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Car Forum / Saab Cars / July 200781 900T woes
The trusty old 81 900T auto sedan failed to proceed for the first time in over three years. Started on 3 cylinders, ran for 300M and cut out completely half way round a roundabout. Coasted off. Turned over but no interest in firing, except occasionally on one cylinder. Plenty fuel & pump running. Gave up just before flattening battery & towed to local w/shop. One cracked fuel line and drowned plugs (funny that). Valves & timing chain seem ok, but compression *not* - 80, 65, *25*, 80. Now running basically ok again. Car uses *no* oil or coolant between changes. Ideas? Busted rings? Worth a pulldown or likely cheaper to just swap in a known good powertrain? Any advice welcome. Cheers > The trusty old 81 900T auto sedan failed to proceed for the first time in > over three years. Started on 3 cylinders, ran for 300M and cut out [quoted text clipped - 6 lines] > Ideas? Busted rings? Worth a pulldown or likely cheaper to just swap in a > known good powertrain? Any advice welcome. Cheers I'd be inclined to pull the head off and see what that reveals. Paul 1989 900 Turbo S http://saab.go.dyndns.org/ >> The trusty old 81 900T auto sedan failed to proceed for the first time in >> over three years. Started on 3 cylinders, ran for 300M and cut out [quoted text clipped - 13 lines] > 1989 900 Turbo S > http://saab.go.dyndns.org/ I second that opinion. Those compression figures indicate that you may have a burned exhaust valve, or that might be what you end up with unless you do something. And eventually a cracked head too -- like I did:-P Frode >>> The trusty old 81 900T auto sedan failed to proceed for the first time in >>> over three years. Started on 3 cylinders, ran for 300M and cut out [quoted text clipped - 8 lines] >> >> I'd be inclined to pull the head off and see what that reveals. > I second that opinion. Those compression figures indicate that you may have > a burned exhaust valve, or that might be what you end up with unless you do > something. > > And eventually a cracked head too -- like I did:-P The 8V head is certainly prone to cracking and could well lead to that bad compression on cylinder 3 with an intact head gasket keeping oil and water out of the equation. Paul 1989 900 Turbo S http://saab.go.dyndns.org/ > The trusty old 81 900T auto sedan failed to proceed for the first time in > over three years. Started on 3 cylinders, ran for 300M and cut out [quoted text clipped - 6 lines] > Ideas? Busted rings? Worth a pulldown or likely cheaper to just swap in a > known good powertrain? Any advice welcome. Cheers Have it driven it long enough? Long enough until the coolant warms up? Is this an 8 or a 16 valve head? ======================================== Trying to remember which 8 valve head cracked in cylinder no 3, mine (cracked) was on a 1983 car (not turbo, 8 valve). If 16 valve I don't know if the same problem applied. To test the rings for compression, do the compression test again and put in through the sparking plug hole a teaspoon of oil. If compression returns to normal on 3, i.e. comparable to the other cylinders then the rings on 3 are gone. If it helps a little. Regards Charles  SignaturePlease remove _removeme_ to reply. > The trusty old 81 900T auto sedan failed to proceed for the first time in > over three years. Started on 3 cylinders, ran for 300M and cut out [quoted text clipped - 6 lines] > Ideas? Busted rings? Worth a pulldown or likely cheaper to just swap in a > known good powertrain? Any advice welcome. Cheers Hi Hippo, surely that one compression number doesnt look good, but if the engine is running reasonably well then the problem is not that. I suspect an ignition problem really... maybe some moisture got somewhere it should not be (coil, ignition leads ..) Combined with the bad fuel supply it is no surprise the cold engine had trouble running... If the sparks stop for a moment, the plugs will be wet and will not fire again for a while. Richard Thanks to everyone. Tomorrow is its last day of registration for the year so I'll take the offer I got to buy the turbo installation & my good set of wheels off me then upgrade to a nice 93 that just came along. No time to start doing a major teardown at the moment and need two operating cars in the family for the foreseeable future. Thanks again. Cheers >Thanks to everyone. Tomorrow is its last day of registration for the year >so I'll take the offer I got to buy the turbo installation & my good set >of wheels off me then upgrade to a nice 93 that just came along. No time >to start doing a major teardown at the moment and need two operating cars >in the family for the foreseeable future. Thanks again. Cheers I heard through the grape vine where the car might be going to. 8-) Nothing at all wrong with that since it's probably the best way to ensure as much of the car as possible is recycled. How similar is your 81 turbo to my blue-coloured 81/82 turbo sedan? I should make up an excuse to drive down to Nowra for a visit since it's not that far from here... Craig. SignatureCraig's Saab C900 Page at | Craig's Classic Saab Workshop - Sydney .au http://lios.apana.org.au/~c900 | http://www.classicsaab.net and other URL's Email: c900@lios.apana.org.au | For Saab 99/C900/9000 Enthusiasts World-Wide! Alternate: saabonaut@gmail.com | Web-forums, galleries, library, links, etc. |
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