Originally Posted by lindleypoolman
I have a Focus 1.4 CL, 2001, approximatley 110,000 miles on the clock. When the car is started from cold there is no problem for 4 to 5 minutes. It then begins to hesitate on acceleration and feels like it has lost some of it's power. I have had the coil pack, ht leads, plugs, battery, air filter and fuel filter renewed. None have solved the problem. I have had it hooked up to a code reader which reported no abnormalities. The engine management light is not on. Any help would be greatly appreciated. It's costing me a fortune. Thanks Chris.
sounds like your o2 sensor is out. b/c the engine ignores the o2's input until the engine is warm, just like you were saying.
another thing is sometimes the o2 sensor wont let you know anything is wrong with it, if you know what i mean. in other words no CEL
hope i helped some