Question about 1999 Oldsmobile Bravada

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1997 volvo850gtl extreme smoking from exhaust

1997 volvo850gtl extreme smoking from exhaust
runs fine but had to replace cam seal; leads me to believe it has crankcase pressure and to change the pcv valve--where is the pcv valve?

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  • Anonymous Mar 18, 2014

    How do you get to the PCV valve In the back?

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Black smoke ( burning too much gas)
blue smoke (burning oil)
white smoke ( burning coolant)
hope this helps

Posted on Jun 24, 2009

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There is no PCV Valve on this car as well as many other turbocharged volvos. There is an oil trap (also called a flame trap) which comes clogged after time if a low quality oil is used, or if you neglect to change your oil every 3 to 5 thousand miles. You are correct about the crankcase pressure, if you would like to confirm this is your problem simply take off your oil cap. If there is air forcefully coming out of the oil port, then you most likely have a clogged flame trap.

I do have one suggestion before replacing the flame trap and its tubes, and that would be to run Mobile 1 FULL Synthetic oil in your engine with a fresh QUALITY oil filter (Mobile 1, MANN, or Purolator Do not use Fram) and 3/4 of a can of Seafoam (most auto stores carry it, even walmart) in your oil as well. This may unclog your flame trap. Run the car for 500 miles, and if you can afford to, repeat the procedure a second time. After that continue to use a quality Synthetic oil (as the detergents will help clean the engine) After about 3 oil changes you should be safe to go back to a non-syntehtic oil if your wallet needs you to. I recommend Castrol GTX (so does volvo) If the flame trap and its lines still remain clogged, the parts will run you around $120, but the labor is a bit intensive as you have to remove the intake manifold to get to it. I would reccomend the above procedure even if you plan on replacing the flame trap anyways to clean the engine or else you may clog your new flame trap.

If you are loosing oil and have really bad smoke it is likely that your turbo now has a bad oil seal (again usually caused by lack of maintenance or poor grade oil) If you continue to drive it like this you will ruin your catalytic converter and cause yourself another high dollar repair. I have seen turbo's with seals so bad that the oil is not burnign blue, but it is burning black because it is heating up due to it being stuck inside the exhaust system. I have also seen burning oil from turbocharged cars that simply need an oil change... if the oil is old and has thinned it can slip by the turbo seals and be burned in the exhaust.

If you are handy (and if this beind the worst case senario), removing and rebuilding the Mitsubishi turbochargers on these engines is not hard and the rebuild kits can be found for under $60 (vs $350 to $1000 for a new or used turbo)

All in all, my first step would be to change the oil and then go from there.

Be sure to always let your car warm up to normal temperature before spirted or heavy driving in the winter months, and be sure to let ANY turbocharged car to idle for AT LEAST 30 seconds after heavy or spirited driving before turning it off. This will prevent oil from sitting in the turbo lines and the turbo itself and burning (causing sludge build up)

Posted on Sep 29, 2009

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Either crank pressure or turbo seal if it were crank pressure you more than likely would hav a huge leak

Posted on Jul 24, 2009

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