Question about 1998 Ford Ranger SuperCab

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Runs rough and Terrible Mileage

My '98 Ranger with 4.0-V6 runs rough and gets about 12mpg. I have replaced nearly every emmisions sensor (MAF,MAP, all 3 - O2, air temp, TPS) and manually cleaned the injectors. I've replaced the plugs and wires ~2.5 years ago. I don't get any codes and even my local dealer doesn't get any codes from it. (Strangely enough, I replaced the TPS on a whim which they said was fine and got rid of some transmission problems.)

Some electrical interferance (popping/clicking with engine speed) shows up in my radio, but I don't know if that is related.

My father had the ECM on his '93 F250 go bad and showed no codes. Is this common on the '98 Ranger as well? Anything else to look for?

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  • derfthemule Jul 08, 2008

    I have teseted the EGR valve and replaced the pvc valve. Since the noise in the radio is getting worse I think it is in the ignition, a bad plug, wire, or coil (uses 6 coil distrubuterless ignition).

  • Anonymous Jul 10, 2008

    i have a 1996 ford ranger xlt and only runs on 3 cylinders can u help me

  • derfthemule Jan 21, 2009

    I have considered that the catalitic converter might be bad. At this point, new one would cost as much as the vehicle is worth. The clicking and popoing still comes and goes. Still don't know and too afraid to invest much more in it.

  • derfthemule Apr 10, 2009

    The rough running comes and goes now with only one apparant reason. I recently bought higher quality gas (claimed w/o ethanol) now the idle seems much smoother. The interference in the radio comes and goes, but I am leaning towards the alternator wearing out. Some bearings near the belt are squealing. Replaced both tension pully and idler pully on a whim. Both were OK, but going bad. See comment above about the coil. Don't know how to check primary and secondary coils on a distributerless ignition.

  • derfthemule Aug 29, 2009

    I replaced the coil and discovered that the #4 plug wire was defective when I put it on 4 years ago (Bosch Premium). The coil end was highly corroded and broken from not getting firm contact at the connector. It was hard to get on, but I thought the clip would hold it in place. No such luck. Replace the wires if it will not connect without the plastic snap-lock when new.

    New wires and no problem. It's one of those "ya, I feel stupid errors," but the Ford dealer couldn't diagnose it either. They replaced the #4 plug instead.

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Not sure if anyone has helped you on this one, but try a few things to kinda elimate some causes.
1) pull the plug wires one at a time to see which cyclinders aren't hitting
2) you can check the resistance of the coil on both the primary and the secondary sides for correct resistence
3) check the wires for shorts etc, which prob aint the wires
4) you can do a compression test on the cyclinders that aint firing
5) if all those pass ohmn the injectors all of them, on a 98 not sure what the reading should be but my 92 is .15 and anything within a few ohmns within each other or they read nothing replace those injectors.
I just replaced all 6 on mine solved my no fire issue in cyc 5 and now the mis has came back. I've yet to dive in to start my checking all over again. but here's another place to look, there is a ignition module on the truck think it should be near the battery.

Posted on Apr 10, 2009

  • imbackagaink Apr 10, 2009

    you can run a vacuum test to determine a intake leak, and do a vacuum test on the egr to see if it's sticking open which wil cause a mis as well,

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Try the egr valve,and pcv valve

Posted on Jul 07, 2008

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You need to check the intake manifold gasket and if that is fine check your upper intake maifold , where the egr valve connects it might have melted down and that is all caused by a faulty catalytic converter i have a 98 ranger and had/have the same problem

Posted on Jan 20, 2009

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