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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 10-26-2010
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Sputtering engine problems

Hello,
I have a 98 4.0L V6 XLT truck, and recently it's begun to sputter when I'm driving it on the freeway. It's the same feeling as when you are almost out of gas, and running on fumes. Could it be the fuel pump? Is the fuel-to-air mixture off? It's been getting worse.
The guy I bought this truck from did not keep any records, so I don't know if he's ever replaced anything to do with the fuel system. It's got 118,000 miles on it.
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Old 10-26-2010
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try replacing the fuel filter first
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Old 10-26-2010
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Whereabouts might that be located?
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Old 10-26-2010
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near the back of the truck on the fuel lines...cant miss it
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Old 10-26-2010
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Thanks, I'll replace that and let you know how it goes.
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Old 10-26-2010
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Do a treatment of dry gas as well.

Mine had very similar symptoms as yours with the difference being that mine shut down on me about 500' from my house last winter. Long story short, moisture in the fuel system.
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Old 10-27-2010
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its on the driver side inside the frame rail is if i remember correctly underneath the driver door also sounds like it could be an electrical problems. i would also change my plugs and wires while your doing that might aswell do the pcv valve too... also dont get junk parts from autozone go with quality motorcraft or genunie ford parts esp. for the fuel filter
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Old 10-27-2010
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I'm gonna try a full tune-up; new fuel filter, spark plugs, wires, etc., and see how that goes. Found out that one of the cylinders was mis-firing.
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Old 10-28-2010
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If you don't find any apparent reason for the mis-firing, suspect blown head gasket as worse case scenario.
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Old 10-28-2010
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Let's hope not, but thanks for the heads-up.
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Old 06-14-2011
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Okay, so the full tune-up worked before, but now the sputtering and lagging has returned. At first, it was sputtering when I'd come off the freeway onto city streets, but now it's happening intermittently. Went for a long drive this weekend (about 500 miles r/t) and it would act up whenever, no consistency.
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