What are the best plugs to use on a 3800 (non SC) - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-24-2004, 11:32 PM   #1
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Default What are the best plugs to use on a 3800 (non SC)

I recently replaced my plugs and wires to correct some bucking and snorting symtoms on my 96 Bonneville.

What I notice now is that it still misfires a little when I put a small load on the engine after the TC locks up at around 50 miles per hour. Now it is miles better than it was
before the plug and wire replacement but it still misfires a little.

The plugs I used were Bosch super plugs. These look like conventional plugs, (they don't have the extra electrodes)

Is anyone else running these plugs or have you had problems with them? Are the AC plugs better suited for this engine?

Any help would be appreciated.
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Andy
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Old 05-25-2004, 12:56 AM   #2
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i've heard of a number of people having issues w/ bosch plugs causing rough idles or acceleration. I think a safer bet are NGK'* or good ol' AC Delco'*.
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Old 05-25-2004, 02:30 AM   #3
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Yup. General concensus is that the 3800 and Bosch don't get along. I've got AC Delcos and cheapo NASCAR Select wires, and she runs great.
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Old 05-25-2004, 05:15 AM   #4
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The AC Delco'* work great, but if you don't mind spending alittle bit more money, I would suggest going with the NGK'* along with some Taylor or MSD wires.
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Old 05-25-2004, 09:22 AM   #5
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My 99 is now doing the same thing. I've got the Bosch Platinum +4s. I'll be returning those this weekend for the AC Delco plugs.
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Old 05-25-2004, 05:46 PM   #6
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My 96 seems to run fine with new wires and Bosch coppers...
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Old 05-30-2004, 06:44 PM   #7
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The only time my Bonneville seems to miss, is when it is in overdrive and the torque converter is locked up running around 50 mph. Other than that it runs great and gets good mileage.

I think I will go with either the NGK'* or just the plain old AC Delco'* and see what kind of a difference that makes.

Thanks for all of your replies

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