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Mercury Sable 1990
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Hello! I’ve been restoring a 1991 Mercury Sable. It is stalling at low speed. I’ve changed the MAF sensor, the Throttle Air bypass valve, the TPS sensor, the ignition coil, the distributor cover, distributor rotor, spark plugcables.

I detected that the CCRM Constant Control Relay Module was vibrating and the check engine light was flashing rapidly while the engine stalled. E9DF-12B577-EB

Thoughts? Any one has experienced the same? Could it be the fuel pump?
 

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There's a way to read OBD 1 codes, leave the key on when it stalls and read it. That's not particularly helpful, and I wish I actually could remember the exact process that you have to do (I have never owned an OBD1 model of these), but once you can find out the code it will at least give you some direction.
 
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