Question about 1986 Porsche 944

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86' Porsche 944 turbo

I have an intercooled porsche 944 turbo. I thought the turbo went bad and it was blowing the oil into the intake. When I got the intake manifold off and the connecting hoses, I found that the oil was comming from what I would have thought would be a hose connected to a pcv valve. I don't think that my 86' 944 has a pcv valve. Any suggestions? It is blowing mas amounts of oil into the intake. Like 3-4 qts per 1000 miles.

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  • rholtporsche Aug 03, 2008

    I was given a fairly acceptable answer to my problem, but I am not convinced. One of the vacuum lines on my 944 turbo is dumping oil into the intake j boot, just before it goes into the throttle body. The solution read that it was likely the valve seats. How would the valve seats leak oil back agaist the flow over 18" of intake manifold back past the trrottle body into the intake "j boot." The oil is clearly coming from a vacuum line. Where would the vacuum line be getting the oil? Is there a one way valve, like a pcv valve, that may have gone bad that is letting the oil come from the valve seats. I read in one forum that there may be a solenoid that controls/restricts the oil from coming through the vacuum line. My car is dumping 3-4 quarts of oil every 1000 miles.

  • rholtporsche Aug 03, 2008

    An oring that comes from where on the back of the turbo? I have a kkk k26 turbocharger that is cooled by oil. The oil isn't coming from the turbo, it is coming from a vacuum line that bypasses the turbo and connects with the intake boot that takes air from the turbo into the intake manifold. The oil isn't coming through the turbo.

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Your engine does have a PCV (Post Crankcase Ventilation) Valve, and could very well be the source of the oil fouling your air intake.
What you described can occur when the throttle body becomes varnished up/clogged up. Your 944 is over 20 years old and probably could use a Major Tune up (which should include cleaning/servicing of the injectors and checking/cleaning the throttle body and checking the plenum for leaks and the action of the butterfly). It's not to difficult to do a DIY removal and cleaning of system if you have a decent manual specific to your 86' 944 (I only use Bentley's Manuals for German autos personally, but factory manuals are great if your an expert Tech.?).
Good luck and I hope your enjoying your Sports Car to the fullest soon. :)

Posted on Aug 03, 2008

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Hi,

To my understanding, the particular vacuum line that you suspect as the source of oil may simply be the exhaust vent of the crankcase. Pls check if the other end of the line enters the valve cover or anywhere back to the engine. If it does, with or without a PCV valve, oil would pass that line and therefore be feedback into the intake. To my knowledge this is basic engine design and therefore be deemed normal; the ventilation of the crankcase and the excavation of the unwanted gas inside. This is complimented by the vacuum which helps maintain the crankcase to be a slightly lower than ambient air pressure. But what is different here is that as based on your description, this leads to a relatively high oil consumption.

Might it be possible that the engine is operating at a slightly higher temperature and/or for some reason(s), some of the oil heats, evaporates or turn gaseous and sucked into the combustion chamber through that vacuum line.

If and only if this assumption will hold true, then the problem is not with the vacuum line, nor the presence or absence of a PCV valve but an engine issue. Am not even sure if your vehicle uses a mechanical PCV valve (one that you can shake to test if the ball moves or blow through only one way). Perhaps you might have the compression checked and the oil pressure read using a mechanical oil pressure gauge (that uses a copper tubing to sample the actual oil/pressure) instead of the electrical oil pressure sender.

If the oil enters the intake, then it would enter the combustion chamber. Have you checked the sparkplugs?

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 03, 2008

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Perhaps there have been modifications to original installation.
you have not mention if car boughted used or new.
http://www.turboost.lt/eng/catalog.php?fam=K26

Posted on Aug 03, 2008

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U need to with a professinol car mechenic

Posted on Aug 03, 2008

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At the back of the turbo there is a rubber o ring it will be coming in though there

Posted on Aug 03, 2008

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Well it could be the seals, but also you may have to look at other sources of the oil, i have been reading this thread i found online and somehow the problem poster had almost the same as yours and was able to trace where the oil is coming from. here is the thread good luck, hope you get the culprit identified.

Oil Leak on Porsche 944 Turbo intake

Posted on Aug 03, 2008

  • marlon john madrid
    marlon john madrid Aug 03, 2008

    fair enough, we wait for ideas then, i'm willing to find out the answer myself.

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