1979-1993 & 94 Conv [Subscribe to Daily Digest] |
[Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Sudden loss of power, smoke from valve cover port and exhaust Posted by Bernie [Email] (#1501) [Profile/Gallery] (more from Bernie) on Sat, 21 Nov 2020 08:26:42 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 Members do not see ads below this line. - Help Keep This Site Online - Signup |
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 2003 9-3 Conv 2004 9-5 Arc Sedan 2005 9-3 SS 4 door 2005 9-3 SS Conv 2007 9-5 Aero Sedan 1986 900 Turbo Conv A few parts cars also
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.