Lets see, where do I start?
O.K. lets start with the mixture screw turned almost all the way out. That
tells me that you may have gotten something in the carburetor and the float
level is low or the jet is kind of restricted and letting only a little fuel
pass. Usually with a correct fuel level the mixture screw is about two
turns out from fully seated. I guess you'll be able to tell for sure when
you pull the plugs to check their condition. Your miss could be cured by
something as simple as resetting the point gap.
Positive ground is usually associated with the GMC's. For negative ground
Chevy's the coil's (+) terminal goes to the key switch and the neg. (-)
terminal goes to the distributor.
When my truck used to cough through the carburetor is was usually just off
timing a few degree's.
Hope you get the truck purring real soon.
Joe
-----Original Message-----
From: Holly and Chris Mills <scmills@tntech.edu>
To: old-chevy-truck@egroups.com <old-chevy-truck@egroups.com>;
oletrucks@autox.team.net <oletrucks@autox.team.net>
Date: Tuesday, January 02, 2001 5:52 PM
Subject: [oletrucks] '49 3100 - 2 questions (carb/electrical)
>Hi folks!
>
>I hope you folks can help me - I have a stock '49 3100 with a 216 engine.
>It has been running very rough and getting worse lately. I was driving it 5
>miles one way to work and then to our surprise middle Tennessee tuned into
>Indiana with snow coming daily and not melting. There wasn't much depth to
>the snow but the fact that it hung around is pretty impressive to us.
>
>I got old Jake running today but the idle is awful and under mild
>acceleration or mild cruising there is a miss that wasn't around much a few
>weeks ago.
>
>Today I set the timing and the dwell/points (about .016" right? what would
>that translate to in dwell?) and fiddled with the carb.
>
>I cleaned out the fuel filter and tried several settings on the mixture
>screw. It seemed to run best almost backed all the way out.
>
>The carb is a Carter and I have a spare that came from a '50 216 that is a
>Zenith. Are these carbs interchangeable or is one wrong and one right?
>
>The other thing that caught my attention is a recollection of several folks
>mentioning postive grounds on the batteries. So is my negative post
>supposed to go to the frame or the starter? Right now it goes to the frame.
>A long time ago someone told me that they chased an elusive poor idle
>problem to a reversed coil (wrong side + going to the points). I know alot
>of British cars are positive earth. Also my '72 Beetle would run with the
>cables in either position though I'm thinking it wouldn't charge if the
>leads were reversed.
>
>I replaced the spark plugs several weeks ago (AC Delco) and replaced the
>ignition wires many weeks ago (a very cheap set).
>
>I did not set the plugs as I didn't have my gapper then but it did seem to
>run pretty good then - but it has always idled a little rough.
>
>Every once in a while it will sneeze through the carb.
>
>I have not pulled the carb down or drained the bowl (no easy way without
>turning the carb over or the truck...).
>
>I have a second late model filter in line between the pump and the carb.
>I'll replace that soon.
>
>Have not done a compression test.
>
>It's hard to start lately but wasn't before. It alternately seems flooded
>and starved for gas - there isn't a pattern that I've noticed.
>
>I want to get this fixd as now my starter sounds sick (excess effort on
>it's part I guess) and I don't want to wear that out too.
>
>Hope you all got great toys for Christmas. My family enjoyed our time
>together and we ate very good...
>
>
>CHRIS in Tennessee
>scmills@tntech.edu
>ICQ: 5944649
>
>'78 Westy (maybe some CIS injection,Corvair, turbos --- hmmmm...)
>'65 Beetle (Type IV powered)
>'99 CR-V 5 speed
>'49 Chevy 3100 Pickup
>'81 Honda CB900C
>oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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