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Hi Duck,
I heard many people say that they need OEM Crank Position sensors.
What's different about the OEM and aftermarket CPS?
My guess is OEM & aftermarket sensors CPS are likely the same except
that aftermarket cut corners with crappy shielding for the critical
RPM signal wires to the ECU exposing the ECU to corruption from
EMI (noise) from the ignition.
When my 940 started acting up I swapped out the CPS with an after market,
and also serviced the AMM and both connectors, and so far so good.
(Servicing connectors needs a separate thread with some discussion
about using dielectric silicone or zinc paste / Penetrox)
The RPM (CPS) and AMM signals are two key inputs to the ECU's.
I speculate that if the engine management is corrupted by bad shielding
of the CPS harness, that can be addressed easily by adding snap ferrites
or wrapping the CPS harness in aluminum foil. (info gained from practical solutions for killing TVI from nearby high power ham radio stations)
Aging filter caps are more likely to make ECU's more affected by ignition noise.
I can't pull my ECU to replace the caps now as I haven't recovered from a shoulder replacement but it's on my bucket list.
Brickboarder Amarin has a nice post about ECU service, does anyone think
ECU's are a perpetual machine?
If my 940 suddenly lapses into limp mode again, My plan is to first get any
OBD codes, then disconnect the battery for ten minutes to clear the ECU
and see if things change.
Comments?
Bill
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