15,000 miles and spark plug carbon closed gap??!!
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Joined: Apr 2006
Posts: 25,432
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From: Ontario
Re: 15,000 miles and spark plug carbon closed gap??!!
Originally Posted by blwnstang02
Well a couple thousand miles after the last plug change, i pulled the plugs from the same cylinder and show signs of what they looked like before. I am going to replace the two plugs, and coil pack. I am going to run fuel injector cleaner through it as well. If this does not cure the problem i will be looking at replacing the injector. Then the valve cover is coming off to replace the lifters and possibly the valve guides/seals. Something is going on in that cylinder. Not sure what yet. Going to start working on in this friday. Also the car has developed a tick it sounds like right above that cylinder. This is why i may replace the lifters. I cant belive with 17,000 miles i am dealing with these issues.
There maybe a leak of oil across the cylinder head gasket if oil passes through the gasket. I've never seen a head off though.
Last edited by onehundred80; Sep 21, 2011 at 09:17 PM.
Senior Member
Joined: Apr 2010
Posts: 2,404
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From: Mendocino, CA
Re: 15,000 miles and spark plug carbon closed gap??!!
Originally Posted by blwnstang02
Well a couple thousand miles after the last plug change, i pulled the plugs from the same cylinder and show signs of what they looked like before. I am going to replace the two plugs, and coil pack. I am going to run fuel injector cleaner through it as well. If this does not cure the problem i will be looking at replacing the injector. Then the valve cover is coming off to replace the lifters and possibly the valve guides/seals. Something is going on in that cylinder. Not sure what yet. Going to start working on in this friday. Also the car has developed a tick it sounds like right above that cylinder. This is why i may replace the lifters. I cant belive with 17,000 miles i am dealing with these issues.
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Joined: Apr 2008
Posts: 2,665
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From: Orlando, FL
Re: 15,000 miles and spark plug carbon closed gap??!!
Sounds like it may be time also for a Euorcharged tune to lean it out some. The cars come from the factory rich. Just a thought....Good luck! 
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From: TN
Re: 15,000 miles and spark plug carbon closed gap??!!
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Joined: Dec 2010
Posts: 12,780
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From: Lineville, AL
Re: 15,000 miles and spark plug carbon closed gap??!!
I would have swapped the coil pack to the front and put 2 new plugs in the back.
( Front is easier to get to the plugs ), then run a couple of thousand miles and checked both front and back plugs.
If fouling still occurring, it is NOT electrical ( unless for some strange reason the PCM has a burned out transistor for that coil pack ).
Compression test time .....
180's probably right - broken ring.
( Front is easier to get to the plugs ), then run a couple of thousand miles and checked both front and back plugs.
If fouling still occurring, it is NOT electrical ( unless for some strange reason the PCM has a burned out transistor for that coil pack ).
Compression test time .....
180's probably right - broken ring.
Thread Starter
Joined: Apr 2011
Posts: 102
Likes: 0
From: Olathe, KS
I would have swapped the coil pack to the front and put 2 new plugs in the back.
( Front is easier to get to the plugs ), then run a couple of thousand miles and checked both front and back plugs.
If fouling still occurring, it is NOT electrical ( unless for some strange reason the PCM has a burned out transistor for that coil pack ).
Compression test time .....
180's probably right - broken ring.
( Front is easier to get to the plugs ), then run a couple of thousand miles and checked both front and back plugs.
If fouling still occurring, it is NOT electrical ( unless for some strange reason the PCM has a burned out transistor for that coil pack ).
Compression test time .....
180's probably right - broken ring.
Joined: Apr 2009
Posts: 20
Likes: 0
Re: 15,000 miles and spark plug carbon closed gap??!!
I have been going through the same thing with my 05. 3rd owner bought with 18k.
Drove my crazy...finally figured out #6 cylinder would foul over both plugs. I've swapped coils, injectors, put on new wires...For now I'll feed the habit. This winter I will also pull the valve cover and see what things look lie. I expect valve seals.
With new plugs the car rips up the road no misfires, etc..
Keep all posted last this winter.
Drove my crazy...finally figured out #6 cylinder would foul over both plugs. I've swapped coils, injectors, put on new wires...For now I'll feed the habit. This winter I will also pull the valve cover and see what things look lie. I expect valve seals.
With new plugs the car rips up the road no misfires, etc..
Keep all posted last this winter.
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