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Old 10-13-2018, 09:41 PM   #23
Cape Codder
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Join Date: May 2010
Posts: 970
Default Re: Terriable backfiring

One test we did I failed to put forward was the fact we grounded each plug.
#4 showed a significant change in idle speed, #3 showed very little change, #2 showed a good change and #1 had NO change.

That was really the reason we have considered changing the plugs which have 6-7 thousand miles on them.
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