P22E4 Cylinder 3 Alternative Fuel Injector Control Circuit Range/Performance

P22E4 points to a cylinder 3 gas injector whose circuit works but whose electrical behaviour does not match the command. Peak-and-hold gas injectors first draw a high opening current and then a lower holding current; Ford's patent US 8,161,946 treats an injector that stays at peak or ignores commands as degraded and reports this back to the engine computer. No maker documents P22E4 publicly. The code is distinct from pressure problems: GM's bi-fuel pickups regulate gas to roughly 896 kPa ahead of the rail, and a wrong rail pressure has its own sensor codes. Here the injector or its driver is suspect, often after oil or debris from the gas has made the armature stick. Cylinder 3 then runs unevenly on gas.

Likely causes

Symptoms

• Malfunction indicator lamp on
• Intermittent cylinder 3 misfire on gas
• Rising gas consumption

Repair estimate

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

Parts involved

Related codes

References: patents.google.com, static.nhtsa.gov, law.cornell.edu.