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Old 10-14-2021, 10:28 AM   #1
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Foot feed, gas pedal?

2018 MADP Spartan chassis. Seems I have about an inch of free play in the pedal before I get any response. Kindas drives me crazy when manoeuvering tight spots and campgrounds. Not a big deal on the hiway but if itís an easy fix I would.
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Old 10-14-2021, 11:13 AM   #2
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You might just be waiting for response from the turbo at low speeds. At cruising speeds, do you have perceivable throttle response in that first inch of pedal travel? Every diesel rig Ive driven (many fire engines, ladder trucks, and a couple class A coaches including a Country Coach C9) have basically no throttle response from a stop until its almost on the floor.
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Old 10-14-2021, 11:48 AM   #3
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Nope, not that. I drove OTR truck most of my life, this is dead pedal for the first inch.
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Old 10-14-2021, 11:59 AM   #4
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All of the functions now are "fly by wire" so it sounds like the sender unit in your accelerator pedal is not working correctly.
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Old 10-14-2021, 12:02 PM   #5
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There is a simple procedure to recalibrate the throttle position sensor. I would have to look it up online to get the details.

However, I remember the cliff notes version is something you do with the ignition key and waiting so many secondsÖ..then you slowly depress the throttle all the way, and then slowly release it. And by slow, I mean like 15 seconds or something for each cycle. This makes the ECM ďlearnĒ the values itís receiving from the sensor.
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Old 10-14-2021, 07:44 PM   #6
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Figured it was a re-cal thing, did a google and can't seem to find any instructions on how or what the sequence is to reset it . Anyone know where to look?
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Old 10-14-2021, 07:53 PM   #7
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I found this online, the service bulletin may or may not apply to you, but there is a calibration procedure at the bottom of the document.

https://www.abc-companies.com/wp-con...ion-Sensor.pdf
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Old 10-14-2021, 07:56 PM   #8
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Assuming you have a Williams brand or similar fly by wire foot throttle, the accelerator tps is easily adjustable at the roller linkage arm on the backside of the foot pedal. Usually a good idea to lift that baby up every now and again to clean and lube things also. I've seen the pivot pins get stuck before on municipal use applications.
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Old 10-14-2021, 08:01 PM   #9
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X-rated,
Don’t know anything about the problem, but just wanted to say I haven’t heard the term “foot feed” in many years. A lot of folks especially the younger ones would not know what you were talking about had you not said gas pedal.
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Old 10-15-2021, 08:28 PM   #10
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I’m young!!
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Old 10-15-2021, 08:29 PM   #11
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Says I’m a junior member!
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Old 10-16-2021, 04:52 AM   #12
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Quote:
Originally Posted by JMcG View Post
X-rated,
Donít know anything about the problem, but just wanted to say I havenít heard the term ďfoot feedĒ in many years. A lot of folks especially the younger ones would not know what you were talking about had you not said gas pedal.
JMcG
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I thought it was a typo.
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Old 10-16-2021, 08:14 PM   #13
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Foot feed, gas pedal?

Only gassers have a gas pedal. All DPs are fed thru foot feeds because diesel pedal just sounds dumb 🤪
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Old 10-16-2021, 08:42 PM   #14
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So "judicious application of throttle does not apply here"?
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