69 Rochester 4MV float level question
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Joined: Oct 2000
Posts: 96
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From: Louisiana
69 Rochester 4MV float level question
Can the float level be adjusted on this model without taking the carb off? Any links on this subject? Float adjustment is 3/16" right? Any advice or pointers greately appreciated. Almost scared to do this because car runs great. Just very rich. Thanks in advance
Racer
Joined: May 2000
Posts: 386
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From: Niedernhausen, Germany
Re: 69 Rochester 4MV float level question (telk)
There is no need to pull the carb... have a look at http://www.corvettefaq.com - they have Lars' instructions along with great hints for trouble-shooting and tuning.
However I doubt the float level to be the reason for running rich.
If it runs rich in idle, it might be a bad adjustment of the idle mixture screws, bad power valve or bad choke mechanism.
If it runs rich in cruise or WOT, then the jet/metering-rod-combination is not right.
Have a look at Lars papers, they tell you about everything.
Thomas
However I doubt the float level to be the reason for running rich.
If it runs rich in idle, it might be a bad adjustment of the idle mixture screws, bad power valve or bad choke mechanism.
If it runs rich in cruise or WOT, then the jet/metering-rod-combination is not right.
Have a look at Lars papers, they tell you about everything.
Thomas
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: 69 Rochester 4MV float level question (V8yunkie)
GM had some problems with early nitril(foam) floats absorbing fuel. The ONLY customer complaint was bad gas milage, nobody had a running problem A heavy float will definatly cause a rich condition. There are many other thing that will cause a rich condition though. Choke sticking or mal-adjusted,With Q-jets, avacuum leak or low vacuum due to a cam change will do that too.
[Modified by silvervetteman, 6:34 AM 2/15/2003]
[Modified by silvervetteman, 6:34 AM 2/15/2003]
