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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.
What else can I help you with?
Would a clogged EGR valve cause a loss of power and poor gas mileage on a 1983 Nissan pickup?
Yes, most definitely.
What would cause poor gas mileage on a 1998 Honda Civic EX?
Maybe the airfilter
A dirty air filter can cause?
Poor performance, poor fuel mileage.
Would the pcv valve effect shifting on your 2005 1500 ram?
Not likely. It would mainly cause a poor running engine.
Can cv joint cause poor fuel mileage on car?
NoNo
What would incorrect ignition timing cause?
Poor performance, poor fuel mileage, spark knock (aka ping), hard starting, engine run on, to name a few.
Why is car burning oil?
Probably worn out piston rings and bad valve seals, the results of high mileage or poor maintenance.
What does a bad PCV valve cause?
oil leak and poor gas milage
Would a cracked serpentine belt result in poor fuel economy?
Yes, it is possible that a cracked serpentine belt will cause poor fuel economy. Many people will have significantly improved gas mileage after changing the belt.
Will a bad catalytic converter cause hard starting?
Yes it will, plus loss of power, & poor mileage.
What would a bad EGR valve gasket cause?
Poor performance, poor economy, rough idle, lean burn causing valve or piston problems...
What would cause poor gas mileage on a 2004 dodge neon sxt?
i know that to make the best and even hire your miles per gallon, drive at an average speed of 40 mph.
