runs fine until I put it under load as in driving up a hill or max acceleration", but couldn't find the edit button.
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Old 08-18-2010, 12:56 PM   #14
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I'm still going to suggest pulling the valve cover. Had a car here a while back with a bad misfire on #6. It would idle find, drive fun, but as soon as you started getting on it there was a miss. We swapped plugs, wires, coils, ICM, injectors, did a compression test. Nothing corrected the problem and all tests came back normal. We removed the valve cover and found a broken spring on the exhaust valve.
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Old 08-18-2010, 01:53 PM   #15
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Thanks Dan and Bill, if the problem persists then I'll have to look into it further. At the moment the Bonne is driven to work by Cathy, and Mick drives it in the evening to go see submarine races.
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Old 10-12-2010, 11:55 AM   #16
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Sorry I never returned to this thread in sometime. By replacing the plug wire it seems to have gotten better. Since posting I developed a severe miss on #3 plug. This is know by way of the aeroforce scan guage. I replace #3 plug wire and it seems much better. I guess the 2 year old beldon wires are due to be changed. I should pick up a set of new wires next time I visit the ol US. of A. I think I may go with another brand next time around.
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Old 10-12-2010, 09:39 PM   #17
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A set of new OEM wires will work just as good as any other brand.
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Old 10-13-2010, 08:14 AM   #18
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Beldens while being "lifetime" (with the original receipt, box, salespersons name etc etc) don't seem to last as long as I'd like.

I've had good results from Autolite Professional and AC Delco'*.
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Old 10-13-2010, 09:11 AM   #19
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Belden warranty isn't helpfull to me in Canada therefore A/C Delco would be a good replacement. I'll have to keep an eye on for a sale....maybe States side.

Thanks Dan and Bill.
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Old 10-13-2010, 09:45 AM   #20
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If you'd like I can get a price from Ed. You remember the subframe bushings guy.
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