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Gas milage?

Tiny
ZELLDOG93
  • MEMBER
  • 2002 NISSAN SENTRA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 100,600 MILES
Why am I loosing gas milage after an engine rebuild? I also have a leak from my oil pan
Wednesday, December 7th, 2011 AT 9:27 PM

8 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You might be losing because of a tighter engine. If you have an oil leak take it back an dhave them fix it.
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Wednesday, December 7th, 2011 AT 9:33 PM
Tiny
ZELLDOG93
  • MEMBER
  • 111 POSTS
I did the engine rebuild myself and im getting about 300 miles to the tank I looked up how much I was suppsed to get and it said 422 when stock and I have a cold air intake and high proformance spark plugs that ive been using since I bought the car and I was getting almost 500 miles to the tank. The spark plugs are fairly new less then 2,000 miles on them. Could I possibly be loosing that much mileage bc of the cold?
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Wednesday, December 7th, 2011 AT 9:46 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Cold weather will change the mileage significan'tly
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Wednesday, December 7th, 2011 AT 11:07 PM
Tiny
ZELLDOG93
  • MEMBER
  • 111 POSTS
Ok thank you for the info I never realized how much I lost in the cold before till now
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Wednesday, December 7th, 2011 AT 11:35 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Well it should imporve as the engine breaks in as it will get looser which is normal. As long as you dind't screw anything up while putting the engine together you shoud be ok. That owuld be the only other reason for lower fule mileage.
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Wednesday, December 7th, 2011 AT 11:55 PM
Tiny
ZELLDOG93
  • MEMBER
  • 111 POSTS
My car finally thru 2 codes p0455 and p1448
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Wednesday, December 14th, 2011 AT 12:30 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Both of those are evap valve open and gross leak. Check for a blocked or hose left off or blocked giong to teh evap cannister purge. Make sure your gas cap is tight it should click at least 3 times as that can causeit as well. It cold be a bad valve as well, that would be acause for lower fuel economy
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Wednesday, December 14th, 2011 AT 12:37 AM
Tiny
ZELLDOG93
  • MEMBER
  • 111 POSTS
Ok sounds good thanks
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Wednesday, December 14th, 2011 AT 9:49 PM

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