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Old 05-17-2005, 05:58 AM
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86 951 Driver
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I want to try and diagnose what is causing my car to smoke. Would a leak down test be a good idea? Also could that tell for sure if my car has a bad headgasket. I don't have any coolant/oil mix or burning coolant. I'm burning oil I know for sure. I think it is the valve seats or seals. Also any St. Louis, MO have a leak down tester?
Old 05-17-2005, 07:22 AM
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Mark944na86
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Most basic question: What colour is your smoke?

(And, parenthetically, that is the most bizarre use of an apostrophe I think I've ever seen.)

-Mark
Old 05-17-2005, 07:23 AM
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special tool
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What kind of car do you have and have you modified the crank vent system at all?
Old 05-17-2005, 09:57 AM
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Originally Posted by Mark944na86
Most basic question: What colour is your smoke?

(And, parenthetically, that is the most bizarre use of an apostrophe I think I've ever seen.)

-Mark
Is thick and white bad? I'm talking James Bond type smoke screen...
Old 05-17-2005, 10:15 AM
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my 84 is in the shop right now for the same reason.....if the smoke smells like coolant then I would say head gasket...thats what the Porsche mechanic working on my car said....I am waitng for his call this week with the bad news ($)......
Old 05-17-2005, 06:20 PM
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I have a james bond type smoke screen but it smells like oil, not coolant. The smoke is more of a dark gray color.
Old 05-17-2005, 06:24 PM
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Say the hose from the air/oil seperator is disconnected, or pinched off, would that cause it to burn oil? (Just asking)
Old 05-17-2005, 07:19 PM
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Yes - The 951 is VERY, VERY sensitive to the crank VACUUM. The turbos like to have the drain oil PULLED away and down from them. If it backs up, it will overload the seals on the turbine side.
There is a reason that the hole at the top of the air/oil seperator is the size it is.
This is one of those stock things that you are better off not ****ing with.
If you have to, make sure that your catch can retains the proper amount of vacuum - just the way Metzger wanted it to.
Old 05-17-2005, 11:18 PM
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Where does the line from the AOS run? Right on to the J-Boot? Just need to make sure I have mine right. It burns a lot of oil right now, and I don't think it's by the rings.
I'll check the intercooler pipes for oil, we'll see if this is the cause.

Thanks for the info.
Old 05-17-2005, 11:25 PM
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Oh noo... he sounds like he has the Rock Blacky Special. The Oil burning problem that killed the black car.
Old 05-18-2005, 06:32 AM
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What was the problem with the oil burning? What caused it? I would like to still drive a Porsche for a while.



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