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Blue smoke after being driven for awhile - 95 Saab Cars & Trucks

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Oil is getting into the combustion chamber and being burnt you have piston rings failure

Posted on Apr 29, 2015

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If you can then smell the smoke. if it smells of petrol you will need a tune on your car ( getting too much petrol ). if it has no smell or very faint then it could be your head gasket. (water getting to the head causing steam ) worst case would be piston rings expanding through heat and letting oil through ( smell of oil burning ) check oil filler cap and dip stick for white gunk/check exhaust for water dripping out. these are head gasket signs

Posted on Apr 29, 2015

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Car lost power uphill with air on and was hard to start once. blue exhaust smoke when reved up otherwise runs good


Blue smoke is not good!! Piston rings are bad or valves. On a Mercedes it will cost you more than the car is worth at this point. Unless you have a sentimental attachment to the car and really really want to keep it., I would get rid of it. 123,000 mile is a great life for a 1989.

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Blue smoke


Blue smoke (how many miles on engine, 50k or 500K???????
to some this means, burning oil, others steam
it that blue smoke lingers a long time that is oil burning
and smells just like oil burning.
and means 2 things,
1: engine burns oil.
2: if car had autotmatic trans the vacuum modulator love fail
and suck ATF fluid to the intake plenum and burn it, and bingo burning oil like mad.
3: PCV valve packed solid,and forces engine to leak oil or burn oil. or both. this is a 50k miles service point, skipping this?
4: gas in the oil making it thin and not sneaks past valve stems.
does oil change cure this.>?

now engines.
worn out engines smoke. (burn oil)
as do bad valve guides and seals.
and bad piston rings.
100 years same story, and miles matter. History on engine too.
matters.

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When i stop for awhil and then i take off it smokes like a blue color it only happens when the engine is hot not cold people have told be it's the valve stem seals and others have told me its the piston...


If it smokes blue only when you first start it, it is the valve stem seals, that is caused by oil seeping past your seals into the valves and when you first start it the seeped oil gets burned on ignition. If you have blue smoke all the time when you are driving, than it is the piston rings, either way you should look at replacing your motor soon with either a good used Japanese engine from Japan or a rebuilt or remanufactured engine.

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have you driven it at least 100 miles since repair?, the oil residue builds up inside the exhaust and burns off very slowly from the previous failed turbo seal.

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If it only has 500 miles on it I would drive it awhile before doing anything. It could be the rings just haven't seated in yet.

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