Powertrain, generic (extended)

P22F4 Cylinder 7 Alternative Fuel Injector Control Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

Plausibility code for the cylinder 7 gas injector circuit: wiring passes the open/short checks, yet the electrical response of the valve does not match what the driver expects. No manufacturer documents this code publicly. For this cylinder, Ford's 2014 overview and the TransEco installer sheet for Ford V8/V10 engines contain just Low (P22F2) and High (P22F3) for this cylinder. The basis is CARB, which requires output components to be checked for correct functional response where feasible. Possible triggers would be a slow or sticking valve, often from compressor oil carried in natural gas, or a coil whose resistance has drifted. Expect intermittent stumbling on gas and possibly a misfire code for cylinder 7.

Likely causes

Cylinder 7 gas valve slow or sticking from oil residue
Injector coil resistance shifted with heat or age
Weak supply voltage to the gas injector bank

Symptoms

  • Intermittent stumble in gas mode
  • Misfire code for cylinder 7 possible
  • Check engine light possible

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–800
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alternative fuel injector

Related codes

P22F1P22F2P22F3P22F0P22F8P0307

References: law.cornell.edu, http:, performanceparts.ford.com.