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Date: Fri, 20 Sep 2002 11:01:43 +0100
From: Davey <NOSPAM_nosignolifenopsamorld.com>
Subject: Re: SAAB 9000 low power num3 cylinder fault


Stephen, excuse this being a bit "long winded"...... I think (with all due respect) that your mechanic is wrong to be honest, the oil control ring wouldn't normally stop the cylinder from firing, it would just make it burn oil, unless of course the oil had caused the plug to foul up with carbon and stopped it sparking, I assume that if you've done a compression check then you will of SEEN if the plug was fouled up. if you have compression on all the cylinders, (and one isn't very 'obviously' lower than the rest) then you have the "basic" conditions for the motor to run on all four. If the oil control ring was to busted you would have oil being burnt by that cylinder, probably (but not always) leading to a smokey exhaust etc. If your car has HT leads my 1st point of 'attack' after replacing the plugs would be to check each leads resistance and see if No 3 lead is a lot higher than the rest.If No3's resistance is higher than the longest lead then its a sure bet its fried and you need a new set of leads. If you have the SAAB Ignition module on top of the engine (as mine does) this can fail (mine did) and one cylinder drops out. The only cure is to replace it. Its not easy to check with the SAAB module if any one plug is firing, but the easiest method is to pull the module off and remove plug No3 after running the motor for a few minutes, the plug *should* smell of fuel and may be damp as well if it isn't firing (plus its likely to be 'cold' compared to the other plugs. (of course even if you have HT leads you can use this method to confirm that No3 Isn't lighting up). if number three plug is dry, and/or doesn't smell of fuel, to confirm that the injector is operating run the motor, stick a 'long' screwdriver gently onto the Injector bodies one at a time and pop your ear on the end (like a listening stick), u should hear them clicking or buzzing away quite nicely to themselves (check that when the headgasket was done, they didn't 4get to reconnect number three injector !!!!!) so long as number 3 injector sounds alive, turn your attention to the Ignition circuit.. I'd lay money thats where your fault lies. Work your way back from the plug through the system. 1st swap the plugs around, and see if your faulty cylinder "changes" to a different one !, if so, U need a new plug or 4 ! If you have the SAAB ignition module, then it may be worth your time to actually take the car to a SAAB dealer to confirm if the module is working or not, at least you'll know one way or the other ! If you dont have the SAAB module: Check the leads as above. Next port of call is the distributor cap and rotor, replace them, thats the easiest way to eliminate them. And that little lot ought to have found the fault........ Davey (Dave Bee's Autos) Steven Jack wrote: > Hi I have a 1990 9000S 2.0L which recently developed low power, a new head > gasket was fitted. There is compression on all cylinders, but removing HT > lead from num 3 makes no effect on the engine running, removing any other > causes it to falter. A mechanic suggested that the oil control ring could be > broken. Anyone care to comment . > > Thanks > Steven Jack > Kilmarnock > Scotland > > s.jacknopsam.net > >

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