| [GMCnet] Jim Bounds interesting recent posts [message #325926] |
Fri, 10 November 2017 15:31  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Hi Rick,
No can should be left open here no matter what the contents! (grin). Our 40 plus year old motorhomes and their owners need all the help they can get no matter where it comes from.
I never heard back from the new owner of that coach as to what the root cause was so I have no idea if it was throttle body electronic related, fuel command center related, a loose wire somewhere, a failed fuse or relay, a module or coil failure in the HEI, or what. At the time he referred to the FiTech throttle body as an “electronic carburetor” and he reverted back to the carburetor stored in the pod to get home to AK. I don’t know if the FiTech throttle body ever went back on or not. He also had an issue with the Pertronics module in the generator (a loose ground wire according to the fellow who did the repair) but that was found after they reverted back to the points so I don’t know if the Pertronics module ever got back into service either.
The speculation about heat being the root cause issue with the coach not starting after a fuel stop was just that, speculation. There are a bazillion FiTech (and other) self learning EFI systems in service in all kinds of vehicles. Many of those now feature electronic controls inside the throttle body so I just don’t think that is an inherent issue.
I rarely hear about any FiTech failures in GMCs, but the few times I have heard of such it seems more related to something amiss in the fuel command center than it is with the throttle body. One person found a loose clamp on a hose inside the Fuel Command Center. Once that was tightened I have not heard of any other issues there. Another person found an apparently failed high pressure fuel pump inside the Fuel Command Center and once it was replaced I think that one worked just fine afterward as well. Side bar, I note that Jim Bounds does not use the Fuel Command Center, instead he has his people mount a high pressure fuel pump on the outside of the frame rail and he tosses another into the spares compartment on board.
On initial set up some people were confused by what it meant to set the mechanical stops on the throttle to produce what the instructions called "6 to 10 steps”. That referred to the number of steps the stepper motor controlling the air bypass needed to move in order to set the throttle position sensor to the correct position. The throttle position is a critical factor in calculating the proper injection duration so if that is not set right, the whole fuel curve would be effected.
Other than things like that I have not heard much about FiTech units not working correctly for our motorhomes in the field. I know there are a lot of them out there so they must be ok for most owners.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
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Message: 3
Date: Fri, 10 Nov 2017 18:03:51 +0000
From: Richard Denney
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Jim Bounds interesting recent posts
Message-ID:
Content-Type: text/plain; charset="UTF-8"
Jerry, I don't want to open a can of worms, but the longevity of the FITech
unit, with its electronics in a sometimes very hot throttle body, has been
questioned. One of the coaches you sold had a FITech system and suffered a
sudden fuel delivery failure for the new owners on their trip home. What
was the final diagnosis of that failure? There was speculation at the time
about effect of heat on the electronics……….
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Jerry & Sharon Work
78 Royale
Kerby, OR
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