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1991 F-150 No Power in OD


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pawpawjam
New User

Aug 21, 2006, 1:01 PM

Post #1 of 6 (1937 views)
1991 F-150 No Power in OD Sign In

When my F-150 Lariat 5.0 liter automatic shifts into final gear (OD I believe) the RPM goes way down and I don't have any 'real' top-end torque left. I have to pump the gas to get it to down shift before I can accelerate with any power or I have to turn off the OD. I can't tell if this is a transmission thing or an engine thing. Any thoughts? I'm up to date on recalls since the fuel pump (or pick-up?) replacment.


way2old
Veteran / Moderator
way2old profile image

Aug 21, 2006, 4:07 PM

Post #2 of 6 (1933 views)
Re: 1991 F-150 No Power in OD Sign In

Look at the bushing on accelerator linkage. There is a plastic bushing that wears out and causes lots of funny trans problems. It goes to the TV cable to the transmission.



Being way2old is why I need help from younger minds


pawpawjam
New User

Aug 22, 2006, 9:30 AM

Post #3 of 6 (1930 views)
Re: 1991 F-150 No Power in OD Sign In

OK, help me out here. The accelerator linkage bushing potentially causes transmission problems? What is aTV cable? I'm not questioning your logic but it helps me if I know why.

Also, I didn't mention that the transmission shifts into final gear (OD) way early and shifts out of OD late (in my opinion, if that helps).

Thanks for the reply - I may not understand it but I do appreciate it.


way2old
Veteran / Moderator
way2old profile image

Aug 22, 2006, 9:43 AM

Post #4 of 6 (1928 views)
Re: 1991 F-150 No Power in OD Sign In

On your vehicle shift points are determined by pressures. The TV (Throttle Velocity or as commonly known, "kickdown") cable controls the valve that gives the pressure to shift. So if the cable is not operating properly, the transmission will not shift at the proper times. If the bushing is worn or missing, it changes the adjustment on the cable. I hope this has cleared it up a little for you.



Being way2old is why I need help from younger minds


pawpawjam
New User

Aug 22, 2006, 10:15 AM

Post #5 of 6 (1925 views)
Re: 1991 F-150 No Power in OD Sign In

Yes, that does help. Thank you for the explaination. I will check that out. Does this still hold true if it only happens when shifting into OD? It seems to shift fine otherwise. I also look to younger minds for help but wisdom comes with age!


way2old
Veteran / Moderator
way2old profile image

Aug 22, 2006, 5:32 PM

Post #6 of 6 (1923 views)
Re: 1991 F-150 No Power in OD Sign In

See if your cable has a small square plastic lock around the cable just at the throttle linkage. If it does, open throttle wide open, release the little locking clip and let cable slide till it stops. Then lock it back in place. This should help with the shifting.



Being way2old is why I need help from younger minds






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