1991 Ford Ranger enigine sputters and misses once warm

1991 FORD RANGER
90,000 MILES • 4 CYL • 2WD • MANUAL
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ZACH1537
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The truck runs fine until it is warmed up and then I get a check engine light. The truck then starts to miss and sputter and nearly stall when i give it gas. It almost seems like its running out of gas but instead of stalling, It backfires very badly when sputtering. It only does this over 2000 rpm. The tuck idles fine and runs great until its warmed up. I had previously noticed a decline in fuel mileage. Another thing is that if I shut the truck off and then start it up it will run fine again for a few miles.

I have tried a new MAF sensor and a new computer, neither helped. Both shops I took it to thought it was the MAF or computer.

The codes they were getting were low voltage to the MAF and ERG. Nothing about the fuel pump at all.

Could it be the catalytic converter or a bad coil? I was also wondering if its something in throttle body.

thanx -Zach
Aug 20, 2008 at 2:17 PM
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BMRFIXIT
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run a new ground wire to the intake manifold or engine from the battery and check the MAF sensor reading again
Apr 16, 2019 at 11:57 AM
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RENAUDTN
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okay, maybe I'm completely wrong, but you could have a bad coolant sensor that prevent your car from going into closed loop resulting in a rich mixture that eventually flood your engine when it gets warm.
An easy check would be to remove a spark plug and check it to see if it's wet. If it is that would indicate a bad coolant sensor or leaky injector.

That could also explain why your fuel consumption went up lately.
Apr 16, 2019 at 11:57 AM
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ZACH1537
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Tried new MAF, nothing changed, the codes came back for a EGR vacuum selanoid...does anyone think this could be causing all the sputtering and loss of power?
Apr 16, 2019 at 11:57 AM
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BMRFIXIT
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what do you have for codes

if EGR is stuck open engine will run rough and or stalling


what do u have for P codes
Apr 16, 2019 at 11:57 AM
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ZACH1537
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I dont know myself what the codes are, the mechanic told me the codes are comming back for the EGR. Tried a new valve and EGR sensor, nothing changed. Hes sayin it must be the EGR selanoid sensor. Would a bad sensor cause the problems im having? The truck doesnt idle rough at all.

Is there anyway the throttle position sensor would cause my problems? Only thing is it runs fine until the truck is warm then the check egnine light comes on and the truck sputters and has no power over 2000rpm. If I stop, it idles fine and the truck wont stall.

Another thing is, that when its sputtering and the engine light is one, if I shut the truck off and then restart it, the light goes off and the truck is fine for a another 1-2 miles.
Apr 16, 2019 at 11:57 AM
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BMRFIXIT
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it would be a better thing if we have them codes then we can target the troubled area.

ask them for the codes # and or check with your local part store if they have the service most of them they do have this service for free


where they hook the computer to your s and get u the codes
with out them codes its going to be a long road


get them codes need the codes
Apr 16, 2019 at 11:57 AM
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ZACH1537
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Ok I got the new EGR vacuum selanoid as the codes pointed to. The check engine light no longer is on or comes on.


YEt the truck is still doing the same things, now there is no error codes coming back yet the truck is getting worse, it only takes 1-2 miles before it starts having problems.

What could be that bad and yet not show up on a cpu scan?
Apr 16, 2019 at 11:57 AM
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ZACH1537
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One other thing to mention is that the truck is idleing at 1100rpm and the truck also wants to run at higher rpms than before.

Usually the ranger, in 5th gear, at 55mph ran at about 2200 rpm, now it runs at 2800-3000 rpm at 55mph. Even when its cold and not sputtering and misfireing it has no power and again, is running at higher rpms.
Apr 16, 2019 at 11:57 AM
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