Having problems with your 1999 Saab 9-5 ?

Saab 9-5 blowing white smoke from exhaust

\015 While driving yesterday I noticed that my 9-5 was blowing large plumes of white smoke on occasion, approx every 60 seconds it when\302\240accelerating, decelerating and even braking - could't find a pattern. The temperature of the engine seemed fine, the engine performance was fine. I put more oil in but it only took half a litre. It did one very large plume and there was a small noise from the engine and even though it continued to drive fine I decided that was enough - I need to find out what is going on. Does anyone have any ideas?\015 Posted / edited by AnonymousUser on : 19-08-2019

Answers :

One way to check for a blown head gasket, is to simply smell the coolant reservoir. Pop the cap, and see if it smells like raw gas. Every headgasket, I've diagnosed has had this smell, even if the oil is not contaminated. Another way is to hook up a coolant pressure tester, and run the vehicle for 15-20 mins or so. If the head gasket is blown, the pressure will exceed 15 psi. sometimes as high as 25 psi. If there is oil in the coolant overflow tank, the head is cracked, about 90% of the time.
\015\012 I'm working on a 03 Saab 95 2.3l t. This vehicle smokes on initial start up, then the smoke disapates, and the vehicle is fine. Another mechanic diagnosed it as bad valve seals. I disconnected the pcv system, and the vehicle no longer smokes. If the valve seals have gone bad, the vehicle will smoke on acceleration. Also if the turbo seals are leaking it will smoke more heavily on acceleration.
I am going to have to go with Toyota Ed on this one. White smoke almost always equates to coolant in the combustion chamber, while leaking oil seals in a turbo will normally create a sooty dark exhaust smoke. Additionally, I have never seen a failed turbo lead to a head gasket failure. All this said, it is still remotely possible that the turbo is failing, although one would expect to hear some slight increased turbo bearing noise and possibly some loss of boost if the turbo were failing.
Check the coolant reservoir to see if any globs of oil are floating in there and check the oil to see if the oil has become a milky brown color. If either of these signs is present, it indicates cross-contamination between the cooling and lubrication systems, thus pointing to the head gasket. The surest way to diagnose a failed head gasket, short of removal and visual inspection, is to have a leak down compression test performed.
Repair Help & Product Troubleshooting for 1999 Saab 9-5

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