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1995 960 cylinders 5 and 6 not firing 900 1995

posted by  960roller on  Thu Jun 7 15:29 CST 2012
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last visit: Wed Jun 18 17:08 CST 2014
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My '95 960 is not firing on cylinders 5 and 6. I have replaced the coils, injectors, spark plugs, and wires. I get spark from the coils, and there is power to the injectors. But the car runs real rough, and when I pull off the coils from those cylinders, there is no change. The same is true when I remove the injector connectors. When I do the same to each of the other cylinders, the engine gets even rougher, so I know that 5 and 6 are the problem cylinders.

The head gasket went bad, and so I tried a sealer just to see if I could keep the car running while I look for a replacement engine. I now get 150 lbs compression in 5 and 6 and almost 180 in the others. The pressure holds in all 6. There seems to be no leaking between coolant and lubrication.

I am going to switch the power stages but wonder if that will make a difference. Any ideas will be a big help. Thanks.







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    1995 960 cylinders 5 and 6 not firing 900 1995

    posted by  aleekat on  Thu Jun 7 15:43 CST 2012
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    last visit: Fri Oct 24 13:19 CST 2014
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    Sounds like you need a head gasket. I think you know that. All the plugs pulled when you did that compression check?
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    Post Back. That's whats makes this forum work.








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      1995 960 cylinders 5 and 6 not firing 900 1995

      posted by  960roller on  Fri Jun 8 11:10 CST 2012
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      last visit: Wed Jun 18 17:08 CST 2014
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      I pulled the spark plugs one by one and got the results shown in my previous message. Shouldn't 150 lbs compression be sufficient to get a cylinder to fire?

      I am just looking to keeping the car running until another option becomes availaable. Thanks.








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      1995 960 cylinders 5 and 6 not firing 900 1995

      uid 15548's pic
      posted by  volvo245gti on  Fri Jun 8 07:36 CST 2012
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      last visit: Sat Sep 13 16:32 CST 2014
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      Power stages control 3 coils, not 2, so I doubt it's a power stage...and they're 3 consecutive in the firing order so 5 and 6 aren't even controlled by the same power stage. I tend to agree that it's likely time to think about a head gasket.

      --
      Dale







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