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Author Topic: Accelleration problems  (Read 644 times)
harleyman_1000
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« 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?   
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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
luvrbus
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« 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
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Life is short drink the good wine first
Utahclaimjumper
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« 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 » Logged

Utahclaimjumper 
 EX 4106 (presently SOB)
Cedar City, Ut.
 72 VW Baja towed
harleyman_1000
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« 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?
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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
Utahclaimjumper
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« 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 » Logged

Utahclaimjumper 
 EX 4106 (presently SOB)
Cedar City, Ut.
 72 VW Baja towed
chessie4905
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« 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
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GMC h8h 649#028
Pennsylvania-central
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