Speedo erratic, shows speed when you let off - Ford Powerstroke Diesel Forum
 
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post #1 of 2 Old 03-16-2011, 03:15 PM Thread Starter
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Speedo erratic, shows speed when you let off

My speedometer has been not working for a while now, its been on and off and really bad when wet out. I replaced the vss in the rear diff and checked all wiring, a part above the axle was worn through, fixed it and still doesnt work. Its very erratic. say i accelerate to 80kms/h (50mph) the speedo will be fluctuating from 15-30 kms/h. but as soon as i let off the pedal and coast. the speedo jumps up to 80kms/h and slowly drops with my speed. (little bit of variation but not much). It jumps up to my real speed every time i let off the gas pedal. If i get back on the gas the speedo drops and fluctuates. Im not sure if could be a bad ground somewhere that gets more effected with moisture but im pretty stumped.

Its a 03 F 250 7.3

Thanks.

Mine:
03 F 250 CC Lariat 7.3
4" DP 5" Straight Pipe
Diesel site boost fooler
6637 intake
Adrenaline HPOP
PHP: stock-65 tow-80 daily-120 race-high idle-lope
35x12.50r20 Nitto Trail Grapplers (No lift/level )
20x9 XD Addicts

Dads:
05 F 350 SRW CC 6.0
Studs/EGR delete
4" DP 5" Straight
PowerMax Turbo
Swamps FICM
SCT with Xtreme Street from Innovative
420 whp 745 ft lbs




Last edited by JHarms84; 03-18-2011 at 04:05 PM. Reason: typo
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post #2 of 2 Old 03-18-2011, 04:06 PM Thread Starter
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any ideas??????? It throws a p0503 code too.

Mine:
03 F 250 CC Lariat 7.3
4" DP 5" Straight Pipe
Diesel site boost fooler
6637 intake
Adrenaline HPOP
PHP: stock-65 tow-80 daily-120 race-high idle-lope
35x12.50r20 Nitto Trail Grapplers (No lift/level )
20x9 XD Addicts

Dads:
05 F 350 SRW CC 6.0
Studs/EGR delete
4" DP 5" Straight
PowerMax Turbo
Swamps FICM
SCT with Xtreme Street from Innovative
420 whp 745 ft lbs



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