 » Site Navigation | | | | » Recent Threads | 1999 M3 Swap 09-07-2023 10:10 PM Yesterday 08:18 PM 6 Replies, 318,621 Views | | | |  |  |  |  02-22-2010, 05:16 PM | #1 | | Senior Member Join Date: Dec 2009 Location: Chicago, IL Posts: 181 |  Quick Update
Wow, my car temperature runs fine now [right at 1/2 mark. Cabin air temp is now hot] But the crazy thing is: My MPG went up from 32 on highway to 35.
New thermostat do that to a car? Not from what I have read.... |  |  | | 02-22-2010, 06:12 PM | #2 | | That's not Millpoint Blue Join Date: Apr 2005 Location: BNA Posts: 3,161 |
I vaguely remember something about when the car runs cool due to a faulty thermostat, the ECU (?) will set the air/fuel mixture to be rich in an effort to get it up to proper operating temp. So, it seems logical to me that once the car is at proper operating temp. the ECU wouldn't run rich, which would increase your fuel mileage.
But, I might be imagining ALL of that. LOL __________________ Real men know how to SEARCH!
THIS IS A MILLPOINT BLUE INTERIOR
Mods 'n' stuff: Star Spoke 43 wheels - X-Brace - Mason Engineering front strut brace - CF gauge overlay - ZHP shifter knob - Racing Dynamics cat-back - Doubled brake lights - M-tech rear spoiler
From Page 68 of the 1997 Owners Manual: "Vehicles equipped with ASC+T remain subject to the laws of physics." | | | | | 02-22-2010, 09:35 PM | #3 | | Senior Member Join Date: Aug 2009 Location: Novi, MI Posts: 115 |
Yes, there is built in coolant temp based enrichment. Was your engine running cold enough to where enrichment was happening? No way to know without knowing the tables in the ECU and what temp it was stuck at, but it's a possibility. __________________
Josh | | | | | 02-22-2010, 10:35 PM | #4 | | Senior Member Join Date: Apr 2006 Location: Oxford, Ohio Posts: 868 |
Glad you got it sorted out! | | | | |
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