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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: Jan 2011 Posts: 138 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 138 | Hey guys,
I was test driving my neighbors 57 3100 the other day (trying to talk myself into it), and when I applied a good bit of throttle, it had one big backfire. The motor is a bored out 283 with corvette cams. but there is a exhaust leak where the manifold bolt to the actual exhaust pipe (3 bolts). the owner said the donut seal might be crooked. could this cause a backfire? he said it also might be running a little lean, but it cant be much because the idle is still a great low lope.
Alex
57' 3100 (The Bondo Bandit)
Bad rust and worse wiring, but so much fun.
| | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | It's dought ful the exhaust leak caused the backfire. It could be a lean condition or slow timing.
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: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | Or in need of a valve job... | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | Or the shooter in the carb isn't working, which of course would cause a lean condition at full throttle and have nothing to do with the idle. | | | | | Joined: Mar 2005 Posts: 637 Shop Shark | | Shop Shark Joined: Mar 2005 Posts: 637 | The accelerator pump probably is not giving a good shot of fuel. | | | | | Joined: Jan 2011 Posts: 138 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 138 |
Alex
57' 3100 (The Bondo Bandit)
Bad rust and worse wiring, but so much fun.
| | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | With the engine off, remove the air cleaner off and pull the throttle open. The accelerator pump should shoot a stream of gas like a water pistol. If it doesn't, you need to overhaul the carburetor. | | | | | Joined: Mar 2010 Posts: 843 Shop Shark | | Shop Shark Joined: Mar 2010 Posts: 843 | Dalyman72, if the accelerator pump is shooting a weak stream or no stream a quick fix that costs nothing is oiling the accelerator pump leather plunger to restore its elasticity.
Ray
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