Question about 1993 Ford F150 SuperCab

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1993 ford f150 w/ l6 engine won't idle/accelorate rite

I have a 1993 ford f150 2wd w/ a L6 engine i start it and it sputters to stall and if i nurse the gas peddle it'll stay running and after a fiew mins itll stay running for a bit but then gets rough again and eventually stalls sounds like it's backfireing into the exhaust and the rpms surge. if i open it up on the highway it's fine untill i get back down to in town speeds. then again sometimes it completely clears up and runs fine.. no check engine light comes on or anything. ive pulled the air bypass valve apart and cleaned it on the advice of others and it didn't help. tapping the map sensor on advice of others didn't change anything either. blocking egr valve off didn't change anything. and as far as i can figure there is no MAF sensor anywhare between the air cleaner and the air intake.. i have no clue what else..


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  • WILDFIREGOD Nov 04, 2008

    I pulld the codes from the computer and theye were as follows w/ the engine off and the key in the on position i got 33-EGR open not detected, 332-EGR valve open not detected, 334-DPFE or EVP circuit above closed limit of 0.67V, 556- fuel pump circuit fail(wich to me don't make sence but then again im not a and with the engine running i got 412- cannot controll RPM during KOER high RPM check, 116-ECT out of self test range 0.3-3.7V 172 HEGO sensor indicates system lean (right side), 538-insuficient rpm change during dynamic response test, 536-break on/off circuit fail/switch not acuated during KOER test, 632-overdrive cancel switch not changeing state.

  • Anonymous Dec 20, 2008

    Is the bullet connection for the Check Engine/EEC Reference Signal wire connected at the Negative Battery Terminal?

    Some 'mechanics' aren't fully aware or trained about Ford EEC (since 1980!) that the EEC NEEDS that reference to the ground/Negative terminal! So, they do some maintenance, unplug a connector, and here is the result!

  • jesse_b37 Mar 11, 2009

    i have a 1993 ford f150 supercab 5.0 engine that runs rough when idling if i nurse it it will run ok but when i step on it it boggs out

  • michaelbe624 May 11, 2010

    Did you try changing your fuel filter?



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Unplug the engine coolant temp sensor. 1 for the ecm, not the gauge. It may be way off and causing engine to run very rich, thinking it's cold all the time. At highway speed, you're using enough to get by. If not the answer, uplug MAP sensor and try that. It could think you're in outer space or way below see level. It's black rectangle with vac hose going to it. boo switch and o/d cancel switch errors were likely you not actuating them during koeo test. Others could have been cause by other previous.

Posted on Mar 28, 2009


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