924Board.org

[Zuffen]

The turbo is the first thing people like to blame but there are other things that can cause smoke.

You have to determine what the smoke actually is first. Oil, fuel or coolant.

What does the smoke smell like , what does the exhaust smell like?

Then you have to determine where it is actually coming from.

Turbo , turbine side or compressor side?

Or is it excess fuel from a leaky injector?
check your oil for coolant and fuel smell.

Check your coolant for oil and if there is any loss or preassurization of the system when the car is running.

How much oil do you loose?

How often do you change it and do you ever run engine oil treatment?

What do the spark plugs look like? Any fuel smell or heavy deposits.

How does the engine run after start?

If they turbo is leaking oil you can try some engine treatment to remove the deposits on the metal seals. You may experience worsening of the problem too. Sometime the coking is so bad that the treatment will remove some of the deposits but not enough and cause a sealing problem worse than before.



_________________
Bob Dodd - 924turbo@cox.net
931 1982, 944 1982 euro, 924S 1988SE, 93 968 tip 06 Silver Cayenne S, 06 Black Cayenne S

I have Way too many cars, parts for the 931,944 and 951

[cs]

could it be valve guides since it only does it after it's been sitting. one way i read to check the guides was to coast down a long hill, then when you get to the bottom hit the gas. a big puff of smoke is usually guides. and most of the time coolant is white smoke, fuel is black, and oil is blue.

[Gregsy14]

[ This Message was edited by: Gregsy14 on 2002-01-09 20:55 ]

[ This Message was edited by: Gregsy14 on 2002-01-09 21:01 ]

[wdb]

Ive seen valve covers full of thick sludge that blocks off the drain holes,oil pools in the valve cover and over time drains past valve guides into cylinder,easy to check

[larso]

bad gas smells like poopy snowblower crap.

Oil is purple and smells like burnt peanuts, it does not at all in any way smell like bad gas.

Coolant does not smell, it only smells sweet at low temps from my experince, for example just cranking the motor with coolant in cylinders and smelling the exhaust pipe should make white sweet smell come out...but running the car it won't smell. Coolant comes out in great quanitiies and puffs, if a white cloud of smoke is left at a stoplight, but it does not smell, it's coolant.

[ This Message was edited by: larso on 2001-09-05 16:34 ]

[Rick MacLaren]

If it smokes at idle or stopped then it's probably that damned T junction pipe. Pray it's not.

Never assume a faulty gauge. Get a cylinder head temperature gauge to verify and compare against your own. Always assume the gauge is right until you're proven wrong. It's a conservative way of doing it, but your head is nearly irreplacable, so maybe conservative is best.

_________________
1980 Porsche 931 C2H5OH/H2O injected 15 PSI
1979 Porsche 924

[ This Message was edited by: Rick MacLaren on 2001-09-06 07:13 ]

[larso]

um, my temperature gauge read at the top of the white block when my car was overheating.

That was part of my big expidenture with my 931, is that i trusted the gauge, and the bleeder.

[larso]

so get the gauge fixed for sure, buy a new sender or do as Rick says and get a cyl head temp reader.

If you never have any gulps or burps in the system and the coolant level stays the same level and color, it's not the head gasket

[wdb]

if the car smokes when idling it is probably your rings,there not scraping the oil off the cylinder walls.do a compressiojn test to know for sure

[ericj001]

Hey all,
havent been here in awhile, love the new format!!
ive a pending turbo replacement, unit should be in any day now. i tried to "get away" with some new sealing rings and such, no good.depending on my oil fill level, i get more or less smoke. high dipstick = smoke AFTER warm up, and at idle at long lights. I suspect im getting some smoke (definately oil smoke) all the time, but its not enough to see from the mirror while driving. I keep it a half quart down and get very little smoke that way. spools up fine, little detectable power loss, ect. had two porsche mechanics tell me the turbo needs rebuilding, plus my own research. ive a exhaust leak at the pipe to housing juncture, smokes from there and is a little "wet" after sitting under, so im fairly sure my inner seals are shot.
does anyone have a suggestion for getting to the outer exhaust housing bolt? its right at the wheel tub seam, and i cant get in there for the life of me...the nut is "missing"(thus the exhaust leak) but i cant even get a new one on temporarily. just no room to wrench, from above or under. or am i missing an angle? any help is appreciated.
thanks,

_________________
Eric
82-931SE
78-924
"appreciate who you have more than what you have"

[ This Message was edited by: ericj001 on 2001-09-09 23:59 ]

[Gregsy14]

[ This Message was edited by: Gregsy14 on 2002-01-09 20:57 ]

[ericj001]

sometimes a good run will blow out the "stuff" that builds up and such, help the turbo seal better. that worked for me for awhile, but eventually it always came back for me..guess it was too little too late. hopefully youll have better luck..

[larso]