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Hi Dave,
I bought my 940 two years ago and I got all of the service records
and an honest appraisal of some chronic unsolved problems. One was
the car suddenly quitting in what appears to be limp mode.
I had it occur and the car needed a little gas peddle to keep from stalling,
too much gas it would stall.
Is this limp mode where every other cylinder is shut down by EZK?
I swapped the CPS serviced the connector, repaired the AMM that had the output side screen disappear into the engine: new screen and service that connector,
and so far so good. That doesn't mean it's fixed though.
The CPS I took out was OEM and looked new. The coil checks OK with an ohmmeter.
Somewhere I thought that the tranny bell housing had a ground strap but I couldn't
find it in my new 1993 wiring book. The shield for the CPS is grounded only
at the EZK ECU. I would have thought that Volvo would secure a ground also at the bell housing. Maybe Volvo was afraid of a ground loop issue and toasting the ECU?
If so plan B would be to ground the bell housing end of the CPS harness shield with a bypass capacitor to shunt RFI.
I wonder if anyone has noticed their tach read offscale <6000 RPM
momentarily just before the engine shut down? This would be hard to catch.
What would happen if there was enough noise on the CPS signal wire that the gap where the ECU senses the crank position was filled with a spike?
Another way RFI might corrupt the CPS signal.
Do you know of more recent LH and EZK manuals ?
Probably something nixed by the Ford guys.
Bill
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