Patrick,
The other afternoon I was driving my '55 1st (Original carb.) and it
started to buck and would'nt go over 45 or 50 mph. When I would let up on the
gas it smoothed out, but when I tried to go faster it started bucking again. I
got it home and checked the points, plugs, and all the wires. I had rebuilt the
carb about 2 years ago so I know it is o.k. Then I took off the fuel filter,
and sprayed carb cleaner in it and gave it a shot of compressed air and a bunch
of crud came out of it. I made sure it was clean and put it back on. Now my
truck runs just fine. Try that on yours, or get a new fuel filter. It might
just do the trick! The filter on mine is the inline metal type, not the glass
bowl type.
Rick (Griz) Warren
'55 1st series 3100
http://www.expage.com/oldbluu
237459N@knotes.kodak.com wrote: From: W P. Fricke
From: Barbara Boedigheimer
Subject: [oletrucks] tune up
Barb asks: I am trying to fine tune my 49 GMC 228. It runs pretty good but
while
idling every once in awhile will backfire thru the carb...
I too experience some carb farts every once in a while. But not while idling.
Only when accelerating hard. Its usually when the engine hasn't fully warmed up
to full running temperature and I hit the pedal. Usually backfires through the
carb are an indication of a 'too-lean' mixture. If you backfire through the
exhaust, your mixture may be too rich. Mine is a Rochester carb. I haven't
pulled it to do a rebuild or check the size of the jet(s). I don't even know if
there are slow and main jets in the thing.
The other condition I have experienced is that it runs much smoother from a stop
and when accelerating out of a gear shift if the choke is out a little. I had
the throttle hooked up but the pedal kept getting stuck and I'd have to reach
down and pull it back, so I dis-connected it. So I wonder if the carb back fire
and the general smoothness of acceleration are connected symptoms of a overly
lean mixture.
To top things off, for the first time in a year I was driving home when the
engine started to stumble like it was running out of gas and quit. I sat for
probably no more than 30 seconds, started it back up successfully and drove home
without a problem (about 12 miles). This has happened twice. Plugged fuel
filter? Faulty pump?
Patrick
53' 5-window 3100
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