How do you know when your fuel injectors are bad?


Asked by Dec 12, 2014 at 04:07 PM about the 1987 Ford F-250 STD Standard Cab LB

Question type: Maintenance & Repair

Tuned the engine but have not done anything with the EFI system/injectors. The truck is spitting and missing ever so often (usually between 25 to 40mph. The engine is a 4.9 with and inline six....manual trans.....any help would be appreciated. Thanks!

3 Answers

Tom Harmon

Try that speed in different gears ... if the engine begins to miss in a higher/lower range that should be a clue. Try starting out in second gear ... see what loading the engine does. I suspect if those injectors are 1987 they are ready for a good cleaning or a change. Geez ... I did not think fuel injection came out on Ford trucks until a few years later

Best Answer
Tom Demyan

Start with cap and rotor, and plugs and wires if the truck is missing. Replace PCV, Air and Fuel Filters while your at it. Fuel injectors are probably fine.

1 out of 1 people think this is helpful.

I did a complete tuneup and all these items were replaced. Maybe I should just clean the injectors and see what it does...thanks!

1 out of 1 people think this is helpful.

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