Not really. If the ECM is not setting any troulbe codes, this means it thinks everything is OK. The only thing you might do, is connect a mobile diagnostic unit to monitor the sensor perametors as you're driving to see what ranges they are working in. Even this would be difficult as you would have to be watching the monitor and writing instead of watching the road. Question; Do you do a lot of city driving verses highway? This would be a major factor in fuel consumption. I'm not saying changing ECMs will instantly increase your mileage. There are too many "if's" here. If, it were possible to "borrow" another ECM, just to try it, would be interesting. There are, so called, performance Eproms "chips" available in the aftermarket that claim improvement in economy and performance. But, I've personally had little experience with them. You may want to check these out. Hope I have helped you in some small way.
Tuesday, March 10th, 2009 AT 10:36 AM