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#66717 10/02/2006 4:38 PM | Joined: Dec 2003 Posts: 58 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2003 Posts: 58 | Good morning, Well guys I have to say thanks for the help. I took my 55.1st series to a local cruise with my 12 year old son this Saturday and it was great. Every week I fix somethig new(with your help) and it keeps getting better. This week my project will be to work out the flat spot I feel when I roll on the throttle. Off idle and a couple hundred rpms (no tach) and it goes flat and I need to let up on the throttle and then ease back in to pass the flat spot. If I come back down to that rpm range it will flubber again. I rebuilt the carb but did not touch the timing just plugs, points, condensor. Changed the fuel tank with new one and fuel lines.What do you think?
Thanks
Tony | | |
#66718 10/02/2006 5:10 PM | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | I'm certainly not a carb guy but it sounds like float level to me. What carb is it? | | |
#66719 10/02/2006 9:08 PM | Joined: Aug 2005 Posts: 6,383 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,383 | I'm not a carb specialist either but a hesitation on acceleration is a classic example of an accelerator pump problem. The pump isn't providing the fuel the engine needs resulting in a lean condition. Of course that applies only if the problem is always when accelerating. The next time you take your truck out, hold it at the throttle level where it starts to hesitate. If it continues to stumble while not accelerating it's likely not the accelerator pump. If it runs OK after an initial hesitation the accelerator pump is a good candidate.
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#66720 10/02/2006 10:34 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Very good points. Try advancing the timing a little & see what happens. Make shure the vacuum advance is working.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#66721 10/03/2006 2:33 AM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | I'm with Wrenchbender Ret. Most people mess with their carbs when the real problem is electrical (timing, plugs, wires, etc.) The engine will only bog momentarily with a bad accelerator pump, but for much longer if it is a retarded timing situation. | | |
#66722 10/03/2006 2:28 PM | Joined: Aug 2005 Posts: 6,383 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,383 | Originally posted by Baldy:
The engine will only bog momentarily with a bad accelerator pump, Tony's original post seems to indicate a momentary hesitation. In most cases you are correct however I've seen (owned one myself) an engine die because of an incorrectly working accelerator pump. It's kind of a bummer when you step on the gas to pass & the engine takes a crap on you in traffic. 
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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#66723 10/03/2006 3:43 PM | Joined: Jun 2006 Posts: 687 Shop Shark | | Shop Shark Joined: Jun 2006 Posts: 687 | Remove the air cleaner, look down the carb with the choke open and a light. With the engine off, slowly move the accelorator linkage, there should be a squirt of fuel, (not a dribble) a squirt of fuel splashing on the throttle plate as the linkage moves. If it don't squirt (like a toy squirt gun) you need to check the accelorator pump and the float level.
Timing will cause a hesetation (well it is realy more like a low power problem) but the most common problem is the accelorator pump.
I didn't do it, no one saw me do it, you can't prove anything! "Bart Simpson"
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