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  #1  
Old 12-05-2017, 01:01 PM
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Diesel engine malfunction + limp mode...

My first limp mode experience. Holy crap...it sucks. At least on mountain highways, where I do most of my driving. Funny this was, there was nothing that stood out about this happening yesterday - no excessive loads, not crazy cold. It went away after about thirty minutes, by which point I was home anyway. iDrive warning and limp mode went away, CEL remained.

Got a friend to read (and reset, to see what comes back) codes, got 4530 and 4C83. Anyone have any insights?

Well...I can’t resize the ETHOS screenshot. Codes are “charge air pressure control deviation” and “exhaust back-pressure before turbocharger, plausibility.”
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  #2  
Old 12-05-2017, 01:22 PM
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There is an exhaust back pressure sensor on the exhaust manifold. It has a banjo bolt with a hose that goes to the sensor. That hose has been known to fail on the diesels. When it does, you get hot exhaust gases leaking into the engine bay, which can damage the wiring and the vacuum lines nearby.

I would start there. The sensor code could be due to the leak, and the pressure control deviation is indicative of a vacuum line or VSV/pressure converter failure.
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Old 12-05-2017, 03:02 PM
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Quote:
Originally Posted by daytonatrbo View Post
There is an exhaust back pressure sensor on the exhaust manifold. It has a banjo bolt with a hose that goes to the sensor. That hose has been known to fail on the diesels. When it does, you get hot exhaust gases leaking into the engine bay, which can damage the wiring and the vacuum lines nearby.

I would start there. The sensor code could be due to the leak, and the pressure control deviation is indicative of a vacuum line or VSV/pressure converter failure.
Thanks for the quick and good reply! Surprised that was my first post, didn't think I was quite so green. ANYWAY...the issue you're describing, is it the same one outlined here? Likely culprit sounds like the yellow arrow in pic #2.

I've been meaning to do the oil lines for the turbo for a while anyway, but my oil leak is so minimal that I don't even need top-ups between changes. Sounds like had I fixed them I would have solved this issue too?
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Old 12-05-2017, 03:17 PM
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Similar, but that a different leak in the same vicinity.
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  #5  
Old 12-05-2017, 03:23 PM
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See this thread for the issue I’m referring to:

335D Exhaust Fumes in Cabin


“Leak 2”
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Last edited by daytonatrbo; 12-05-2017 at 03:34 PM.
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Old 12-05-2017, 03:24 PM
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Now that I’m looking though, it seems like your code for “before turbo” may not be applicable to this problem.
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Old 12-05-2017, 04:58 PM
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Bit of a guess here, but I'd look at your MAP sensor. Similar codes with other limp mode cases have been reported - here is one example: https://xoutpost.com/bmw-sav-forums/...ap-sensor.html

The MAP sensor is not overly expensive, and fairly easy to get to. Might take about 15 minutes to replace. Many people have tried to clean them, but not sure anyone has had success.

Good luck, and be sure to report back if the MAP sensor is a cure - it will help others to correlate their error codes and fixes.
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Old 12-05-2017, 05:08 PM
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Where the code is for boost control and not boost pressure, I would not start with the MAP sensor. Assuming the code reader’s translations can be trusted.
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  #9  
Old 12-05-2017, 05:35 PM
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Seems like a fouled or failed MAP sensor would have thrown the same code again immediately, right? No codes have reappeared since clearing.

Code reader is a Snap-On, imagine software is current. But I would be HAPPY to get away with just a MAP sensor replacement...
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  #10  
Old 12-05-2017, 06:33 PM
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Plausibility on the Exhaust pressure sensor is less likely to cause limp mode than the charge pressure control fault. The Exhaust pressure sensor is possibly a soft code and still active/pending. You may have a clogged line there. On a plausibility fault, this is supposed to cause the DDE to default to 500 mile regenerations.
With 500 mile regenerations it sure seems possible that your MAP sensor could get fouled.

I had a really hard time with Ethos reading my sensors correctly, Carly was better (zing!), and Ista ended up being required for my application...


Did you try to stop and restart the engine during limp mode?
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