Question about 2002 Saab 9-5

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Cloud of smoke on cold start of my saab 9-5 v6

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  • pentsakov Jun 04, 2009


  • Brandon

    I agree with the valve guide seals, but I wonder what color was the smoke? Black, white, or blue?

  • Anonymous Mar 15, 2014

    2005 saab 9-3 rough cold start



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Your issue would be bad "valve stem seals". They are hard rubber seals that wrap around the valve to seal out oil, and prevent it from going into you cylinders. When they get old and worn out, they will allow oil to seep into the cylinders.

Posted on Jun 03, 2009

  • its420_us Jun 05, 2009

    Again, you issue is bad "valve stem seals".


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Blue smoke is generally gas. I only have the option to post solution, but if it's fuel injected (I assume that new it is) then you may have a O ring or a seal in the injection unit that is letting gas leak by. Too much gas = blue smoke, so it is running rich. If it is a n injector it can be a pain and expensive to fix, if by a miracle that thing has a carb (I doubt it) you can adjust the mixture down. I'd take it and have the code reads, maybe a fuel sensor is going bad, it may read and tell you which injector is leaking, not holding proper vacuum pressure. Most auto parts stores can run the codes the for free. I'd check that, the good news is they can run a long time like that so you can take time and figure out when, how, and if your fix it. Don't much much about Saabs in general but hopefully ths points you in the right direction. This is common among fuel injected vehicles as they get older, not bad problem if the car runs fine, but can kill you on emission testing (if you have to pass them). The reason it stops smoking is either 1. It lets fuel drip past and you burn it while starting the car and it comes out in the puff of blue smoke, 2. It seals itself under pressure, so when you shut it off it leaks and you get puff on a cold start or 3. It is leaking fulltime but with the exhaust being pushed out there is enough exhaust mixing with you that you can't notice it while driving. Good luck with it!

Posted on Jun 04, 2009


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