June 23, 2018, 05:12:02 PM

Author Topic: Accelleration problems  (Read 1635 times)

Offline harleyman_1000

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Accelleration problems
« on: June 18, 2013, 09:46:32 AM »
 I am talking with a guy that has a 4106 that he says will sputter at about 20 mph, then take off and run good. He says he was told it sounds like water in the fuel. Any other ideas on what it could be? Fuel filter? What could the worst case for this be? Im interested in this bus, but don't want to travel several states to look at something that I could rule out with your experience. It has a auto trans if that matters?   
Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1

Offline luvrbus

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Re: Accelleration problems
« Reply #1 on: June 18, 2013, 01:02:05 PM »
I doubt the water theory probably air or the fuel pump getting weak

good luck
Life is short drink the good wine first

Offline Utahclaimjumper

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Re: Accelleration problems
« Reply #2 on: June 18, 2013, 01:20:46 PM »
 If the fuel pump was "getting weak", it would not accelerate any better above 20 MPH. It would be interesting to check the fuel pressure at the final filter(easy to do) it should be 50-70 LBS>(65 average) at 2000 RPM, min. at idle 35. I'm wondering if it has the RPM modulator installed (easy to remove)as used in California to minimize smoke during acceleration off the line.>>>Dan
« Last Edit: June 18, 2013, 01:25:37 PM by Utahclaimjumper »
Utclmjmpr 
 EX 4106 (presently SOB)
Cedar City, Ut.
 72 VW Baja towed

Offline harleyman_1000

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Re: Accelleration problems
« Reply #3 on: June 18, 2013, 02:44:21 PM »
 Thanks very much for the information. I was also told that it could be a air flap? Would any of these harm it to drive it?
Scott 
St.Louis Missouri

1958 GM 4104 Extended 2 feet, with a 6v92 and 5 speed automatic

http://s783.photobucket.com/user/harleyman_1000/library/Gm4104%20bus?sort=3&page=1

Offline Utahclaimjumper

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Re: Accelleration problems
« Reply #4 on: June 18, 2013, 03:33:19 PM »
 Forget the "air flap", can't happen per your description.>>>Dan (I would look for dirty fuel filters)
« Last Edit: June 18, 2013, 03:40:45 PM by Utahclaimjumper »
Utclmjmpr 
 EX 4106 (presently SOB)
Cedar City, Ut.
 72 VW Baja towed

Offline chessie4905

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Re: Accelleration problems
« Reply #5 on: June 18, 2013, 04:34:16 PM »
Maybe his "sputter" is bad injector, burned valve/s, needs tune up... See if he could send you a video and sound clip of engine idling to speeding up at rear of coach
GMC h8h 649#028 (4905)
Pennsylvania-central