Blowing Smoke

Hi Guys,

My 82 911sc started blowing smoke yesterday (or at least I just noticed it), I was accelerating hard in 2nd gear and noticed when I lifted off that there was a cloud of black smoke behind me. The car runs fine, idles well, was not overfilled with oil and has been rebuilt less than 20k miles ago. My first thought was valve guides but the engine just doesn't have a lot of miles on it. I checked today and I get smoke all the time but much, much more on deceleration. Is it possible something is causing it to suck oil in through a breather hose or any other area? If I broke a ring would I have good running engine still? Any thoughts would be much appreciated.

Thanks,


Seth

Black smoke may be rich fuel.

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Robert Stoll
83 SC
83 944

Pulled my plugs and found that my #2 plug is slightly oiled down. My thought is a broken ring but I'm hoping for another less expensive reason. I also checked my vacuum and it runs a steady 15hg. I thought about the rich mixture problem but the smoke appears to be oil related.

Thanks,


Seth

Do a compression test.

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

If you are getting blue smoke on deceleration it is most likely valve guides and/or valve guide seals. Also, are your rocker shafts leaking? If they are the oil can drip on to the exhaust system and smoke. Another option can be a "stuck" ring. I've also seen the cyclinder cross hatching worn out on a low mile motor.

Skip the compresion test and have a leak down test done. It will tell you if it is the top end, bottom end or both. It costs more but is cheaper in the long run to determine what is wrong..

Good luck.

Pete

Skipping the compression test could be a very costly mistake. Taking a smoking 911 to a shop for a leakdown test is an invitation to be ripped-off for several thousand dollars!

A compression gauge should be in any 911 owner's toolbox that intends to keep the car very long. A leakdown tester costs less to buy than having it done at a shop, even if you have to take the car to a service station and use their shop air! Relying on others to do tests for you is laziness that can be very costly in the long run ... test results have to be seen in person to be trusted. Fraud is rampant when gullible 911 owners take their cars to shops and leave them unattended ... just ask a few board regulars about recent experiences!

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Warren Hall
1973 911S Targa
1992 Dodge Dakota 5.2 4X4 parts hauler

Thanks Guys,

I own a compression tester so that will be the next thing I'll do. I just need to find the time.

Thanks Again,

Seth