Question about 1992 Cadillac DeVille

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92 deville-speedo jumps around wildy while going down the road

When it hits 0 the engine races and the car is out of gear. when a speedo reading comes back up it is in gear again. is this to hard to fix myself and what is broke?

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Speedometer drive gear stripped or cable binding

Posted on Jun 22, 2009

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1 Answer

Speedometer jumps from 55 to 0 while driving


speedo drive on it's way out normally gear on drive worn or missing teeth

Mar 14, 2014 | 2003 Cadillac Deville

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Code P0736, P0731, P0720, P0700


Well code 700 is a generic code that means there is a problem with the transmission or the control module.
Code 736 is an incorrect gear ratio for reverse, code 731 is incorrect ratio in first gear, and 720 is the code for the speed sensor which involves the engine computer as well as the speedo.
Its possible the speed sensor is causing the other codes.
I would have a shop check the speed sensor circuit, clear the codes, and see how many come back then proceed with more testing as needed.

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I have a 91 F150 4x4 4.9l 5sp. The speedometer seems to function properly at low speeds (0-40mph) but the faster I travel the more inaccurate it apears to be. When I'm on the fwy my speedo reads 75mph in a...


Hello, I had a similar problem, there is a race? in the transfer case that has a plastic gear molded onto it and it is worn down. The guy that worked on my transmission replaced it when my speedo was jumping around and causing the transmission to shift at the wrong times. He has a hard time finding the part !!!! since it was replaced I have had no problems. hope this helps

Mar 14, 2011 | 1991 Ford F150

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I have a 2001 taurus,DOHC,24 valve.....At first the car would surge real bad,like when you pull up to a stoplight it would jump and idle rough and die,,,,Ive changed the tps,DPFE sensor,the EGR vaccum...


You do not mention any testing, the transmission and engine are fully electronically controlled, have the system scanned for fault codes as a first step in repair.

Apr 21, 2017 | 2001 Ford Taurus

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Speedometer on 92 regal is jumping between numbers that don't make any sense! Could this be a ground?


This is likely a faulty speedometer unit. They use very small drive gears and if the gears become worn or chipped (just through normal service) it will become very erratic at your most common speeds and will probably calm down as you accelerate. Let me know what else I can do for you.

Apr 22, 2010 | 1992 Buick Regal

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Loose speed when going down the road


Sounds like a cv joint has failed. Have you ever noticed a clicking sound while turning and the car is in motion? If so, I am almost certain that one or all of the cv joints have failed. If this proves to be the case, it is a complicated repair and should be referred to a competent and certified mechanic.

Sep 26, 2008 | 1999 Chevrolet Lumina

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