Possible causes
– Faulty spark plug 1
– Clogged or faulty fuel injector 1
– Faulty ignition coil 1
– Fuel injector 1 harness is open or shorted
– Fuel injector 1 circuit poor electrical connection
– Ignition coil 1 harness is open or shorted
– Ignition coil 1 circuit poor electrical connection
– Insufficient cylinder 1 compression
– Incorrect fuel pressure
– Intake air leak
– Clogged or faulty fuel injector 1
– Faulty ignition coil 1
– Fuel injector 1 harness is open or shorted
– Fuel injector 1 circuit poor electrical connection
– Ignition coil 1 harness is open or shorted
– Ignition coil 1 circuit poor electrical connection
– Insufficient cylinder 1 compression
– Incorrect fuel pressure
– Intake air leak
Tech notes
The P0301 code means that the cylinder 1 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 1. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”
When is the code detected?
Engine Cylinder 1 is misfiring.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– Lack/loss of power
– Hard start
– Engine hesitation
– Lack/loss of power
– Hard start
– Engine hesitation
P0301 MERCURY 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.
MERCURY Technical Service Bulletins for P0301 code
1997 MERCURY MOUNTAINEER UNKNOWN OR OTHER
1998 MERCURY MOUNTAINEER UNKNOWN OR OTHER
1999 MERCURY MOUNTAINEER UNKNOWN OR OTHER
2000 MERCURY MOUNTAINEER UNKNOWN OR OTHER
2001 MERCURY MOUNTAINEER UNKNOWN OR OTHER
2002 MERCURY MOUNTAINEER UNKNOWN OR OTHER
1997 MERCURY MOUNTAINEER UNKNOWN OR OTHER
1998 MERCURY MOUNTAINEER UNKNOWN OR OTHER
1999 MERCURY MOUNTAINEER UNKNOWN OR OTHER
2000 MERCURY MOUNTAINEER UNKNOWN OR OTHER