Question about 1991 Ford F250
Check to see if the computer is getting proper voltage on the yellow wire if that is not it ckeck the large red wiresmy dads truck had this problem last year the yellow wire was defective in the harnes the tack and the transmission work off the computer trust me it is a simple fix run a new wire from the solinoid on the pasenger side to the computer relay on the driverside and replace the relay too
Posted on Nov 10, 2010
These are two separate issues, the 1st the tach is most likely the tach is defective, this is fairly common, the 2nd problem requires that u have the transmission control module tested for fault codes, anytime the OD light flashes it means the transmission control module has detected a problem in the transmission operation, this can be a shift error or More commonly excessive slipping has been detected, u may not even fell this but never the less the difference between the input and out shaft speed sensors of the transmission showed a speed difference that triggered the OD light and a fault code, not saying this is the problem but based on my experience of 35 years at a Ford dealer it is the most common fault, if that is the problem then the transmission will require a rebuild. THERE ARE MANY PROBLEMS WITH THIS EARLY E4OD, LATER VERSIONS HAS BBEN GREATLY IMPROVED.
Posted on May 30, 2010
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Posted on Jan 02, 2017
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