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1996 Satun SL1 poor city mpg

Tiny
DTDODD
  • MEMBER
  • 1996 SATURN SL1
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 126 MILES
Have this car it has about 126K on it. Runs great. Began getting bad gas mileage in town like 14mpg. Chk engine light came on and it was an O2 sensor. I have replaced this and no more check engine light.

Problem - city mpg is still at about 14. This car should be getting like 24-26mpg in the city. Any suggestions as to where to start. HWY mileage is still in the 30's so I am stumped as to what would cause one to dive while the other is still great?
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Friday, July 15th, 2011 AT 3:23 PM

3 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Bad city and good highway thats crazy even if the injectors were dirty and squirting too much fuel it should still effect your highway mileage. Have you checked your coolant temp sensor they go bad all the time on those cars. Also inspect the connector if the inside of the connector is blue or green its corroded and needs to be replaced.
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Friday, July 15th, 2011 AT 5:25 PM
Tiny
DTDODD
  • MEMBER
  • 24 POSTS
Replaced the radiator but haven't checked the coolant temp sensor. How would the sensor or connector cause this issue?
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Friday, July 15th, 2011 AT 7:20 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
That sensor controls how much is given based on coolant temp if it miss reads it always reads colder then actual running temp making it use more fuel and richer.
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Friday, July 15th, 2011 AT 7:25 PM

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