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Old 03-17-2010, 07:35 AM   #1
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Need some suggestions...!! Turbo'd SVT

Anyone ever had smoke come from their valve cover vent hose?? Smells like oil, obviously because there is some up there, but Im not burning any. And there is no smoke coming from the tailpipe or the crackcase vent line, just the valve cover one. And this all started after a backfire blew up my intake manifold, yay me. Replaced that then this started.


About a week and a half ago the vent hose coming off of the valve cover started smoking. Not a little bit like it could be moisture or anything like that, but "smoke". So a buddy and I did a compression test on all the cylinders. The result was 50,100,100,100. We did another pressurizing test also and came up with the same cylinder reading bad.

Fast forward to last night. We took the head off thinking it could be a burnt valve or bad piston rings or head gasket.

There are no cracked valves, nothing that looks like it would be causing any trouble, even the low cylinder was still firing and the combustion chamber was as clean as all the others.

The cylinder walls looked emmaculate, no scratching, maring, scaring and you can still still see where it was honed from the factory.

The head gasket, was holding it seemed, but when we took it off you could pull apart the layers..... is that normal for these type of gaskets? But like I said it was holding, there were no signs of the compression ring leakage.

So before I go and spend 500 or more on a valve job, I would like to know anyone has ran across this and could give some idea of what is going on. I jsut think its weird that is only coming out of the valve cover.

Thanks,


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Old 03-17-2010, 08:07 AM   #2
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how much smoke? is it thick? what color? i could just be normal crankcase gasses.
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Old 03-17-2010, 08:34 AM   #3
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sounds like cracked ring lands
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Old 03-17-2010, 09:19 AM   #4
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Wear you spraying nitrous for the backfire?

flip the head over and pour kerosene in the pockets with the plugs in place and see if any of the valves leak...Its crude but effective
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Old 03-17-2010, 10:58 AM   #5
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I would pull the piston on the low cyl and check it , more then likely thats where the issue is

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Old 03-17-2010, 12:31 PM   #6
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how much smoke? is it thick? what color? i could just be normal crankcase gasses.
It's white smoke, thick enough for me to notice it coming out from under the front of my car. And there was zero smoke for two months until the backfire occured
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Old 03-17-2010, 12:33 PM   #7
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Wear you spraying nitrous for the backfire?

flip the head over and pour kerosene in the pockets with the plugs in place and see if any of the valves leak...Its crude but effective
No nitrous, and we did turn it over with the plugs in and did that test with with some gas. the only thing we saw was a very small amount of moisture on one of the exhaust valve stems.
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Old 03-17-2010, 12:35 PM   #8
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I would pull the piston on the low cyl and check it , more then likely thats where the issue is

Tom
Was thinking about doing that. The only part im confused about is if it was the piston/rings, wouldn't the smoke be pushed out the back through the exhaust?
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Old 03-17-2010, 12:36 PM   #9
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white smoke is generally indicative of water/coolant burning/vaporizing. since the HG was separated around that one cylinder, that may be the issue. replace the HG and head after checking valve seal as recommended above, then recheck compression.
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Old 03-17-2010, 12:57 PM   #10
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That was the first thing I was gonna do before I started digging in more and more. Rather spend 40 bucks on a gasket then 1000 on something else
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