Rookie
Posts: 10
Joined: Sat May 05, 2018 6:28 pm
Part-throttle lean condition, 53 R110, SD220, Carter YF
Has anyone struggled with a part-throttle lean condition? It has had it for as long as I have had the truck (20+ years). Extra initial timing helps (12 degrees). All advance in by 2400 rpm. I opened the jet from .104" to .107" (checked with gauge pins) and moved the metering rod up about 1/16" (I should have taken an actual measurement, next time the carb. is open). The metering rod is .040"/.060".
The accelerator pump gives a good shot through the range of throttle opening.
Off-idle response is noticeably better with the extra fuel. Light throttle and WOT are fine. However, there is a spot in between that is unhappy. Especially noticeable with the rpm drop when accelerating after the 1-2 shift.
The next thing that I plan to do is install a vacuum gauge to get an idea of how far the throttle is open when it feels lean.
Curious if anyone else has had a similar experience.
Thanks,
Bill