Let us all chant together: CRANK SENSOR
My '91 Park was famous for it. It would run for an hour or so until it got hot,
and then it would conk out. Wait about an hour for it to cool off, and then it
would start again. The crank sensor stays good for the first eight years or so,
or until it gets a little coolant spilled on it, then it gets intermittent.
I no longer own my '91 Park, and I don't remember perfectly. It seems to me
that it was below the water pump somewhere. As I recall, if the water pump
leaked any coolant out of the weep hole, it went onto the crank sensor, and
that is what contributed to a failure. You have to get the Helm manual if you
want accurate details.
It's just below and behind (rear of) the water pump. Also look at the
wiring in this area! A shafed through wire will cause the same symptom -
the engine temp cause aexpansion/contraction of surround materials.
The crank sensor mounts behind the crank pulley. You may need a special
tool to align the sensor properly. This car has an ignition module, but
I'd save that for a second guess. It's much more expensive than the crank
sensor. The ignition module is under the coils.
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