B&D, what make, model and year do you have? Just because it doesn't have an EGR valve doesn't mean it doesn't have Exhaust Gas Recirculation. Without EGR, timing has to be retarded to prevent pinging AKA spark knock. Bringing the timing back increases fuel usage, and no EGR increases oxides of nitrogen, the main ingredient in photo chemical smog. Catalytic converters have no effect on oxides of nitrogen. GM has eliminated EGR valves by going to variable cam timing. By going to variable cam timing the "power band" of an engine can be extended over a broader RPM range. EGR can be done more accurately with cam timing than introducing it through the intake where no 2 cylinders get the same amount. Removing a properly functioning EGR valve from an engine will not ever increase fuel economy or power. Most of the time it will have an adverse effect.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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