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Re: Loss of power and excessive fuel consumption
Just to add to what jdmccright has already said.
The amount of fuel delivered to the engine is based on Throttle Position, MAP Sensor value and Engine Coolant Temperature.
A leaky vacuum hose to the MAP (or bad MAP sensor) can cause too much fuel to be delivered. If the vacuum port is clogged, it will also cause the MAP to report an incorrect value. A bad ECT sensor can also affect mileage.
A bad O2 sensor will also affect mileage.
Loss of power can also be mechanical, such as a jumped timing chain or clogged exhaust.
What is the fuel pressure?
//2000CAYukon
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