94 4.0 has a weird miss fire - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 12-22-2011
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94 4.0 has a weird miss fire

So when i warm up my truck in the morning i have no problem. But if i leave my truck in a parken lot for about 30mins ill start it back up and it has a bad misfire and the truck wants to die, but when i revd up the motor for a second it went away, Whats goin on it dos it a random and iv checked my plugs and intake and it just fine. any ideas
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Old 12-22-2011
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An injector partially stuck open would dump the remaining fuel in the fuel rail until the pressure went down.
With a cold engine, the fuel would have had time to evaporate and not cause a problem.
A warm engine, just shut down for a short time would have gas sitting in the intake causing too rich of a fuel/air mixture.
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Old 12-22-2011
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Quote:
Originally Posted by OTRtech View Post
An injector partially stuck open would dump the remaining fuel in the fuel rail until the pressure went down.
With a cold engine, the fuel would have had time to evaporate and not cause a problem.
A warm engine, just shut down for a short time would have gas sitting in the intake causing too rich of a fuel/air mixture.
Mine does this occasionally.
Try some Injector cleaner, i recommend Lucas Oil. i do it about every 6 months, keeps them clean and lubricates the lifters.
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Old 12-22-2011
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You know that really sounds about right, cus i just put in some EFI cleaner about 2 days ago and it still acked up last light, but today i had no problem. So that must had been it, , And yep i always like to run that lucas even now and then
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Old 12-27-2011
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Are you talking about the regular lucas oil or do they make a fuel injector cleaner?
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Old 12-27-2011
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I get slightly better mileage running this stuff, but my truck idles better with it. I suggest getting a gal jug if you can find it, it has the best price.


http://www.lucasoil.com/products/dis...el%20Treatment
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Old 12-27-2011
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yeah its good stuff. but today it did it again i went into town and left the truck for about 40min and i went to start and it had a really ruff idle like i had one dead cylinder, Should i try another bottler orrrrr whats next
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Old 12-27-2011
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How long has it been since you put the bottle in the tank?

I have a gallon of the stuff, and i have a little bottle to pour it into when i go to the gas station, its just easier that way, lol.
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Old 12-27-2011
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umm i think about a week
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