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1999 Chevy Blazer gas mileage

Tiny
GJENN70718
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 99,000 MILES
New jasper engine(3000mls) car gets only 10-12 mpg. What should I look for to fix this? O2 sensor or something else? All new plugs and wires came with engine. What would you suggest. It should get 16-18 mpg
Wednesday, December 2nd, 2009 AT 7:06 PM

2 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
I would first check the coolant temp sensor. Now it you would and have a digital multi meter then unplug the coolant temp sensor and ohm it. Do this when it is cold and get back to me the ohm's reading and the air temp at the time of test.
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Thursday, December 3rd, 2009 AT 10:38 AM
Tiny
TUNEUP1200
  • MEMBER
  • 18 POSTS
How many RPM's are showing when you're doing about 60MPH?
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Thursday, December 10th, 2009 AT 11:27 AM

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