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1048888
I have a friend who had a similar problem with her 90 cherokee. I don't know if it applies to the 94, but
her problem was stalling for no reason at random. She said her temp guage would sometimes spike right
before it died. Apparently the cherokees have a problem with air in the coolant. If it's not filled properly,
or leaks, there will be air in the system. This air becomes super-heated (air compressible, fluid isn't, physics
stuff). When it passes over the temp sensor, the guage spikes and the computer shuts the engine down
(thinking fire? not sure why).
The easy fix is to run the engine and keep adding coolant till all the air vents. On my tj I put the front end
on jack stands, opened the radiator cap, and let the engine run till the thermostat opened. Let it run for
a while longer and keep adding coolant till the level in the radiator stops dropping.
Although, in your case, with the code 12 changes things. Do you reset the computer after you read the
code? If not, then you are seeing the same code 12 from the last time you disconnected the battery. If
you did reset it and got the code 12 again (without disconnecting the battery) then you may have a
loose power connection to your computer. Although I'd bet on the mass airflow sensor over the computer
power problem or temp sensor especially if the bumping is frequent and you haven't noticed the temp
sensor spiking.
Cooper.
[addsig]
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