Possible causes

– Faulty spark plug 10
– Clogged or faulty fuel injector 10
– Faulty ignition coil 10
– Fuel injector 10 harness is open or shorted
– Fuel injector 10 circuit poor electrical connection
– Ignition coil 10 harness is open or shorted
– Ignition coil 10 circuit poor electrical connection
– Insufficient cylinder 10 compression
– Incorrect fuel pressure
– Intake air leak

Tech notes

The P0310 code means that the cylinder 10 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 10. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”

When is the code detected?

Engine Cylinder 10 is Misfiring.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/loss of power
– Hard start
– Engine hesitation

P0310 FORD Description

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.