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misfires, rough cold idle V50

posted by  hf63 on  Mon Aug 1 07:25 CST 2016
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last visit: Wed Oct 22 15:19 CST 2014
[RELATED]

Michael,

In older Volvo's 850 and 960's there is something call a power stage that controls the coils. On the 850's with a single coil, the power stage is on the ignition coil assembly Vs the 960 with direct injection no cap but 6 coils. This car has 2 power stages one for even number of cylinders and the other for the odd number.

Since your car has miss fires on all cylinders look into this as a possibility, not sure where it might be located on your car. 960 power stage is on the intake manifold by the front and rear side.






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