help 1994 e-350 7.3 non turbo - Diesel Forum - TheDieselStop.com
7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

 
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post #1 of 4 (permalink) Old 05-01-2019, 07:13 PM Thread Starter
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help 1994 e-350 7.3 non turbo

when i first start it up i can hear like a burp burp burp noise coming from the intake hose that attaches to the airfilter i know thier is some kind of flap valve where a carb would be and it sounds like it from thier on happens sometimes and i have to shut it off then restart it then it is fine is this something that is spring loaded or what controls it ? van runs great this started like a week a go any help and pics any advise how to fix it ??? thank you
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post #2 of 4 (permalink) Old 05-02-2019, 05:52 PM
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The intake is wide open through the air filter. Engine speed is controlled by the foot feed attached to the injector pump, which will supply more or less fuel. The noise you hear sounds like (from your description) it might be an intake valve hanging slightly open, or maybe leaking. If it hangs too far it will hit the piston, but just off seat probably not.

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post #3 of 4 (permalink) Old 05-02-2019, 08:34 PM Thread Starter
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Originally Posted by oldrebuiltdodge View Post
The intake is wide open through the air filter. Engine speed is controlled by the foot feed attached to the injector pump, which will supply more or less fuel. The noise you hear sounds like (from your description) it might be an intake valve hanging slightly open, or maybe leaking. If it hangs too far it will hit the piston, but just off seat probably not.
THAT DOES MAKE SENSE SO I COULD HAVE A WEAK VALVE SPRING THEN ........SO THAT FLAPPER VALVE THAT CONTROLS THE AIR GOING IN THE INTAKE HAS NOTHING TO DO WITH IT THEN ?
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post #4 of 4 (permalink) Old 05-03-2019, 08:34 AM
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There is no flapper valve, at least not supposed to be. Since there's no throttle plates like a gas engine to muffle intake/combustion noise, what you're hearing is probably normal.

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