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Old 10-15-2017, 04:35 PM   #1 (permalink)
Join Date: Sep 2016
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Default Why An I Over Choking?

My car idles well when warm, but when it is cold it seems like it is over choking.

When it starts it will rev up to around 1600, where I would like it to stay while warming up, but then it drops to below 800 and sputters while smoke kicks out the exhaust. When I pull the vacuum tube that goes to the air horn off, the idle goes up to where I want it. Since that leans out the mixture by letting air into the intake, I am certain my car is running much to rich when cold.

I checked the choke linkage and everything is working how it should. The vacuum diaphragm is also working properly, and the choke plate looks like it is in a reasonable position when the car is idling. Once it warms up it runs perfect and I get about 23mpg. I need to Smog this car in the next couple days, it's my only vehicle, so I would really appreciate some help.

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