1999 4 cyl. frontier drop in mpg

Forum for the Xterra, Frontier and Hardbody, the smaller workhorses of the Nissan lineup!
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arniem
Posts: 3
Joined: Wed Jan 13, 2010 8:16 am
Car: 1999 frontier

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Ive noticed the last year my mpg has gone from 23 to 19. I have replaced o2 sensor, plugs, air filter, fuel filter. PCV valve? Any other suggestions.

Modified by arniem at 7:30 AM 2/16/2010
Modified by arniem at 7:31 AM 2/16/2010

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Rev_D21
Posts: 5946
Joined: Sun Jan 12, 2003 9:49 pm
Car: 1986.5 D21 LB HD 2WD V6 5Speed
1991 D21 Reg 2WD Auto
1995 D21 Reg 2WD 5Spd
1996 D21 Reg 4WD 5Spd
2012 Versa 1.6S 5-Speed
Location: Somwhere in Western NY
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Driving style?
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arniem
Posts: 3
Joined: Wed Jan 13, 2010 8:16 am
Car: 1999 frontier

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SAME DRIVING STYLE....
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RT22
Posts: 841
Joined: Wed Jul 01, 2009 9:55 am
Car: 1991 nissan hardbody

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check for obvious first, vacuum leaks can kill mileage, look around and check the vacuum hoses for cracks or breaks. PCV EGR also can cause it.
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arniem
Posts: 3
Joined: Wed Jan 13, 2010 8:16 am
Car: 1999 frontier

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THANKS...IM GOING TO HAVE THE PCV CHANGED, IF THAT DOES NOT DO IT I I WILL PROCEED WITH ITEMS ON YOUR LIST. THANKS FOR YOUR HELP!
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