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Old 02-01-2011, 05:37 PM   #1
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P0128 code - Thermostat


This code came up for my car.

P0128-Thermostat opening too soon causing engine to run cold. (now fixed)

Would this be a possible cause for somewhat low mpg?

Just don't feel my Cavalier is getting the best mileage.

Average at 27mpg (mostly highway)

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Last edited by fjacky; 02-01-2011 at 05:40 PM.
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Old 02-01-2011, 06:50 PM   #2
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P0128 code - Thermostat


Quote:
Would this be a possible cause for somewhat low mpg?
Ayuh,... It'll cause it to run very Rich....

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Old 02-01-2011, 08:39 PM   #3
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P0128 code - Thermostat


mpg in general drops down winter time.
1. engines run colder
2. takes more time for engine to warm up
3. cold engine = more gas used
4. outside colder air = more dense air = more O2 = more gas used
5. dreaded winter gas formulation = more gas used.
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