check engine light
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Joined: Jun 2014
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check engine light
Hi all i hope someone can help me with this problem. i have a 1994 F250 two wheel drive with a 5.0 the check engine light keeps coming on and off after about 10-15 miles of driving when it comes on seems to run OK but as soon as the light goes out i have no throttle at all unless i mash the gas then it seems to down shift and all well until a minute later then light comes back and my mileage is getting bad on here is what i have recently done i have replaced both positive and neg cables replace the temp sensor at the t stat checked and repaired a vacuum line checked all wiring and just two days ago i change the tps sensor for the third time because all troubleshooting pointed at failure again and replace the idle air control i cannot pull up any codes either by machine or the old fashion blink code method so i am at wits end in finding the problem i don't just want to change parts as this can be costly any help is greatly appreciated Thanks in advance Ed
Postmaster
Joined: Nov 2011
Posts: 3,533
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From: SW Florida
Try cleaning the contacts in the plug where you're connecting your code reader and/or jumper wire. Sometimes they get a little oxidized and won't make a solid connection, and when you're working with low voltage signal circuits you need everything shiny bright and clean!
Try it and get back to us, if it don't work then we have other things to look at next.
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Joined: Jun 2014
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CEL
i have check and double checked all connections pertaining to this on going electrical issue is there a way to plug into this system to run a check on the computer without pulling it out of the truck to ensure it may be the problem or pull it and take it some where? the other question is if bad do i get a new one with the numbers on it or what as someone posted they were changed in this truck year thanks again for any and all help
Fleet Owner
Joined: Aug 2005
Posts: 23,668
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From: Easton,Ks
Sounds like bad caps in the computer.
Yes you should go by the enganeering number on the computer. Should start with something like F4T or F3T.
If you do not have the numbers you can post back your calibration code off the drivers "B" pillar and you we will try and look them up for you.
Yes you should go by the enganeering number on the computer. Should start with something like F4T or F3T.
If you do not have the numbers you can post back your calibration code off the drivers "B" pillar and you we will try and look them up for you.
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