Posted by Bob on February 25, 2009 at 17:27:14 from (69.178.228.68):
In Reply to: Vacuum Gauges posted by 1 Dollar on February 25, 2009 at 16:51:44:
On carbureted vehicles, when you lug the engine, the "load enrichment circuit" (power valve) opens to allow extra fuel into the mixture, and MPH rapidly goes to hell.
With modern fuel injection, the oxygen sensor provides feedback, so even while lugging, the 'puter dumps only the necessary amount of fuel into the mixture.
So, watching the vacuum gauge isn't as important as it used to be in the carb era, as a "closed loop" engine can lug in overdrive and still get good mileage.
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