Spark plug issues
Fleet Owner
Joined: Aug 2010
Posts: 21,254
Likes: 1,656
From: Reynoldsburg, Ohio
Is that plug before it was replaced? Looks to be tons of carbon on the bottom threads, naturally the electrode and grounding strap are missing too.
An ill fitting chassis wiring connector to the COP could be the cause of this, perhaps an issue with the #7's wiring circuit path back to the PCM?
An ill fitting chassis wiring connector to the COP could be the cause of this, perhaps an issue with the #7's wiring circuit path back to the PCM?
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New User
Joined: May 2022
Posts: 4
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it's an 06 and yes it has had a helicoil put in and it was fine mechanics said it's still in good shape!
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Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,082
From: St Louis
I'd disagree with the mechanic's assessment that it's "in good shape".
It sounds more like the plug is unable to properly seal and that cylinder is sucking excess air and is having blow-by. This causes greatly elevated combustion temps and results in burned plugs. Could also be a valve or piston got dinged during the "repair". A compression test of that cylinder would be useful to rule out this possibility.
I'd recommend removing the "helicoil" and installing either a Timesert or CalVan/Snapon or Lock'n'Stitch insert.
It sounds more like the plug is unable to properly seal and that cylinder is sucking excess air and is having blow-by. This causes greatly elevated combustion temps and results in burned plugs. Could also be a valve or piston got dinged during the "repair". A compression test of that cylinder would be useful to rule out this possibility.
I'd recommend removing the "helicoil" and installing either a Timesert or CalVan/Snapon or Lock'n'Stitch insert.
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Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
Timesert has Big-Sert Oversized inserts to fix helicoil repairs.
How many miles are on the helicoil repair?
Give them a call and see what they say.
Fleet Owner
Joined: Aug 2010
Posts: 21,254
Likes: 1,656
From: Reynoldsburg, Ohio
Generally I'd agree especially since there are a few much, much better alternatives to an ejected spark plug thread repair.
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