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Help! I have a 2005 911 C2S with 64k miles and suddenly had a rough idle at a stoplight. no check engine light. parked it for a week, cranked it up and large puff of blue smoke, still rough idle. Any ideas on what it could be?

Any help would be greatly appreciated!

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When the smoke first started it was at start up only... I cleaned the throttle body and I think I fixed the rough idle. I cranked it up and a large billow of smoke puffed (blue smoke) but stopped at idle. As soon as I drove it (put some load on the motor) it smoked every time (like at a stoplight take off) so I have parked it until I can get it fixed. Is it a 3.8 L C2S... The check engine never blinked, just popped on and stayed lit.

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Read other posts here on cleaning the throttle body.

What engine size is this? 3.6 or 3.8l?

This can be the Air-Oil seperator as well as a problem with the cylinder walls being scored. This would require a Bore- scope to inspect the walls.

Pull codes with a generic scanner if possible. Did your check engine light start blinking when the rough idle occurred?

S.Vizcarra

Porsche MeisterTech

http://meistertech.blogspot.com/

3.8L, Smokes on start up and when a load is put on the motor, large amount of smoke... I am scared to crank it as I do not want to do more damage. The check engine light did pop on but never blinked. I cleaned the throttle body and I think I have fixed the rough idle.

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Comes the smoke from one or both exhaust tips? From only one tip could be an issue on the relevant cylinder bank, on both tips something general as a crankcase breather issue, too high oil level, etc.

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  • 2 weeks later...

Comes the smoke from one or both exhaust tips? From only one tip could be an issue on the relevant cylinder bank, on both tips something general as a crankcase breather issue, too high oil level, etc.

Smoke only comes from the left exhaust... cranked for the first time in a week last night and the smoke was more white, but thick. car runs great, just smokes like heck. I towed it to the shop today. What in your opinion could it be?

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The 05 997's are unfortunetly known for engine issues. Porsche has been very good about covering engine repairs/replacement in the 05's even if out of warranty.

Hopefully yours in not serious. Although smoke coming from one bank of cylinders is not a good sign.....

Good luck and keep us posted of what the diagnosis is.

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  • 2 weeks later...

The 05 997's are unfortunetly known for engine issues. Porsche has been very good about covering engine repairs/replacement in the 05's even if out of warranty.

Hopefully yours in not serious. Although smoke coming from one bank of cylinders is not a good sign.....

Good luck and keep us posted of what the diagnosis is.

I hate to hear about the 05's having trouble, I wonder if they will sell me an extended warranty? Turns out my problem was an air/oil seperator... as I had it changed and it has not smoked since. There was oil in the intake, which was a big clue. As the AOS sits above the motor on the top-left, the oil was getting into the intake on the left side, making the left tailpipe pour the smoke. I am wondering if there is anything I can do to keep the motor in top shape, as many of these posts seem to be down on the '05 C2S?

Thanks again, all.

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