1992 Porsche 964 turbo 3.3

[iflickr]

hello every one first sorry for my bad english
sec ..
i have this porsche and i got problem there is a black smoke come out from the exhaust
and at the sec gear the turbo should open i guess , but the engine segmentation like the turbo don't want to open some guy tell me the problem is the Warm-up valve regulator
but i dont know if this is true or no ....


hope some one help

[MarkRobinson]

I'd rewrite your statement in a web-based translation page because some of the words were not properly translated.

If you have lots of black smoke on-boost, then your regulator is probably set WAY too rich, though it's easily adjusted with a allen wrench into the spring-loaded adjusting screw at the fuel distributor (7pm position from viewing from behind). Also, check to ensure you don't have a large vacuum leak.

Mark

[911nut]

I agree with Mark.
Seems like the WUR will fail rich. Problem with running the car this way is no power and dilution of the oil by excess fuel (very dangerous).
Best option is to have the WUR rebuilt by Brian Leask (930wur@cox.net).

[iflickr]

Originally Posted by 911nut

I agree with Mark.
Seems like the WUR will fail rich. Problem with running the car this way is no power and dilution of the oil by excess fuel (very dangerous).
Best option is to have the WUR rebuilt by Brian Leask (930wur@cox.net).

"Dangerous" what maybe would happen , please explain ? you make me afraid

[911st]

Black smoke sounds like oil.

Often the turbo seal will leak. If you remove the intercooler and there is a lot of oil in it, the turbo needs to be rebuilt. It is normal for there to be some oil coating or tackiness but it should not be wet.

If that dose not work, get a set of CIS pressure gauges and test you control pressures against specification. This will tell you if the WUR is a problem.

I would not make any adjustments to mixture at the fuel distributor until the above is checked.

You might have more luck on the 930 form with this question.

[smurfbus]

Black is more like too rich IMO. Oil is blueish and white we don't have to worry (coolant).

So it might be too rich to even spool the turbo.

[911st]

If to rich, it could be a leak in the intake. Probably at the intercooler seal (typical) but could be anyplace after the turbo.

[911nut]

Originally Posted by 911st

If to rich, it could be a leak in the intake. Probably at the intercooler seal (typical) but could be anyplace after the turbo.

Keith, Un-metered air would cause a lean condition.
White smoke is steam, blue smoke is burning oil and black smoke is running rich.
Fuel dilution of the oil destroys the lubrication properties of the oil and eventually the engine. One way to determine if this is your problem is to watch your oil level - if it is increasing and you aren't adding oil there is fuel mixing in with it.

[911st]

On boost - everything after the turbo has been metered and if there is a leak, for example at the intercooler seal, there will be less air than expected for the fuel delivered and it will go over rich.

Add to that the typical first boost metering over-swing that makes the car run rich to begin with and things could get interesting.

Such leaks do not always make much of a vacuum leak at idle or low load. They also would probably not effect idle quality much as they are before the throttle body.

A leak at the intercooler seal is a known point to consider if it is fuel. If it is oil, the turbo seal it usually suspected.

Me, I can not tell the difference in the color of smoke when I am flogging my car. Only when it is happening.

[911st]

PS, I would still put a set of CIS pressure gauges on it and check things out.

Not an expert, just what I would do.