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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Oct 2012 Posts: 85 Shop Shark | | Shop Shark Joined: Oct 2012 Posts: 85 | my 3100, 235 engine with Rochester carb is sputtering (hesitating) when shifting from 2nd to 3rd gear. Once in 3rd gear and above 40mph she has pep and run ok. I've notice if I pull the choke out slightly (even with engine warm) it will sputter less.
I've done the timming by attaining the maximum vacuum gauge method
Any suggestions? | | | | | Joined: Jan 2013 Posts: 2,232 Moderator: Interiors, Texas Bolters, Name that Part | | Moderator: Interiors, Texas Bolters, Name that Part Joined: Jan 2013 Posts: 2,232 | maybe fuel mixture.... probably running too lean? | | | | | Joined: Feb 2004 Posts: 29,751 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,751 | Check on the movement of the power valve plunger. It should move easily without any tendency to stick (although they usually stick in the rich position). If it's not opening the ball check valve as the manifold vacuum drops the mixture will be lean on acceleration.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Nov 2010 Posts: 1,159 Shop Shark | | Shop Shark Joined: Nov 2010 Posts: 1,159 | Sounds like Jerry is right on the money! i got the plunger freed-up,but the check ball was lodged,and the truck wouldn't even idle. At least the plunger is an easy fix. Might be a good time to rebuild the carb,though. Kits are about $20.00. | | |
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