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Old 08-05-2012, 06:20 PM   #1
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Angry Accelerator Problem

1998 Alpine 36' diesel pusher motorhome. Accelerator peddle quits intermittantly. You may drive 5 miles or 100 miles before it quits working. The accelerator quits working, the motor goes to idle. You have to turn the motor off and restart engine and it is O.K. until this happens again. Any information as to the problem will be greatly appreciated. The Cummins Dealer says he cannot find the problem unless it acts up in his presence.
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Old 08-05-2012, 08:43 PM   #2
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Had the same problem with my '99. They replaced the accelerator pedal. Turns out that the problem was with a loose wire. Can't remember (it was around 4 years ago) whether it was a power wire or a ground wire that was loose, but it was back at the engine, not in the front.

Hope this helps.

Charles
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Old 08-05-2012, 09:31 PM   #3
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If you have the C8.3 engine (not ISC) then you should check the diagnostic chart on the following link 2600 Series Diagnostics
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Old 08-06-2012, 08:24 AM   #4
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Try re-seating all the connectors associated with the pedal a couple of times.
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Old 08-07-2012, 08:19 PM   #5
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The 97-03 chassis' schematics show a "Williams Throttle w/Idle Switch." it has a 6 position connector, positions A-F as follows:
A- 305
B- 306
C- 307
D- THR OFF
E- THR ON
F- THR GND

So next time the situation presents, check for ground on pin F. Check the other pins for voltage in the full up, mid stroke, full down positions & record the data. Should be a pattern. Then cycle the battery as before till throttle is working. Check all 6 pins again & compare. Post the results for more analysis.
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Old 08-08-2012, 01:05 AM   #6
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If you have the Williams Throttle pedal and and it turns out to be the problem like Mike said, and it is not back at the engine, you may need a sensor kit for repair. You wouldn't need to replace whole pedal. Brake Systems INC. in Portland, OR 503 236 2116 would be the best source and they do have a good stock Williams Controls, since I think they own Williams Controls in Tigard OR. I have a different Williams pedal and sensor, so I can't help you with a part number and a sensor kit for mine cost $138.
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