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overdrive

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Old 01-27-2005, 12:55 AM
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overdrive

got a 1991 f350. the overdrive switch in the cab is blinking, and the trany is shifting realy hard. any comments?
 
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Old 01-27-2005, 05:49 AM
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I believe that is like the check engine light, but for the trans. I wouldn't drive much until you find out the problem. A trans can be expensive.
 
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Old 01-27-2005, 09:03 AM
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The flashing light is a warning light, correct. Do your Tach and speedo work. Have you checked fluid level/condition. Have you reset/tested your (TPS) FIPL.

Do the FIPL setting, if no change post back..........
This is a post by DieselDon I have taken the liberty to trim slightly.......
Hook up the negative lead of a volt meter to the battery ground and the positiove lead to the center GY/W (grey/white) wire which is the FIPL signal wire. I use a paper clip up the side of the wire in the connector. The FIPL must be attached to the wiring harness. Engine low idle speed must be set to specs prior to adjusting the FIPL.
With a warm engine, key on, engine off, measure the voltage at the GY/W wire, if adjustment is required loosen either the bracket with bolts or just use the slack in the Torx screw holes. Now gently rotate the FIPL until you get some where between 1.05V and 1.1V. then tighten the torx screws or bolts which ever you loosened ensuring no movement of volt setting. Rotate the throttle lever slowly to WOT see if you get 3.8 V but not more than 4.3 V. Watch for any dead spots.
The large FIPL mounting bracket can be moved but ensure it is centered for a good rotation. Any adjustment should be made by only rotating the FIPL. If a new FIPL is required, check tang engagement as you take off the old FIPL and then make sure that the tangs in the new FIPL engage the throttle lever properly.
The closed throttle voltage: 1.1 V, ...wide open throttle voltage: minimum of 3.8 V but not more than 4.3 V.
More info....
Early Black FIPL has High Failure Rate
RECOMMENDATION
Always replace the black colored early FIPL or any colored FIPL having 60 thousand or more miles with the late gray colored FIPL.
PART NUMBER
F2TZ-9B989-C
 

Last edited by PLC7.3; 01-27-2005 at 09:07 AM.
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