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Old 04-29-2011, 09:33 PM
Registered User
Join Date: Jan 2005
Location: Red Boiling Springs Tennessee
Posts: 207
Speedometer jerking around

This morning I was driving to Nashville and I noticed my speedometer was jerking around at about 65 mph. I slowed down & sped up, but it still continued. It finally return to normal and has been acting right since then. Does this mean that my speedometer, or cable, is about to give me some trouble? Thanks.

hsmith 1984 190d W(201) 100,534

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Old 04-29-2011, 10:59 PM
scottmcphee's Avatar
1987 w124 300D
Join Date: Mar 2008
Location: Edmonton, Canada
Posts: 1,539
Short seizure of some sort on your right side?
Scott McPhee

1987 300D
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Old 04-30-2011, 01:05 AM
Registered User
Join Date: May 2009
Location: Sacramento, CA
Posts: 633
This happened on my 300SD because a magnetic cylinder
apx 1x3" had fallen out of the transmission and was hanging by its wire
under the car. shoved it back in and it solved the jumpy speedometer.
Not sure on your model if this applies.

1984 300SD 300,000 miles--two tank WVO setup
2.88 diff & 500SEL anti-squat rear end
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Old 04-30-2011, 01:30 AM
1980sd's Avatar
Registered User
Join Date: Apr 2011
Location: Elavil, Ga.
Posts: 910
Wasn't that a Stevie Nicks and Tom Petty tune?
My occupational hazard bein'
my occupation's just not around...
1980 300SD
1980 300SD
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Old 04-30-2011, 07:27 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,295
If you have a cable in that model, they often get jerky before failing. If you get some lube into it it may hold on for a while longer.

[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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