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Newell Gurus 2018 Rally May 1-8 at Bella Terra in Foley, Alabama Check out Rally Thread

Williams air throttle
#11
If the pressure at the actuator is changing smoothly but not the rod, it may be that the cylinder/piston interface is restricting movement.

If you have a restriction in the airline between the pedal and cylinder I believe you would see a linear relationship between the pressure at the cylinder and the rod position, but the pressure would rise and drop slowly.
Jon Kabbe
1993 coach 337 with Civic towed
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#12
I think Jon said it earlier, I'd try to connect a pressure gauge in the back to see if the pressure changes when you press the pedal. I planned to fix mine with a rebuild kit, I found the replacement before rebuilding it, plus my old unit did not look great to me. The seal/bellows had a couple holes in it. you can pull that unit off and pull the cover off where the air line connects.

Before I fixed my throttle I drove the Newell 200 miles from Indy to Jenison MI. When I pressed on the pedal it just wouldn't go. Even pressing the pedal down to the floor it took a while for the rpm's to increase. Driving home was an adventure - I got stuck on the side of the road a few times because of the lack of throttle function.
I thought it had to be something in the front pressure unit until after I replaced the rear unit. I couldn't find the front unit to buy so I guess I got lucky. I think the back unit was cheaper and easy to find on Ebay. Throttle works perfect now, which is awesome from where I was at first.
Your's sounds the same to me.
Mine is a 1975 and the old unit looked original to me so I just replaced it as part of my testing process and to prevent future issues.
Good luck - slow an steady always works for me.
Hang in there. Just my experience, hope it helps.

nice pictures - prices seem high tough - http://www.coachconversioncentral.com/airthrottle.htm
John and Marcia Marshall 
1975 Newell 30ft - Diesel 9.0 IHC Navstar
Not pretty but will be.
98 Mustang GT - 05 Mercedes C Class
Amoco Dealer 78-97
Tool Designer - Master ASE Auto Tech - Systems Engineer IT
Marcia - Paralegal - Melco Embroidery part time business
Hope to retire - soon  Cool



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