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Serious miss, almost like dropped cylinder, No

Serious miss, almost like dropped cylinder, No codes. shop says fuel injector but want 500.00 to change.I do not know fuel injection at all. I quit wrenching before injection. I can buy a set of injectors but isn.t there some electrical components to the ford 5.0 system? field coils etc.

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  • Lloyd Hudson May 15, 2009

    thanks, yes there is spark, I was going to check plugs physically (time anyhow) probably 50K on them. I quit wrenching way back when but still have tools. I just did not want to spend a couple of hundred on injectors then find that there are other compnents. diesel injectors were mechanical but I do not know anything about these electrical ones. the catalogue pictures for the injectors did not show much in way of components. where does the timing for the electrical come from?

  • Lloyd Hudson May 16, 2009

    All comments were excellent and yes, you guys did answer mmy questions. 1990 F-150 5.0, 180,000 miles.

  • its420_us May 11, 2010

    Your timing is all electronic controlled, with the vehicles computer, cam and crank sensors. There are no adjustments you can make. Injectors are simple, and your mechanic may have anaylized it correctly.

  • yadayada
    yadayada May 11, 2010

    what year and what engine, Generic is not enough info.

  • its420_us May 11, 2010

    Check your spark first. If you're getting spark to all cylinders, you're good there. If you wrenched before fuel injection, you can easily do this yourself. Disconnect your negative battery cable, then remove the retaining bolts on the fuel rail and lift it up. The injectors are sealed with rubber "O" rings, a wire clip attached, and thats it. Much easier than the old days.


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I don't know what year your ford is but most of them have the injectors mounted externally. There not bad at all to do. Vehicle off, release fuel-line pressure, remove the bolts holding down fuel rail, pull the injector/s out of the head, lap injector o-ring with motor oil, install new injector/s into head. lap top o-ring with motor oil, install fuel rail, start vehicle, and check for leaks. If you are only replacing a few injectors do buy new injector o-rings for the other injectors. You will not be able to push the fuel-rail back onto the injectors without replacing them (they will be swolen).

Posted on May 15, 2009

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