Blue smoke

STUBALL

MEMBER
SAAB

Have a 2000 Saab Nine Five wagon with 2.3 (?), 4 cyl turbo charged engine with 119,000 miles on it. Just today I noticed that after accelerating just moderately, not particularly hard, and then taking my foot off the accelerator, a cloud of blue smoke then comes out tail pipe. The engine otherwise runs superbly with excellent power. No smoke at any other times, including cold start. Rings? Valves? Expensive? Kinda bummed as this is a recent purchase! Thanks, Stuball

3 Replies

BLACKOP555

MECHANIC
10,371 POSTS

Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. Remember it only takes a drop.

The check valve for the crankcase ventilation sticks which forces engine oil out into the exhaust pipe.

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Friday, October 19th, 2007 AT 9:51 PM

BLACKOP555

MECHANIC
10,371 POSTS

Also. If the coolant flow turbo is reduced, which results in the temperature becoming so high that the engine oil builds carbon deposits around the turbine-side bearing. Over time these deposits reduce the oil flow through the bearing, which means that engine oil is forced past the turbine shaft seal and out into the exhaust pipe, resulting in blue smoke.

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Friday, October 19th, 2007 AT 9:54 PM

JDORAZIO2007