Cylinders 2,4,8 running rich

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#1 (permalink)

05-25-2011, 09:04 PM

llwalkman

CC Member

Join Date: Mar 2011

Location: Longmont, CO

Cobra Make, Engine: 1965 Mustang Fastback

Posts: 3

Not Ranked

Cylinders 2,4,8 running rich

I am running out of ideas here. Need some help please:
65 idles
150 mains
200 air
Idle screw 1 turn out.
Idle jet holder 1.00

Cylinders 1, 3, 5, 6, 7 spark plugs are light grey
Cylinders 2, 4, 8 spark plugs are sooted black.
AFR reads at cruise ranges from 13.1- 18.5
AFR on acceleration ranges from 10.9 to 13.1
AFR at idle is 25.0 to 38.0

I know I am running lean but cannot figure out why the trailing barrel of the weber carb is running rich. Any ideas? Thanks

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