Dead Cylinder
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
The reason I asked, I should have explained earlier. It may seem obvious but a flat black plug is a carbon foul from a rich condition. A glossy dark black is an oil foul and indicates oil in the cylinder. If the plug is glossy black and smells like gas it is a judgement, a miss will of course leave the plug wet with gas, that gas has a tendancy to clean off the plug. If the plug still apears glossy dark black after the gas has evaperated off. I would sermise that there is oil in the cylinder. This combined with the loss of crompression indicates that oil is being sucked up past the rings on the intake stroke. Telling us two things, the intake valve is working fine, and the rings aren't sealing.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
Well yes and no, with it creating very little compression, its not creating much vacuum either. Not enough to pull up a bunch of oil, and no comression to help burn it.
Its probably just pulling/pushing a little through, enough to get the plug wet maybe.
If it where me I'd still take a minute to pull the valve cover and check over the valve train to that cylinder.
It could still be just a bent or broken part, seen it many times before. Like a cracked rocker arm, still working but barely.
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Posting Guru
Joined: Aug 2007
Posts: 2,026
Likes: 0
From: Belle Mead NJ
When I got time. I got to get my plow frame reinstalled on my truck, swap my 36's back on. Then change all the fluids and get her ready for winter. Plus think my plow needs some work also. Prob sand it back down again and repaint it. Ill just beat on it and see what happens, lol.
Senior User
Joined: Jun 2003
Posts: 114
Likes: 0
From: South-East Tx.
Low comp,
I had a cy. with low com. I pulled the dipstick out and reved up the engine, a lot of pressure came out the tube, mine was #8. When I pulled out the plugs I noticed #8 had a crack, I think that changed the heat range of the plug. I pulled the head and #8 piston had a hole down the side, melted the comp. rings and blew a hole through the side where the oil ring groove was, changed that one piston and truck still running 400,000 miles.
Posting Guru
Joined: Dec 2006
Posts: 1,639
Likes: 2
could be a bad valve seal and the oil is getting sucked into the cylinder and using seafoam is just cleaning the carbon off out of it and making it run better except for the oil leaking
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Posting Guru
Joined: Aug 2007
Posts: 2,026
Likes: 0
From: Belle Mead NJ
Na didnt fix it yet, still driving it, it comes and goes so its not bothering me. I dont really have time to pull it apart as its car number 4. Ill get to it sometime when I have finished fixing my truck(just got some upgrades to do) and fix the water pump leak on my mazda.