62Ranchero200
Famous Member
Greetings Ford Six Fans,
The Ranchero was very rich at idle, especially when cold (I have a wideband A/F gauge), and came up to operating temp very slowly. I suspected that either the power valve was opening at too high a vacuum (I have 11" at idle), or that the PV was leaking. I replaced the #65 PV with a #55 and now it idles well and comes up to operating temp more quickly. I tested the #65, but it seems to work.
I also replaced my typical 13" air cleaner with chrome top with a K&N air cleaner with a filter element top, advertised as a high flow air cleaner:
Since the PV and air cleaner replacement, the Ranchero idles at a reasonable air to fuel ratio, is at a reasonable A/F at part throttle and WOT, but is very lean (15.0 - 16.0) at steady cruise. I don't feel comfortable this lean, and plan to change the #70 jets to #71 to attempt to adjust.
Could the K&N air cleaner really flow so much more air as to cause the lean cruise?
Thanks
Bob the Builder
The Ranchero was very rich at idle, especially when cold (I have a wideband A/F gauge), and came up to operating temp very slowly. I suspected that either the power valve was opening at too high a vacuum (I have 11" at idle), or that the PV was leaking. I replaced the #65 PV with a #55 and now it idles well and comes up to operating temp more quickly. I tested the #65, but it seems to work.
I also replaced my typical 13" air cleaner with chrome top with a K&N air cleaner with a filter element top, advertised as a high flow air cleaner:
Since the PV and air cleaner replacement, the Ranchero idles at a reasonable air to fuel ratio, is at a reasonable A/F at part throttle and WOT, but is very lean (15.0 - 16.0) at steady cruise. I don't feel comfortable this lean, and plan to change the #70 jets to #71 to attempt to adjust.
Could the K&N air cleaner really flow so much more air as to cause the lean cruise?
Thanks
Bob the Builder