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2006 gmc envoy_slt
4 Posts
Discussion Starter #1
Just purchased a 2006 Envoy 4.2 - 119K. Threw a P0128 code and had it reset and I've found lots of information (t-stat) on the code.

I've got a couple of questions:
1 - What is the optimal temperature that I should look for? Right now it's showing a hash-mark or 2 short of 210 degrees F. Is that OK?

2 - I've had it less than a week and the "average mileage" on the PIC registered a whopping 15.4 MPG.....I have read that the temperature can have a difference with the mileage. Would a new t-stat help to improve the mielage? Obviously it has been run by someone else so I reset the guage and will monitor my usage, but if anyone has any rules-of-thumb I'm open for suggestions.

Thanks all!:)
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