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| | | | Joined: Jul 2008 Posts: 111 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 111 | Ok guys, I am totally baffled on this one.
235cui 1957 3200, 3 on tree. Dual single barrell rochester carbs, fenton intake and fenton dual exaust. The truck was running great up till this past week. I can do 40,50,60,70MPH no problem. BUT on deceleration (coming off highway) I have bogging followed by major backfire and stall. Cant start immediately after stalling, but wait 10 min, and she fires right up. Its like she is getting flooded out big time. Whats happening??? THANKS | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | When it stalls look for gas running out the throttle shafts or look down the carb throat & see if gas is running in. You might have too much fuel pump pressure. Most vacuum gauges have A pressure tester on them. It should be 3-4 lbs. If exsesive you need a pressure regulator. Also check the point gap & see if it is opening enough.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Mar 2000 Posts: 784 'Bolter | | 'Bolter Joined: Mar 2000 Posts: 784 | You might also check your carb floats. I had a similar problem and it turned out that one of my floats was sticking open causing the carb to flood and stall the engine.
After fighting with my rochesters for a couple of years I finally bought a couple of carter-webbers. One of the best changes I've made to my truck. These are sweet carbs.
George | | | | | Joined: Jul 2008 Posts: 111 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 111 | could it be that I need a pressure regulator?? How much are these and who sells them??
Also, what about a valve adjustment. its got 2,500 miles on the rebuilt (1yr ago) motor.
thanks | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | In addition to what the others have said, you might check the ignition timing. You may need to advance it.
Bill Burmeister
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I got your private message. The point gap was a long shot but sometimes when the rubbing block wears down the points barely break & can cause all sorts of weird problems, but with elec. ignition that is not the case. A vacuum/ pressure gauge is a handy tool to have especially with dual carbs. They are not expensive. If you get a reading you can tell if excessive pressure is the problem. Like Forme says it could be a float problem. First determine if in fact it is flooding like I described in the first answer.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
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