350 Falling on its face - Impala Tech
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post #1 of 7 (permalink) Old 07-16-2020, 10:09 AM Thread Starter
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350 Falling on its face

Falling on its face. Hey guys I have a 1962 impala 350 400 hp with the 700 r4trans. The motor was built by a reputable shop called the engine factory in Lebanon New Jersey. What a beautiful job they did never had issues with the car for a few years up until last week. In the middle of a burn out the car just fell on its face for a second then came alive again. It was a sorry burn out for sure. My question is I believe it’s something simple just not sure what it could be. Is there an Accelerator pump adjustment on the Edelbrock 650 carb? Could that be it?
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post #2 of 7 (permalink) Old 07-16-2020, 11:54 AM
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Yes there is an adjustment, you move the rod to the other hole (two possibilities).

But before you change something find out what the problem is.

It could be ignition related, or fuel related. Without testing you won't know what is wrong.

I can not diagnose a problem over the internet. You need a mechanic who knows what a carburetor is (most of those retired years ago since carburetors began morphing into EFI in the late seventies with idle control circuits and transmission controlled spark). Your mechanic also needs to be familiar with a points ignition system (the last Chevy with points was built in 1984), and has the tools to look at timing, dwell, and coil saturation; as well as spark plug wire degradation.

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post #3 of 7 (permalink) Old 07-16-2020, 02:49 PM
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If it was in the middle of the burnout, it has nothing to do with the accelerator pump. Wide open throttle? Could have emptied the fuel bowl, then it started to fill up again. How's the fuel filter?
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post #4 of 7 (permalink) Old 07-16-2020, 09:48 PM
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Has the issue ever reoccurred or does it still do it? My first thought was dirt in the fuel supply too. Could have be at a filter, or even in the carb or needle/seat itself.

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post #5 of 7 (permalink) Old 07-23-2020, 02:39 PM
 
 
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Big Dave hit it on the nose test .resently went through the same kind but only on the start never in the power zone .mine was dirty bowls and I moved the pump rod .
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post #6 of 7 (permalink) Old 07-29-2020, 05:47 PM Thread Starter
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I’m going to check the filter this weekend. Been so busy at work.
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post #7 of 7 (permalink) Old 08-09-2020, 04:56 PM Thread Starter
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Quote:
Originally Posted by jayoldschool View Post
If it was in the middle of the burnout, it has nothing to do with the accelerator pump. Wide open throttle? Could have emptied the fuel bowl, then it started to fill up again. How's the fuel filter?
. Hey man I cleaned out the filter and fuel line with air and carb cleaner and reassembled and went for s ride. Smoked the wheels a little and it lost power again in the middle of it for a second than it catches back up. I’m wondering if I need to clean the main jet? Everything is new
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