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1995 GMC Safari low gas milage-loss of power

Tiny
DAVID PETH
  • MEMBER
  • 1995 GMC SAFARI
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
I was used to getting between 20 to 25 mpg. Then I had to have the fuel pump and filter replaced and had a full tune-up done and since then I have had poor milage preformance and a loss of power. The engine seems to run smooth and starts very easy and does not burn oil. What can I do?
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Wednesday, January 21st, 2009 AT 12:05 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi:
If the engine is running well and it started since the tune up, that is a good question. Make sure when they were doing the tune up they didn't remove vacuum hoses and forget to replace them (listen for vacuum leaks). Also, a common cause of poor fuel mileage is a bad O2 sensor. Is the check engine light coming on?

Let me know what you find.

Joe
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Wednesday, January 21st, 2009 AT 7:31 PM

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