speedometer
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Laughing Gas
Joined: Jul 2004
Posts: 783
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speedometer
Ok, just brought my 99 home (build date 6/99) I did some searches but i couldnt find what i was looking for. The speedo isn't working, but the trip/odometer is working fine no lights are blinking. any ideas of how to find out if it is the gauge? I think it would be the gauge since the trip/od. is working?
Post Fiend
Joined: Jun 2006
Posts: 5,497
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From: Central, Al
There isn't any test in that manual for the speedo itself but the test for "No Speedo, Working Odometer" say to monitor VSS PID (Vehicle Speed) with a scanner and set cruise controll at 30mph (by the scan tool). If the Speedo does not match the Scan tool replace the entire cluster.
Postmaster
Joined: Jun 2006
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From: Fulltime RVer
Originally Posted by amiller93
"No Speedo, Working Odometer" say to monitor VSS PID (Vehicle Speed) with a scanner and set cruise controll at 30mph (by the scan tool). If the Speedo does not match the Scan tool replace the entire cluster.
When my VSS went due to chips from the diff carrier bearings going bad, it effected both the speedo and the shifting, and flashed the OD light. My guess is that mustangs problem is just a bad speedo meter.
Originally Posted by mustang_gt_350
The speedo isn't working, but the trip/odometer is working fine no lights are blinking.
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
I'd like a copy of it, Ernest. I notice my speedo is off by a couple miles per hour per my GPS. When I'm doing 70 on the GPS, speedo says 72.5. When I'm doing 80 on the GPS, speedo says ~83. Annoys the cr@p out of me...
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Laughing Gas
Joined: Jul 2004
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i had actuall thought about just using a handheld gps unit til i get it fixed. I just got the truck so i have no idea of what RPM is what speed. if it was my jeep it wouldnt be a problem. I might also get an aftermarket speedo and mount on the pillar depeding on how much i can find a cluster for.. thanks for the reply's i posted it right before i was leaving for work (work nights) and didnt get a chance to get back on until now.
Cargo Master
Joined: Jun 2003
Posts: 3,292
Likes: 6
From: Ardenvoir, Washington
My speedo quit on my 99 and got a flashing OD switch light and replace the VSS sensor on top of rearend.. Got it from napa P/N 530780 (napa calls it a ABS sensor) on www.napaonline.com $10.49.. Fixed the problem, been good for two years now.
Postmaster
Joined: Jun 2006
Posts: 2,647
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From: Fulltime RVer
MPH vs RPM
MPH vs RPM
MPH = [(0.002975)(RPM)(Tire Dia)] / [(Diff Ratio)(Tranny Ratio)]
For my truck... Tire Dia = 31.6" for stock tire 265 75R 16, Diff Ratio = 4.10
Tranny Ratio's are... 1st = 2.71, 2nd = 1.54, 3rd = 1.00, 4th = 0.71
For example, at 2000 RPM this gives... MPH = 45.86 / (Tranny Ratio)
So at 2000 RPM, MPH is... 1st = 16.92, 2nd = 29.78, 3rd = 45.86, 4th = 64.59
For a 3.73 Diff Ratio the above MPH are higher by 4.10 / 3.73 = 1.0992
So at 2000 RPM, MPH is... 1st = 18.60, 2nd = 32.73, 3rd = 50.41, 4th = 71.00
If you want my sheet email at kempegenek@gmail.com
Note... My Tire Dia is for 80 psi
MPH = [(0.002975)(RPM)(Tire Dia)] / [(Diff Ratio)(Tranny Ratio)]
For my truck... Tire Dia = 31.6" for stock tire 265 75R 16, Diff Ratio = 4.10
Tranny Ratio's are... 1st = 2.71, 2nd = 1.54, 3rd = 1.00, 4th = 0.71
For example, at 2000 RPM this gives... MPH = 45.86 / (Tranny Ratio)
So at 2000 RPM, MPH is... 1st = 16.92, 2nd = 29.78, 3rd = 45.86, 4th = 64.59
For a 3.73 Diff Ratio the above MPH are higher by 4.10 / 3.73 = 1.0992
So at 2000 RPM, MPH is... 1st = 18.60, 2nd = 32.73, 3rd = 50.41, 4th = 71.00
If you want my sheet email at kempegenek@gmail.com
Note... My Tire Dia is for 80 psi
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