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Backfire through intake no accelleration, reset to normal by turning off and on ignition switch

94 F250 5.0 backfire through intake no accelleration, reset to normal running by turning off and on ignition switch however normal run doesnt last very long. Changed EGR position sensor, EGR solonoid, fuel filter problem is semi random, just more on the problem side, rarely do you come to a complete stop and are able to take off again without reseting by turning off/on ignition. when problem happens at full speed, shift to neutral, turn off/on ignition fixes problem for about a minute or two.

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  • David Nov 07, 2012

    got a new Mass air flow sensory,.. still the same after engine gets warm, drives like **** with mass airflow sensor plugged in, unplugged drivable just hard shifts at every gear... i'm scratching my head wondering if i should take it back to the shop and told em i've spent 200 dollars fixing what they told me to fix, plus somethig they didnt tell me to fix, now what



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This sound electrical like bad coil or even timing as when it backfires the sensors put it into limp mode which usually resets itself when turned off and restarted. Take the truck to Autozone and get a free diagnostic reading and when they plug it in it will give you a trouble code. They will tell you what the trouble code means or you can enter it in your search engine and you will get lots of info on what it could be with probably lots of other people that had the same issue and how they resolved it.

Posted on Nov 05, 2012

  • 3 more comments 
  • David Nov 05, 2012

    This truck is OBD1. Check engine has been coming on and off as it pleases. Turn of ignition always resets any lights

  • David Nov 05, 2012

    Took to favorite shop Cleared codes Code: EGR sensor too high. Didn't realize there'd be codes stored. when messing with the EGR valve itself (side of throttle body) it seemed to be moving up and down no problem Autozone won't read OBD1. will let board know final solution if there is one

  • David Nov 05, 2012

    Took to favorite shop Cleared codes Code: EGR POSITION sensor too high. Didn't realize there'd be codes stored. when messing with the EGR valve itself (side of throttle body) it seemed to be moving up and down no problem Autozone won't read OBD1. will let board know final solution if there is one

  • David Nov 06, 2012

    OK.... Shop codes. 2 of them. EGR position sensor too high. Shop said said EGR sticking? Other code was throttle position sensor no voltage output or something to that effect.

  • David Nov 06, 2012

    Sensor was cheapest.... Had to remove throttle body to access Philip screws on bottom of bottom intake. After changing the sensor truck ran completely different. No backfiring. Back to original problem of having trouble getting to 30 though. Decided to change EGR. I don't think that did a thing. For some reason decided to disconnect MAF. when I did this under the backfire condition it would stall but now. Hard shift but runs great. I think combo of fixing throttle position sensor and disconnecting MAF does the truck. Tried cleaning MAF with MAF cleaner but didn't work. I believe running the truck originally under the struggling MAF damaged the other sensors and whatnot as they were trying to compensate for the bad MAF. If your vehicle just having trouble getting to 30. Try disconnecting the MAF sensor. I will let board know how truck runs with new MAF sensor in it when I get it.



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check the fuel pump first.after that check the fuel filter. probably it is clogged.these parts are loacted in your fuel tank floater.remove the back seat.remove the screws.your car is young so the crankshaft position sensor must be working properly.

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