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Old 05-21-2008, 16:57   #1 (permalink)
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A strange misfire

Maybe I should have posted this here? I just got a strange misfire today. I had a fouled plug with my original plugs and drove it hard and that disappeared. This is a recent set of platinums that were installed. I also had a set of Accel COPs put in at the same time. Maybe have 2000 miles on everything. It doesn't throw a code yet but you can feel and hear one cylinder isn't up to snuff. It doesn't show on the vacuum guage as anything burnt like a valve. It's rather a steady reading with the idle RPM not varying more than 10 rpm either side of 580. To me it feels like something on the verge of quitting functioning. Any ideas?
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Old 05-22-2008, 06:26   #2 (permalink)
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Re: A strange misfire

i can't remember if this engine has coil packs or not but if it does i would look at that
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Old 05-22-2008, 12:35   #3 (permalink)
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Re: A strange misfire

It's got COPs but it winds up without a perceivable miss. Only feel it at idle and under accelleration. Gotta check for a vacuum leak. I installed the vacuum guage and maybe screwed something up?
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Old 05-28-2008, 14:18   #4 (permalink)
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Re: A strange misfire

I found the problem finally. It was #3 COP. I took resistance readings from the contact point spring for the spark plug to either of the input terminals. Accel is a reading of 6.3 on the 200k scale and compared to a stocker of 5.2-5.6. The third coil I replaced read 4.3 and I figured that was the culprit before I started the engine to try it. This reading confirms why it wasn't a complete misfire. I'm just still used to complete misfires from single coil setups. I'm not at all a chebie fan but the coil per cylinder setup is ez as far as troubleshooting. Thanx to all for the inputs.
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Old 09-13-2008, 20:18   #5 (permalink)
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Re: A strange misfire

i have had the same problem. when i get the code is mis-fire cylinder 1 and coil was bad i replaced it and after a year the same problem came up again today. i was wondering if anyone knows of a recall for this email me at harryrsh@insightbb.com
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Old 09-14-2008, 03:52   #6 (permalink)
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Re: A strange misfire

No recalls just bad parts. I see a lot of guys go on eBay and order a set for $80.
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