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Spark plug - cylinder 6

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Old Apr 20, 2025 | 09:05 AM
  #1  
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Default Spark plug - cylinder 6

Hey,

I thought to shove a bore scope into cylinder 6 on my .1 3.6 with 138k miles. No issues with scoring or anything like that, but what does



the 35k miles plug in the cylinder tell you? Lean mixture or normal?
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Old Apr 20, 2025 | 09:47 AM
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Normal Burn



Here are mine fromm a few weeks ago: (2007 C4 3.6L @ 25K)


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Old Apr 20, 2025 | 10:01 AM
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Plug looks good to me with minimal but even electrode wear. The light tan deposits on the plug are what you want to see.
Seems like you've got a very healthy motor at 138K miles. Just my two cents, but I'm sure others will chime in.
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Old Apr 20, 2025 | 10:18 AM
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Pretty good looking for a healthy motor (assuming the other plugs all look like that). Do consider changing the plugs at 30K miles ... no matter what the book says.
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Old Apr 20, 2025 | 03:26 PM
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Just curious.....how did you go about pulling them?

Did you wriggle & squirm or did you pull stuff off to get at them?

TIA
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Old Apr 20, 2025 | 03:44 PM
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Originally Posted by RandyVW
Just curious.....how did you go about pulling them?

Did you wriggle & squirm or did you pull stuff off to get at them?

TIA
It’s reasonably straightforward - remove the rear wheel, heat shield, coil pack and use an extended spark plug removal tool. Done. There's not much space there though, so I imagine 5 and 4 spark plugs could be a bit fiddly. I'm not sure whether it would be easier on ramps, bumper removal - regardless, it is quite an involved job.
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Old Apr 20, 2025 | 05:02 PM
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Number 6 is the ...easiest one. Try number 4 if you want a challenge.
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Old Apr 20, 2025 | 06:46 PM
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Originally Posted by yelcab
Number 6 is the ...easiest one. Try number 4 if you want a challenge.
This!!!!!!
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Old Apr 20, 2025 | 08:13 PM
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And I didn't pay attention I was looking at @Graufuchs pics and thought you had pulled all 6 plugs but you just pulled #6.

I've seen the videos of trying to pull all without pulling the whole rear of the car apart and it looks like a party for sure!
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Old Apr 21, 2025 | 09:51 AM
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Originally Posted by RandyVW
And I didn't pay attention I was looking at @Graufuchs pics and thought you had pulled all 6 plugs but you just pulled #6.

I've seen the videos of trying to pull all without pulling the whole rear of the car apart and it looks like a party for sure!
Sorry for the confusion....I pull the mufflers, rear bumper and heat shielding (sides) from the rear of the car to do coil packs and plugs. (996 and 997s)

It also gives you a better idea of overall condition of components and the ability to wipe down and clean up areas.

Not looking to become a contortionist at 45yrs old, I get hurt laying down to go to sleep now.
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Old Apr 21, 2025 | 10:33 AM
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I pulled the bumper and exhaust to do spark plugs, ignition coils, and bores coping now. The time it takes is the same and the aggravation is 10 times less.
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Old Apr 21, 2025 | 10:34 AM
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Originally Posted by punchdrunked
Hey,

I thought to shove a bore scope into cylinder 6 on my .1 3.6 with 138k miles. No issues with scoring or anything like that, but what does



the 35k miles plug in the cylinder tell you? Lean mixture or normal?
This looks totally fine and what it should look like.
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Old Apr 21, 2025 | 10:35 AM
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Originally Posted by Graufuchs
Normal Burn



Here are mine fromm a few weeks ago: (2007 C4 3.6L @ 25K)

Something may be going on with your #3
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Old Apr 21, 2025 | 11:13 AM
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** see next message **

Last edited by JustinCase; Apr 21, 2025 at 11:16 AM. Reason: bad upload
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Old Apr 21, 2025 | 11:15 AM
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This is what a #6 spark plug looks like with bore score at roughly 3,000 to 5,000 miles on it. Yours looks fine.


Last edited by JustinCase; Apr 21, 2025 at 11:18 AM.
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