Re: Sudden loss of power, smoke from valve cover port and exhaust - Saab 900 Bulletin Board - Saabnet.com


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Re: Sudden loss of power, smoke from valve cover port and exhaust
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Posted by Bernie [Email] (#1501) [Profile/Gallery] (more from Bernie) on Sat, 21 Nov 2020 08:26:42 Share Post by Email
In Reply to: Re: Sudden loss of power, smoke from valve cover port and exhaust, 85spgwt [Profile/Gallery] , Sat, 21 Nov 2020 02:26:22
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Hello,
With 1 cylinder with no compression a leak down test is the best way to diagnose without removing the head. A good inspection camara may show some forms of damage but not all. With a leak down test on the dead cylinder you must first bring that cylinder to top dead center with both the intake and exhaust valves closed. then you introduce air through the spark plug hole. A leak down tester will give you a percentage of leakage. Then you find out were the air is escaping the cylinder. If it comes through the exhaust you most likely have a burnt exhaust valve. If it comes through the intake/ throttle body an intake valve is the most likely source. If it comes out the oil fill cap it it either rings or piston failure most likely and lastly if if comes out the coolant bottle a head gasket is the most likely failure. Good luck, Bernie

_______________________________________ George Riggin Specialty Automotive Current Saabs 1993 900 Turbo Conv. 1993 900 Turbo Conv. Auto 2002 9-5 4 Door Linear 2002 905 4 Door Aero 2003 9-3 Conv. Viggen appearance package 2004 9-3 SS Conv 2008 9-3 SS 4 door


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