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#1
01-22-2009, 01:27 AM
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Coil on Plug Insulator Boots
I just changed the valve cover gaskets on my 2001 LS V-8 3.9Lwith 80k. The plug wells were full of oil as expected. The COP boots were oil soaked and spongie.
No parts store within 50 miles stocked Coil on plug boots! I had NAPA order the boots for me since they had the best price at $5.76ea. It took them 2days to get them which wasn't bad. The Part Number for the COP Boots is: NGK CPB-FD004, NAPA # 58926 just in case someone is looking for replacement boots. These NGK boots are identical to the stock ones I replaced.... Last edited by windryder; 01-22-2009 at 10:46 PM. 
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#2
01-22-2009, 07:46 AM
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Re: Coil on Plug Insulator Boots
Good info. Did you have any misfiring prior to replacing the valve cover gaskets? If so, after a few trips with the engine at temperature, are you confident the new boots fixed the misfire?
-Rod
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#3
01-22-2009, 04:26 PM
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Re: Coil on Plug Insulator Boots
Yes it had a bad misfire. Car would shake at idle, and sputter. I also changed the spark plugs when I had the valve covers off.
Since I couldn't get the boots right away I used the old boots. The misfire was worse. As soon as I installed the new boots the misfire was gone... I read online that 50% or more of the coils returned are not bad. I believe that most of the problem is with the oil soaked boots, which were not available without buying the complete coil until lately.. P.S. I had put the NAPA part # for the boots not the NGK! I changed the numbers in the 1st post, so now they are right! Sorry bout that..... Last edited by windryder; 01-22-2009 at 10:48 PM.
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