Carburetor Air Cut Off Valve (Diaphram)

PIPOR1

MEMBER
1987 HONDA ACCORD
193,000 MILES

Could you please explain the purpose of the air cut off valve(diaphragm) on the carburetor. My 1987 Accord is intermittently experiencing rough idling especially after a hard acceleration. I applied vacuum to the diaphragm of the Air Cut Off Valve and it doesn't hold a vacuum as it should. Could this defective valve among other possible problems cause rough idling?
Thank you,
Paul.

3 Replies

PIPOR1

MEMBER
3 POSTS

I meant Air Vent Cut Off Valve on the carburetor.

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Monday, May 6th, 2013 AT 2:50 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Its an air diverter valve for emission controls. Why do you think this valve is causing the issue?

Did you have the egr valve checked for sticking?

Roy

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Monday, May 6th, 2013 AT 4:19 PM

PIPOR1

MEMBER
3 POSTS

My question was the purpose of this valve and if it could cause an idling problem if it wasn't operating. Can it? The EGR valve appears to be working normally when I inspected it but I can't say it isn't sticking partially open that I don't know for sure. My question now is why the EGR valve would stick open after quick acceleration when driving, but not when I rev the engine in park or neutral time after time?

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Monday, May 6th, 2013 AT 6:15 PM