INJECTOR FAILURE 2.Injector filters become clogged.ĬAUSE OF FAILURE 2."Foreign particles" in fuel tank(s) or fuel lines, or fuel rail. INJECTOR FAILURE 1.Unburned fuel additives are baked on the injector pintle and orifice altering flow volume, altering fuel spray pattern.ĬAUSE OF FAILURE 1.normal use of vehicle but lack of fuel system maintenance after engine shutdown "heatsink" resulting in higher "baking" temperatures for unburned fuel and/or fuel additives remaining on injector overheating of engine (and the injectors) from faulty cooling system, improper engine timing, contaminated fuel, incorrect fuel octane, vacuum leaks.ĮFFECTS OF FAILURE 1.reduced engine power, sluggish pickup/performance, reduction of fuel econony, leaking fuel injector, potential for engine overheating, O2 sensor damage, remaining injectors/cylinders are overfueled to compensate for underfueled injectors/cylinders as the "closed loop" O2 system attempts to maintain stoiciometric ratio. Let's take a look at the potential fuel injector problems and failure modes of an injector, the possible causes of each failure mode, and the potential resulting effect on engine performance. An extraordinary duty demand indeed! If you consider your personal vehicle, and your driving habits, you can get an estimate of the service duty thru which they have been subjected.ĭue to the heat environment, the extraordinary duty demands, and the fact that, after all, the fuel injector is a mechanical and electrical part, the fact is, an injector is subject to problems, faults and failure.
So that at 2,000 RPM, the injector has operated 2,000 times. As mentioned on another page of this site, for a daily driver vehicle, (12,000miles/year), each injector will cycle approximately 18,000,000 times annually !! Recall, that the Jaguar V12 HE injector fires twice per engine cycle. It has to be, considering the extreme heat environment where the injector is located. The fuel injector, though small, is a very solidly constructed fuel system component part. (This is an internal page of the JAGUAR FUEL INJECTOR website)
Fuel Injector Problems, Faults and Engine Performance
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