Power loss

Asked by Aug 02, 2018 at 03:32 AM about the 2008 Ford Fiesta

Question type: Maintenance & Repair

Car will drive fine on flat roads but when I'm going
up hills and hit 30000 rpm it will not accelerate any
more and engine light will come on when I turn the
car on and off it clears the fault until I hit a hill
again, I've had the air flow sensor replaced but still
have same issue can anyone help

1 Answer


This problem could be the Electronic Throttle Body. It has a ' Drive by Wire' system. Also let the car idle for a while and place your hand as near as the exhaust pipe outlet as possible and check if there is any pressure coming out of the exhaust pipe. The Catalytic Converter could also be blocked. There are two oxygen sensors on your vehicle, An upstream and a down stream oxygen sensor. The upstream sensor is upstream of the CAT near the exhaust manifold and the down stream is below the CAT on the exhaust pipe end. They both feed the car's compuer minute signals of between 200 and 900 mV. The upstream signals flutcuate between these voltages and the down stream keeps a contant voltage of 5 to 800 mV. If the CAT is blocked or has two much restriction the down stream sensor will fluctuate.

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