speedometer issue om 91 f150
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speedometer issue om 91 f150
I live in Michgan and the past 2 winters the speedometer quits working in the winter, and starts again in the spring! There is a cable and wires coming out of the back of the trans, I am guessing the cable drives the odometer and the speedometer is electrical? I have checked both, the electrical connector and the cable, they both seem fine. has anyone else had this issue?
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well it is a 4x2, has the 300 6, and has the 4 speed auto (3+overdrive). The funny thing is the speedometer will jump around, from maxed out back to somewhere near the speed I am driving, to maxed out. yet, the odometer still works. That is one of the reasons I thought they worked differently.
Lead Driver
Joined: Nov 2002
Posts: 9,557
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From: Concord, NC
It sounds like the cable is sticking, winding up and then popping free. When it pops free, the speedometer end unwinds faster than the steady speed on the transmission side causing the speedometer needle to surge to much higher speeds than you're actually traveling.
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yeah, I understand how that would happen. But, my speedometer spends most of the time maxed out, or at least above the speed I am actually going. I will pay closer attention to it tomorrow. If that is what is happening, would a shot of wd-40 help? what else could I do? thanks
Elder User
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This issue was fairly common in the 50's and 60's vintage cars.
The solution then was to pull the cable out of the sheath, wipe it clean as possible, then grease it generously , and reinstall it.
Check the cable for damage while you have it out.
Good luck Frank
The solution then was to pull the cable out of the sheath, wipe it clean as possible, then grease it generously , and reinstall it.
Check the cable for damage while you have it out.
Good luck Frank
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
But, my speedometer spends most of the time maxed out, or at least above the speed I am actually going.
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yes this only does it in the winter. my guess is moisture gets in there and freezes. It will be fine by March or April, if I don't fix it before then. I just think it is funny that when I am going 5mph in a parking lot, the speedometer is maxed out! Also the odometer still works and is accurate.
Tuned
Joined: Apr 2003
Posts: 394
Likes: 13
From: 13th Colony
Similar problem
My speedo has periodically bounced at speed. This morning, it was bouncing worse than normal and then began buzzing loudly and wrapped back around to the peg. It would return to 0 when stopped and then pick back up to the buzzing after about 35mph. It also hung around 5-10 a couple of times when stopped and a quick whack to the dash made it drop back to zero. The ODO seems to be working fine. Has anyone sucessfully repaired this problem? Can you disassemble the speedo head independantly from the ODO? Would lubing the speedo solve the problem? I plan on lubing the cable, but wanted to know if the speedo needs work while I have it out.
90 f150 4x4 AOD
Thanks,
BroncoBasher
90 f150 4x4 AOD
Thanks,
BroncoBasher
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