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      11-04-2014, 11:09 AM   #1
CalBMW335i
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335i Engine Temp Question

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I picked up a 2014 335i about 4 months ago and love everything about it. I had a question I was hoping you guys with more experience can help me answer. So I was commuting to work this morning (usually 30 mile drive on the highway) and when I got off the highway, I noticed my engine temp fell down to 160 (1/4 mark). Not only did the engine temp dip, but I felt the car was more sluggish and the throttle not as responsive. My car usually runs closer to the 250 mark. It was about high 40sF/low 50Fs and I was sitting in some stop and go traffic for 10-15min prior to exiting the highway, but I've never noticed the temp dip so dramatically after having driven the car for like 35-40 minutes. I didn't get any warning lights and when I checked the status of my car, it said all systems were fine. I drove it around the block a few times harder and the engine temp started rising again so I figured it was fine. Is this normal for the temp to dip so low after driving for so long?
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      11-04-2014, 11:17 AM   #2
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Thats oil temp, not engine (coolant) temp.

If I remember correctly, the oil temp varies based on the mode youre in.
I think Eco Pro runs in the hottest.

I need to find those numbers...
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      11-04-2014, 11:21 AM   #3
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Yes, I mean oil temp. Thanks for clarifying. I was in comfort mode. I was just worried because I've never had the temp dip like that with loss of power. I'm hoping it was just because it was "cold" (40/50s is really not that cold to me).
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      11-04-2014, 12:02 PM   #4
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Sounds like Limp Mode to me. Do a search on Limp mode and you'll read all about it.
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      11-04-2014, 12:06 PM   #5
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Limp mode without an engine check light. Losing power is not normal. It's interesting that power and response returned, did you restart the car or did you just keep driving until it returned to normal?
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      11-04-2014, 12:07 PM   #6
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Mine hovers around the 1/4 mark unless I'm pushing it above 3K with "sporty" throttling.

What mode were you in? If you're sitting in traffic you're definitely not pushing it hard ... so nothing seems surprising here.
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      11-04-2014, 12:11 PM   #7
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Thanks for the replies. I was in comfort mode. When I felt the loss of power, I pulled over and turned off the car and restarted it a few minutes later. Thats when I started pushing it a little harder and noticed the temp go back up with return of power. I've heard of limp mode, but haven't read much about it. I thought it happens when you keep switching between modes while driving. If this was limp mode, is it something that I need to bring the car in for service?

Dwalls90. My car is always closer to 250. I mean after driving for like 15-20 minutes, it pretty much stays just slightly left of 250. Thats why I was alarmed that it was at 160 after 40 minutes of driving, but I was again stuck in slow traffic on the freeway on a cold morning.
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      11-04-2014, 04:38 PM   #8
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Quote:
Originally Posted by CalBMW335i View Post
Thanks for the replies. I was in comfort mode. When I felt the loss of power, I pulled over and turned off the car and restarted it a few minutes later. Thats when I started pushing it a little harder and noticed the temp go back up with return of power. I've heard of limp mode, but haven't read much about it. I thought it happens when you keep switching between modes while driving. If this was limp mode, is it something that I need to bring the car in for service?

Dwalls90. My car is always closer to 250. I mean after driving for like 15-20 minutes, it pretty much stays just slightly left of 250. Thats why I was alarmed that it was at 160 after 40 minutes of driving, but I was again stuck in slow traffic on the freeway on a cold morning.
Yeah, restarting will clear it up and the car reverts to normal conditions with an operating oil temp of 200-250 degrees. I've brought my car in and complained of the faults but it cannot be replicated with how seldom it happens on my specific car - 160 degree oil temp and loss of power but no check light. It wouldn't hurt to bring it in but I'd venture a guess that you won't get full resolution but at least it would be documented.
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      11-05-2014, 11:00 AM   #9
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This is exactly what my car is at the dealer's for right now. It's intermittent, and there is a fault code associated with it (1A2108) that occurs when the aux cooling fan on the oil cooler goes into full-speed mode (which is why the oil temp drops). I'll let everyone know what the outcome is when I get my car back.
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      11-05-2014, 01:14 PM   #10
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Thanks again for the replies. I was reading about limp mode, and it seem to be an issue with the M-Sport primarily. I have a sport line. Anyone with a sport line that has this issue?
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      11-05-2014, 01:35 PM   #11
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Quote:
Originally Posted by roundel335 View Post
This is exactly what my car is at the dealer's for right now. It's intermittent, and there is a fault code associated with it (1A2108) that occurs when the aux cooling fan on the oil cooler goes into full-speed mode (which is why the oil temp drops). I'll let everyone know what the outcome is when I get my car back.
Please keep us posted. I have an appointment in a couple of weeks for the same thing as well.
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      11-05-2014, 02:04 PM   #12
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Notice full throttle from 2,000 RPM to 4,000 RPM



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      11-05-2014, 02:05 PM   #13
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Cooling fan. Notice low engine oil temp as well.


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      11-05-2014, 04:12 PM   #14
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Got a call from the dealership awhile ago - they're overnighting an aux cooling fan for the oil cooler and will install it tomorrow. I should get the car back in the afternoon. This is the second fan that's gone bad since I got the car in March 2013. First fan went out at the end of June 2013, and again a few days ago.
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