Air/Fuel ratio question
Thread Starter
Pro
Joined: Apr 2002
Posts: 677
Likes: 0
From: WInnipeg Mb
Air/Fuel ratio question
How do you know if you are running too lean or too rich? I know GM made it difficult to access the mixture screws on 79-81 corvettes so how would you alter the a/f ratio? I have an old corvette book and it says to remove the hardened steel cap that is over the mixture screw. is this the only way? Or can you alter it by different jets and metering rods?
Safety Car
Joined: Jan 2000
Posts: 4,143
Likes: 0
Re: Air/Fuel ratio question (Justin79-L-82)
I'm thinking that you have a Q-jet ? ...or was it a throttle body system ???
....metering rod size would be a way to adjust it - IF you can get to them.
*Perfect ratio is always 14:1 air to gas ratio....
If it's running 'rich' then either adjust the flow rate or increase the air intake (and vice-versa).....but keep in mind that if you raise the fuel flow or raise the air flow - it'll mean better performance at the cost of fuel economy..... Sorry, you can't have both without a computer. :( :chevy
....metering rod size would be a way to adjust it - IF you can get to them.
*Perfect ratio is always 14:1 air to gas ratio....
If it's running 'rich' then either adjust the flow rate or increase the air intake (and vice-versa).....but keep in mind that if you raise the fuel flow or raise the air flow - it'll mean better performance at the cost of fuel economy..... Sorry, you can't have both without a computer. :( :chevy
Le Mans Master
Joined: Mar 2002
Posts: 7,456
Likes: 2
From: Coming home from Luckenbach Texas
Re: Air/Fuel ratio question (Justin79-L-82)
The mixture screws are for idle only. To change the high rpm mixture, you have to start messing with jets/metering rods.
If it ain't broke, don't fix it! :smash:
If it ain't broke, don't fix it! :smash:
