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2003 Ford F-150 Lariat 5.4L Poor Idle Quality, Misfire, MIL Lamp on
Posted to Ford Driveability on 8/25/2021 10 Replies

I first looked at coil ramps all good! Then at injector ramps all good. The leak-down test looks good, relative compression looks good. In-cylinder pressure looks good although I am new to this type of test. Removed valve cover to inspect lash adjusters th...

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  Related Documents & Media  2003 Ford F-150 Lariat

 
Message Closed w/FIX

car Vehicle Data

2003 Ford F-150 Lariat

VIN 1FTRX08L93
Engine5.4 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursCold

Trouble Codes

P0301Cylinder 1 Misfire Detected
P0316Misfire Detected On Startup (Within the 1st 1000 Revolutions)
Message Closed w/FIX

car Vehicle Data

2003 Ford F-150 Lariat

VIN 1FTRX08L93
Engine5.4 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursCold

Trouble Codes

P0301Cylinder 1 Misfire Detected
P0316Misfire Detected On Startup (Within the 1st 1000 Revolutions)