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Yes; especially on a late-model computer-controlled engine. A stuck-open PCV valve will allow unmetered vacuum to cause a lean air/fuel mixture. The engine management system will "fatten-up" the fuel injection spray time (volume of fuel) to compensate for a lean air/fuel ration, thus using more fuel to accomplish the same task. It can cost you at the pump & cost you in damaged engine-related repairs. Change your air filter every 10K miles & your PCV valve every 25K miles. Run your tire pressures up to the rated pressures on the sidewalls: 35PSI, 44PSI, etc, NOT what the door sticker says. The car manufacturer advises about a 40% reduction from the tire maker's pressure to give the car a soft ride. Look into any large fleet & you'll discover that all their vehicles run at tire maker's pressures to maximize tire life & fuel mileage. I took my 2007 Ford Explorer Sport Trac V8 to 44PSI instead of the 32PSI the door sticker said & got 4 MPG more. Good luck. P.S. I have more than 40 years in the business & run a 1200-vehicle fire department fleet.
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∙ 16y ago
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Would a clogged EGR valve cause a loss of power and poor gas mileage on a 1983 Nissan pickup?
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What would cause poor gas mileage on a 1998 Honda Civic EX?
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NoNo
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Poor performance, poor fuel mileage, spark knock (aka ping), hard starting, engine run on, to name a few.
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oil leak and poor gas milage
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Poor performance, poor economy, rough idle, lean burn causing valve or piston problems...
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i know that to make the best and even hire your miles per gallon, drive at an average speed of 40 mph.
