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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 11-28-2007
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need help bad

i need help, truck will turn over but it wont start. my guess is its fire/or fuel, but i just put a new coil pack on it (sceamin demon) not to long ago. but for the past few weeks its had some troble starting ,by that i mean it would crank right up but it would miss for a few secounds,but once it warmed up it would run fine and this morning i go to crank it and all it does is turns over. i tried to listin for my fuel pump and i can hear a very weak humming, but is there a posabilty that my fuel pump is bad . its a 1998 ford ranger 4x4 with a 4.0
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Old 11-28-2007
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Is there any fuel in the injection system? Any fire at the plug? Check those 1st, start ruling stuff out. You need fire, air, and fuel to make it run.
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Old 11-28-2007
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try not to use any starting fluid because that will cause extreme wear for a few min.
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Old 11-28-2007
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k i will try, how do i check to see if theres any fuel in the fuel rail
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Old 11-28-2007
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well i think my problem might be fuel, because i pressed the schrader valve on the fuel rail and only a little dribble came out. so i tried primeing it agian, same thing only a little dribble.so if the fuel pump was weak would that cause that .or what could cause that
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Old 11-28-2007
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I'd first rule out spark. Pull a plug, ground it, and have someone crank it. At least that way your not chasing your own tail.

I'd sure think youd get a spray on the schrader valve. But again.. I'd rule out spark. It won't take but 5 minutes and it's free.

Rich
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Old 11-28-2007
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Fuel pumps just go out after a while. Has it ever been replaced?
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Old 11-28-2007
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no never been replaced and it has 132,000 on the stock pump
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Old 11-28-2007
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check the resistance on the spark plugs wires, if they are good then I would chase after the fuel pump and as long as you are changing the fuel pump go ahead and change out the fuel filter.
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Old 11-28-2007
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i just did the fuel filter,about 2,000 miles ago so i now thats not a problem but they are like only 4.00 dollers so why not, but anyway i went ahead and took the bed off and im about to go pull the pump,so ill keep yo guys updated
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  #11  
Old 11-28-2007
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good
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  #12  
Old 11-28-2007
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well the pump is out and in my hands,but when i got it out of the tank i turned the key in the on position to test it and it made noise very low humm ,im not sure if it is just very weak, or if its still good then i have a problem some where other than that
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Old 11-28-2007
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I'm not sure about your truck. But there may be a relay that powers the pump.

Rich
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Old 11-28-2007
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ya there is but the pump is getter power
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Old 11-29-2007
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there may be a clog further up the line near the fuel injectors/fuel rail.
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  #16  
Old 11-29-2007
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true but im hopeing that is the problem,if not i have no clue how im going to fix a cloged line
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