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Is it true that if you run your engine too cool (like by using a 160 degree t-stat), the fuel will not properly vaporize and you will run fat, thus telling the PCM to lean things out, and that this will foul-up your 02 sensors and throw a check engine light?

MJJ
 

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matjow said:
Is it true that if you run your engine too cool (like by using a 160 degree t-stat), the fuel will not properly vaporize and you will run fat, thus telling the PCM to lean things out, and that this will foul-up your 02 sensors and throw a check engine light?

MJJ
Yes, it's true that it does hurt performance, mileage, and engine wear a little depending on how cold it goes. Cold air is good because it's more dense, cold engines can give you issues, the most readily apparent is the mileage drop between fillups. You can overcome this with programming a new fule curve with the computer but why go though all the hassle for a $10 part that doesn't provide any real performance or longevity benefits? If you're running too hot that's another issue, to drop maybe 10 degrees on our engines probably isn't bad because most of the temps are for emissions but going extreem and trying to drop to a 160 might cause issues.

There are quite a few sites out there that discuss the issue, here's one:
http://www.enjoythedrive.com/content/?id=8301

Mike
:seeya
 
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