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Old 12-21-2013, 11:51 PM
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Why does my car die when I floor it?

So I have a 1976 Chevy Monza 2+2 with a 350 csb from a 1975 chevy c20 (originally a 4.3l v8). The car has a shift kit, Hooker headers, Weiand intake manifold, Holley carburetor, and I think a stall converter. I recently got the car from a family friend and got it running after it had been sitting for 20+ years. All I needed was to unstick the float, replace the fuel pump, new fluids, battery, and she was up and running. Now for my question. Whenever I floor it at a full stop, the engine bogs down and dies. Does anyone know why this would be happening?

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Old 12-22-2013, 12:26 AM
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Check the accelerator pump by looking down the carb throat with a flashlight and actuating the linkage. You should see a steady stream of fuel for a couple seconds from the accelerator pump nozzles. Engine off, of course. The pumps usually dry out if they sit that long.
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Old 12-22-2013, 12:27 AM
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did you clean anything else in the carb?

does it drive if you don't floor it from a stop?

if so, ^^^^ sounds like a good place to start.

depending on what it's worth to you, I'd rebuild the carb completely (or as complete as you can). I recently rebuilt an old QJet for a turbo buick and it was pretty scummy on the inside. car sat for a really long time with gas in it. I soaked it in a bucket of cleaning solution for a few days. rebuilt it with all new innards and it ran really well. i'd also check for vacuum leaks if you have a plethora of those lines around.

Last edited by ben s.; 12-22-2013 at 12:33 AM.
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Old 12-22-2013, 01:51 AM
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There is a little hesitation when I floor it while I am driving but it does not die. It also starts to sputter and die when I take a really sharp turn in floor it. I was told it is either lack of fuel or too much fuel. Any thoughts?
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Old 12-22-2013, 02:10 AM
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Quote:
Originally Posted by PeterPaul383 View Post
There is a little hesitation when I floor it while I am driving but it does not die. It also starts to sputter and die when I take a really sharp turn in floor it. I was told it is either lack of fuel or too much fuel. Any thoughts?
I would definitely rebuild the carb or have it rebuilt. Don't even try to figure out what is causing it because when a carb sits for 20 years, it certainly needs to be rebuilt. I restore cars as part of my job. We sometimes buy cars that have been sitting for 30 years, sometimes longer (we had one that hadn't been driven since 1959!) and almost universally, their carbs need to be rebuilt. Many older carbs had a leather accelerator pump and they will turn to dust. Also, gasoline left in the circuits of the carb turns to varnish and causes restriction. This is why it is so important to properly clean the carb. Spraying it down with carb cleaner will not work. Many times, the stagnant liquid cleaners such as B12 don't work effectively. In that case, an agitated solution, such as an ultrasonic cleaner, will do the trick.
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Old 12-22-2013, 04:30 AM
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make sure the entire fuel system is cleaned out and old gas removed. If the exhaust has a rotten smell then old gas is in the system.Old gas loses energy and the engine ,if it runs,will run poorly
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Old 12-22-2013, 10:43 AM
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After rebuilding the carb I'd install an inline fuel pressure gauge and holley pressure regulator. Sputtering around turns could be float adjustment at that point, but fuel pressure needs to be correct.
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Old 12-22-2013, 02:06 PM
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Post the manufacturer and part number of the fuel pump you installed.
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Old 12-22-2013, 08:40 PM
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My take is it's running out of gas. If you didn't clean the tank it's a safe bet the sock in the tank is shot.
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Old 12-29-2013, 07:52 PM
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the big question is.. does it die in a cloud of black smoke?
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Old 01-01-2014, 10:41 PM
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I will definitely be rebuilding the carburetor. Thanks everyone for the help!
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Old 01-02-2014, 06:25 AM
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Post some pictures of the car too... Those Chevy Monza 2+2 were neat little cars.
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