MustangWorks.com : Ford Forums - View Single Post - Mixture seems to lean out while cruising but not acceleration/decel and idle

66StangGuy · 12-12-2002, 04:17 AM

check your pcv valve connections and hoses. i had the same problem in my 66. i added the o2 sensor and gauge..same one you have. anyway turned out the hose was leaking next to the carb and under steady vaccume it would leak and cause a lean condition. identical to what problems you had. take it completely apart and check for vaccume leaks and any bad clamps letting air in.

12-12-2002, 04:17 AM	#2
66StangGuy Registered Member Join Date: Feb 2002 Location: Diamond Bar Posts: 258	check your pcv valve connections and hoses. i had the same problem in my 66. i added the o2 sensor and gauge..same one you have. anyway turned out the hose was leaking next to the carb and under steady vaccume it would leak and cause a lean condition. identical to what problems you had. take it completely apart and check for vaccume leaks and any bad clamps letting air in. __________________ 66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.