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940 turbo- missing at speed 900

posted by  whodom on  Fri Aug 27 04:14 CST 2010
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last visit: Fri Nov 29 15:57 CST 2013
[RELATED]

Car is a 1993 Volvo 945T with ~205,000 miles on the clock. I'm trying to get it in shape for my son to take to college ~300 miles away in a month.

The car has developed a miss at speed. It seems worse under light acceleration or steady cruising and almost disappears under boost. Car had new plugs, plug wires, rotor, and cap installed ~5000 miles ago. New in-tank fuel pump installed ~500 miles ago; new out-tank fuel pump ~5000 miles ago.

The car is overdue for throttle body cleaning (idle is very unsteady) which I am going to do this weekend.

Any suggestions for trouble shooting the miss would be appreciated. I checked the FAQ but didn't see anything close.

Thanks,
Hugh






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