1995 GMC Safari low gas milage-loss of power

1995 GMC SAFARI
104,000 MILES • 6 CYL • 2WD • AUTOMATIC
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DAVID PETH
  • MEMBER
  • 1 POST
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?
Jan 21, 2009 at 4:05 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 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
Jan 21, 2009 at 11:31 AM
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