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Re: Gasping stumble out of idle #84269 Sun Oct 14 2007 06:38 PM
Joined: Aug 2007
Posts: 304
J
Jim Meier Offline
Shop Shark
The only other thing I can think of is maybe you have a vacuum leak at the throttle body shaft. When I rebuilt my carberator (also a model "B") I noticed a lot of slop where the shaft went thru the throttle body. I took it to a machine shop and had them put new bushings in to tighten it up.

Re: Gasping stumble out of idle #84270 Sun Oct 14 2007 06:52 PM
Joined: Mar 2005
Posts: 1,029
B
Baldy Offline
Member
Try advancing the timing about ten more degrees and see if the stumble goes away, worked for me. If the engine kicks back against the starter, you have it advanced too far. You are not going to hurt it by trying this unless you get a persistent ping.

Re: Gasping stumble out of idle #84271 Sun Oct 14 2007 07:52 PM
Joined: Oct 2006
Posts: 11,765
D
Denny Graham Offline
Extreme Gabster
Hey Jim, Im always interested in learning more about the Rochester B carbs and their evolution. Where did you find that information about the revisions in 1952 and do you think I can get a copy of it?

Denny Graham
Sandwich, IL

Re: Gasping stumble out of idle #84272 Sun Oct 14 2007 08:07 PM
Joined: Mar 2007
Posts: 16
K
Kermit54 Offline OP
Junior Member
-Atomarc tried both techniques (think I'm gunna have a hickey on my hand) they seemed to help. easier to get around the "zone of death". guess I'll pull the carb and get medieval on it with the cleaner and compressed air.

-Jim, how would I check the throttle body for leaks (starter fluid?)?

-Baldy, I killed my battery with all this on and off business. So I'll give the advance a try in an hour or so.
Thanks to all of you, I think we're making progress!


-Owen
Re: Gasping stumble out of idle #84273 Sun Oct 14 2007 08:29 PM
Joined: Mar 2007
Posts: 16
K
Kermit54 Offline OP
Junior Member
Well Baldy I tried the advancing trick still no go.
Have I mentioned that any load on the engine and its twice as bad (can't even go two feet).


-Owen
Re: Gasping stumble out of idle #84274 Sun Oct 14 2007 08:32 PM
Joined: May 2007
Posts: 292
3
379MV6GMC-K3000 Offline
Wrench Fetcher
hmmm. . . this thing got a manual choke ? she stumble hot or cold or both. . . Before i put a Carb kit ( as sugested MR carbking) in my GMC it would do about tha same thing i found i had to run full for about the first half min it run then shut the choke all 1/4 of the way it would run fine shut all thway ideled fine but would die when i tryed to go. . . :confused:


1953 Studebaker M275, Reo-331 I6.
1962 GMC K3000, GMC-379 V6.
1969 AMC AMX, AMC-390 V8.
1976 Arctic Cat Jag, AC-275 I2.
1977 Ford F-350, Ford-351 V8.
1988 AMC/Jeep MJ, AMC-290 V8.
1992 GTA Trans AM, GM-406 V8.
1995 GMC K2500, GMD-6.5-T V8.
2007 Honda Rubicon, TRX-500 I1.
63'-88' J-truck + 89'-93' RAM350 + D80's = Jeep J-5500.


Re: Gasping stumble out of idle #84275 Sun Oct 14 2007 08:51 PM
Joined: Apr 2006
Posts: 500
O
Oilrag Offline
Shop Shark


-Tom

1950 Chevy 3100 w/ 1956 235
Re: Gasping stumble out of idle #84276 Sun Oct 14 2007 11:09 PM
Joined: Mar 2007
Posts: 16
K
Kermit54 Offline OP
Junior Member
Okay everyone, problem resolved!!! after frankinsteining my current carb with an ancient one I had arround I made it to the gas station and back without incident. It appears that the issue was the main metering valve. I say this because when I first put the hybrid carb back on the truck I still had the problem, but after swaping the mmv, evereything ran great!! Thank you all for all your ideas and suggestions, I don't know what I'd do without stovebolt.com.
P.S. I'm still saving up for a carter yf thow


-Owen
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