Ford Ka 1.3 2001 - Ok at idle but flat spot under load #Archived Message
Posted by john enticott on June 27, 2007, 9:27 pm
Hi all. I have a brain teaser for you. This car runs fine at idle. but when under-load i.e up hill in 5th flat out doing about 40mph. Throttle position 100%. The o2 swings lean to a 000.00v and the fuel trim to 25% the car pulls back like you are running out of fuel then drive under half load fault goes and the o2 returns normal and e/m light comes on. I have road tested and monitored the following sensors with no visual faults... O2 / map / TPS / fuel pressure / fuel pump electric supply and current draw / fuel pressure regulator vacuum / There is no egr system and I have blocked off the EVAP system. There are no air leaks.ONLY FAULT CODE = o2 sensor bank 1 sensor 1 low input.