1999 Ford Ranger Bucking on high speed

1999 FORD RANGER
133,000 MILES • 3.0L • V6 • 4WD • AUTOMATIC
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NINA1045
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  • 3 POSTS
After auto hits 50 mph and higher, vehicle starts to buck until you go below 50 mph
Oct 7, 2014 at 5:10 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Is the check engine light coming on when this happens? Does it ever do it at lower speeds, or when climbing a long hill?
Oct 8, 2014 at 5:32 PM
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NINA1045
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  • 3 POSTS
No the light does not come on, it did before changing the speed sensor, now the light is off and the bucking after 50 mph is going on, changed plugs, wires, and speed sensor.
Oct 8, 2014 at 6:35 PM
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JACOBANDNICKOLAS
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  • 110,190 POSTS
Has this problem just started since the VSS was replaced? If so, is it shifting properly? Is the speedo working properly?
Oct 9, 2014 at 5:23 PM
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NINA1045
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  • 3 POSTS
No, it did it before, the first speed sensor was broke, it was replace and is fine, the bucking was before that's why we changed it.
Oct 10, 2014 at 7:47 AM