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