Wednesday, February 06, 2008

Checking MPG

Feb 3rd Drove to Niagara Falls and back with Water4Gas turned off to get baseline MPG which was 24.2 MPG. Spoke to a mechanic regarding fuel economy on this vehicle, a 2003 Chevy Venture with 3.4 Litre engine with 151,360 kms on it and he said the 24 mpg was quite good.

Feb 4th Drove out towards N Falls and back 68.97 miles with W4G turned on and output connected between Air filter and throttle body. Mileage went up to 25.17 MPG.

Feb 5th Drove out towards N Falls and back 40.4 miles with W4G turned on and connected to intake manifold via PCV line. Mileage went down to 20.47 MPG. All of the above runs were at a speed of about 55 mph.

The PCM (Power Control Module) with associated sensors appears to nulify my attempts to increase gas mileage. Additional oxygen in the exhaust manifold is detected by the Oxygen Sensor and tells the PCM that the mixture is too lean and therefore signals for more fuel to be added. Have to overide some of the sensors to get proper results.

Feb 6th I built a MAF Sensor (Mass Air Flow) Enhancer and will install it shortly. The reason I am working on the MAF Sensor is that most mechanics suggest that it is usually the problem for poor mileage and should be replaced. The Oxygen and MAP (Manifold Absolute Pressure) sensors are not even mentioned when talking about fuel economy......


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