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Re: p1391 diagnostic code
The code is for intermitent loss of cam or crank sensor...one of the sensors maybe going bad or i have run into the wiring where it comes over the rear of the engine chaffing at the valve cover causing the loss of the signal
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DIAGNOSTIC TROUBLE CODE (DTC) P1391: "INTERMITTENT LOSS OF CMP OR CKP" This DTC is monitored with the engine cranking or running. This DTC will be stored in the Powertrain Control Module (PCM) when the PCM FAILURE COUNTER reaches 96 failures for 2 consecutive trips. Posiible causes are: Craknkshaft Position (CKP) sensor improperly installed, defective CKP sensor, defective distributor, defective Camshaft Position (CMP) sensor, defective PCM, defective or broken flywheel, defective connectors or defective wiring. Proper diagnosis is recommended before replacing ANY parts.
Here are the meanings of these codes.
P1391 FORD - Glow Plug Circuit Low Input Bank #1
P1393 FORD - Glow Plug Circuit Low Input Bank #2
I think you most likely have a burnt out Glow pug controller. Whenever this controller is replaced all glow plugs should be tested for proper function.
Hello my name is brad,a code p-1391 is a crank sensor code or the cam sensor..check wiring connetors at crank sensor or at cam position sensor,do you have a car or truck or mini van and what size engine.i hope this helped brad