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  Speedometer is jumpy

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Author Topic:   Speedometer is jumpy
grandestang
Gearhead

Posts: 375
From: Lake Bluff, Illinois USA
Registered: Jan 2003

posted 05-24-2003 02:04 AM     Click Here to See the Profile for grandestang   Click Here to Email grandestang     Edit/Delete Message   Reply w/Quote
When my car is cold the speedometer hops or jumps up and down in the general area of the speed at which I am going. As the car warms up the bouncing gets less and less and it begins to more accurately read my speed until I cannot notice a bounce anymore. Has anyone had this happen to them. Could it be a bad speedo gear? Low tranny fluid? (as the transmission has been leaking and not refilled)
Not a real problem, I am just curious as to what could be causing this.

Paul

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1970 Grande
H code 351W FMX

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mustang68mustangs
Gearhead

Posts: 454
From: pittsburgh,pa.usa
Registered: Jul 2001

posted 05-24-2003 09:37 AM     Click Here to See the Profile for mustang68mustangs   Click Here to Email mustang68mustangs     Edit/Delete Message   Reply w/Quote
Try to unhook the cable from the back of the speedo and spray some lubricant into the cable until you see it come out the other end.Motorcycle cable lube works real well.
Bob

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N266fords
Gearhead

Posts: 1453
From: Spokane ,WA USA
Registered: Apr 2003

posted 05-24-2003 12:06 PM     Click Here to See the Profile for N266fords   Click Here to Email N266fords     Edit/Delete Message   Reply w/Quote
it sounds like the cable if fraying inside ready to break..You can lube it like stated above but its only going to be a bandaid fix..Bruce

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indyphil
Gearhead

Posts: 2454
From: Senoia, G.A. USA
Registered: Jul 2002

posted 05-24-2003 01:22 PM     Click Here to See the Profile for indyphil   Click Here to Email indyphil     Edit/Delete Message   Reply w/Quote
Mine was jumpy once after I had removed the dash and reinstalled it. I had forced the cable into a kink. check behind the dash and make sure the cable has an easy route and is screwed into the back of the speedometer tightly - that is if you have moved the dash recently.

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'68 coupe 289 C code
66 heads, edel 600cfm carb, performer intake, dual exhaust

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