P0320 - Ignition/Distributor Engine Speed Input Circuit Malfunction
P0340 - Camshaft Position Sensor Circuit Malfunction
P1391 - Intermittent Loss of CMP or CKP
These codes are all related so I'd be looking at what they have in common. Both sensors share a common 5.0 volt or 8.0 volt feed circuit and a common ground return wire to the Engine Computer. Other sensors share the ground return wires, and since they're not setting fault codes, start by examining the wiring to the cam and crank position sensors.
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Monday, April 14th, 2014 AT 12:46 PM