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      08-09-2012, 12:44 PM   #1
int2str's Avatar

Drives: 2008 135i
Join Date: Feb 2010
Location: San Diego, CA

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N54: Limp mode w/o check-engine light?

At a recent autocross, my car seemingly went into limp mode. But no reduced-engine-power, check-engine or service-engine-soon light came on. Symptoms were severely reduced power and the car would no longer rev very happily.

This happened after 4 continuous (circuit), hard laps, parking the car briefly (1-2 mins) and then firing it up again for another lap. The car did not complete the lap because of the reduced power.

Oil temps seemed to peak around 260f-265f. I can check the log later if necessary.

My questions:

1. Does this sound like limp mode to you or point to a different problem?

2. Would reducing the oil temps (i.e. getting an oil cooler) prevent this problem?

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      08-09-2012, 04:32 PM   #2
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Drives: C6 ZO6
Join Date: Sep 2009
Location: Socal

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Yes it does sound like a limp mode and just because the dash showed nothing really does not mean it was not in limp mode. I have had this happen to me before and that was on a cool night with a short blast through 4th. No CES light or anything, but there was still a code for a misfire in cylinder 4. If it is running fine now just try to get it to do it again and maybe it will toss a light then take it to the dealer.
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