Question about Volvo 940
I would check rotor button (under the distributer cap) or the coil wire itself first. My guess is that you had a spark problem all along and they mis-diagnosed it in the begining.
Posted on Jun 21, 2009
Chek sparking plugs they maybe covered with dirt .
Posted on May 31, 2009
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Posted on Jan 02, 2017
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Apr 22, 2015 | 1991 Volvo 940
Sep 29, 2012 | Volvo Cars & Trucks
Engine stall or RPM fluctuates
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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