2006 Saturn Ion poor gas mileages

Tiny
JOE1953
  • MEMBER
  • 2006 SATURN ION
  • 2.2L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 142,000 MILES
My car seem like it is burning more gas than it was what could be the cause? I havn't did a tune up on it.
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Tuesday, July 8th, 2014 AT 9:34 PM

5 Replies

Tiny
CARADIODOC
  • EXPERT
1. Misfires / needs a tune-up
2. Dragging brakes
3. Coolant not reaching proper temperature
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Tuesday, July 8th, 2014 AT 11:51 PM
Tiny
JOE1953
  • MEMBER
The temperature gauge run Just above the 1/4 mark do I need to replace the thermostat?
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Wednesday, July 9th, 2014 AT 6:58 AM
Tiny
CARADIODOC
  • EXPERT
With all the electronics the insane engineers are forcing on us, this may no longer apply to your car, but in the past, the dash gauge and the Engine Computer used two different temperature sensors. Sensors for the dash gauge are notoriously inaccurate, but all that's important with those is you notice when there's a sudden change from what you're used to seeing. Sensors for the Engine Computer are much more accurate, and since there will never be two sensors exactly alike, the computer will learn its characteristics by comparing it to other sensor readings and operating conditions.

The only way to know for sure if the engine is reaching proper temperature is to connect a scanner to view live data. That will show you the signal voltage and the corresponding temperature that the computer has calculated. Normal temperature will be around 195 to 220 degrees. If the thermostat is opening too soon, you'll see somewhere around 170 degrees or less.
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Wednesday, July 9th, 2014 AT 10:46 PM
Tiny
JOE1953
  • MEMBER
What type of scanner do I need to use to view live data and where do I purchase it from?
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Thursday, July 10th, 2014 AT 12:29 AM
Tiny
CARADIODOC
  • EXPERT
There's all kinds on eBay. I use the Chrysler DRB3 because it works on all brands of cars but that uses an older computer language. I think you're going to need the "CAN BUSS" system. There are a lot of scanners that cost less than $100.00 but they are very slow. Professionals don't have time to wait for the display to update, but they work okay when you just need a little information.
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Thursday, July 10th, 2014 AT 12:47 AM

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