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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > Curious about this observation when engine warming up



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      05-17-2022, 06:50 PM   #1
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Curious about this observation when engine warming up

I've been meaning to ask this for a while, but is there some function/governor when the car is achieving operating temperature to decrease power? I let the car warm up for about a minute, more when it's cold out. When I'm driving down the highway I can literally feel the car gaining power at almost the same spot every time. Like, I'm cruising and the MPG needle is at 30 or so, then something happens and the car seems to pick up a bit and the needle goes more towards 50. I don't think it's any concern, just curious as to what it is if anybody knows or has experienced the same thing...glow plugs shutting off, some built in tranny function till the ATF gets to temp?
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      05-18-2022, 09:26 AM   #2
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How long after you start driving are you on the highway?
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      05-18-2022, 06:26 PM   #3
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So, I'll let it warm up for about a minute, drive half mile to the hwy then 35 to 45 to 55 over a mile. I'm about 3 miles in total when it happens. I haven't ran a log yet to see if it's a temp related thing. Another example would be today when I got to work. I had to run to the store about 5 hrs after it was parked. It happened again, but much sooner so that's why I'm guessing it's temp related, just wondering why...or maybe something's not right?
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      05-19-2022, 02:29 PM   #4
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You could run cluster temperature menus. Google unlocking E90 cluster menus. Several youtube videos on this.

Just have menu 7 up (engine coolant temp)
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