X5 diesel engine noise - With VID.

[Dr. Anthony]

Originally Posted by bawareca

"Plausibility" means that the readings of the sensor are out of the range that is stored in the DDE's maps. If someone can rust test schedules in ISTA that wive a tons of information about the problems and tips to help pinpoint the problem. I am quite sure it is not the sensor(s) itself.

wow, good to know. I believe the sensors were already replaced a couple of years ago too. I can't get inpa/ista working properly on my laptop. I'll see if I can get a friend to check that out for me. I appreciate your help.

[bawareca]

Sure, keep us posted.
I have new versions ISTA/D standalone for WIN7,8 and I can install remotely. The ICOMs are down to under $200 now so a pretty decent system can be had for almost nothing.

[Dr. Anthony]

Originally Posted by bawareca

Sure, keep us posted.
I have new versions ISTA/D standalone for WIN7,8 and I can install remotely. The ICOMs are down to under $200 now so a pretty decent system can be had for almost nothing.

The laptop I use for that is an old windows laptop that I have the bavtech installed on. If you have links to something, I'd definitely consider buying a new setup if I knew i could get it working

The only thing I use the inpa cables for now (I have 2) is to register batteries, and clear codes using bmwlogger on my mac.

Either way, I'll definitely update the thread as I get more info and hopefully resolve it.

[ard]

Originally Posted by Dr. Anthony

You're absolutely right. I've run out of ideas so before it gets too crazy, I'm going to have a friend's indy shop take a look at it for me this afternoon.

Also, the code (3 codes) are all referring to the name nox sensor.

they are:

46B4: NOX Sensor before denox cat plausability nox.
4BB3: Nox sensor before denox cat- plausibility nox
4b6a: Nox sensor before denox cat - Plausibility

to me, I'm reading it as the nox sensor before the cat has died.

Originally Posted by bawareca

"Plausibility" means that the readings of the sensor are out of the range that is stored in the DDE's maps. If someone can rust test schedules in ISTA that wive a tons of information about the problems and tips to help pinpoint the problem. I am quite sure it is not the sensor(s) itself.

I had a 4BB2: SES/CEL: Code 4BB2....Anyone else? - Bimmerfest - BMW Forums

http://www.xoutpost.com/846433-post20.html

Lemoned that car in 2011.

'Code' does not equal 'part'. These cars use the values from the sensor and how they respond after the DDE adjusts other control parameters to trap errors. It may be the sensor is bad, but far more likely it just isnt responding the way engineering said it should (and the DDE expects). You can have a clogged SCR orifice, bad metering value, bad SCR cat, etc, etc. You need to run test plans.


Good luck. This stuff is a PITA.

(Ive just posted my crap to give you a sense of a bad story- lets hope yours is more straightforward.)

[ZetaTre]

Originally Posted by bawareca

Sure, keep us posted.
I have new versions ISTA/D standalone for WIN7,8 and I can install remotely. The ICOMs are down to under $200 now so a pretty decent system can be had for almost nothing.

I sent you a PM. I have Rheingold (and DIS) both working with a 20 bucks connector from Amazon -> Amazon.com: KCRIUS(TM) K+D CAN USB Interface OBD2 Cable Diagnostic Scanner for BMW only: Automotive

All running on a WindowsXP Centrino Sonoma laptop.

I don't think it gets any cheaper...

[Dr. Anthony]

Thanks for the info guys.

Just a bit of an update. I brought it by my friend's shop. We took it for a test drive. It was hard to replicate. (of course) However, we did a bit of a stress test by holding the brake and trying to build some boost stationary. (yep, I know this is hard on the transmission) From that (also had 2 techs listen for it) it sounds like a boost leak somewhere.


We did notice some soot buildup around the bypass valve, and also some soot where the pipe goes into what looks like throttle (is this normal?)

[Dr. Anthony]

Alright, so I thought I would give an update to my issue. Long story short, its not solved yet. But here's what we did do.


Did a smoke test. Everything was good, except... where the wastegate is on the lower turbo. That's where you can see some soot escaping.. So the wastegate bushings/seals are gone.. and Looks like i'll need to pull the turbo off to get it rebuilt or swapped out.

I feel a bit of play. if I hold it closed, the noise goes away. Obviously I don't want to do this long term. I just wanted to see if I could replicate the noise while holding pressure on the wastegate so it doesn't move. Noise could NOT be replicated.

I also scanned for codes with a different machine and was able to get a few more out of it. I'll update the 1st post to show these for others searching.

they are:


4BB3: Nox sensor before denox cat- plausibility nox
4b6a: Nox sensor before denox cat - Plausibility
46B4: NOX Sensor before denox cat plausability nox.
4C04 - I think this could be EGT temp is too high (non-plausible)
4D16 - SCR system, efficiency: Efficiency too low
46A4 - NOx sensor after DeNOx cat., plausibility NOx: NOx signal offset too high at trailing throttle

[boredincl]

Originally Posted by Dr. Anthony

Thanks for the info guys.

Just a bit of an update. I brought it by my friend's shop. We took it for a test drive. It was hard to replicate. (of course) However, we did a bit of a stress test by holding the brake and trying to build some boost stationary. (yep, I know this is hard on the transmission) From that (also had 2 techs listen for it) it sounds like a boost leak somewhere.


We did notice some soot buildup around the bypass valve, and also some soot where the pipe goes into what looks like throttle (is this normal?)

Whats the latest with your X?
I have the same issue/noise so I pulled the inlet air tubes on low pressure turbo (lower big turbo) and the high pressure Turbo (top turbo) to check for shaft play. lower turbo is fine, but the top turbo has play in the shaft which is causing the compressor wheel to rub under full boost. I am in the process of finding a replacement CHRA (center section of turbo) or a rebuilt turbo and have been told buy 2 rebuilders who spoke to Borg Warner that it is a dealer only item.
I am not convinced that that is the case as B/W is having them rebuilt so they must be available unless they are rebuilding it themselves.
Has anyone had luck finding a replacement unit other then through BMW? My turbo part number is 5439 971 0088 (BorgWarner KP39-1873ECD310.12ACCXX) BMW part #11657811405.

[Dr. Anthony]

Originally Posted by boredincl

Whats the latest with your X?
I have the same issue/noise so I pulled the inlet air tubes on low pressure turbo (lower big turbo) and the high pressure Turbo (top turbo) to check for shaft play. lower turbo is fine, but the top turbo has play in the shaft which is causing the compressor wheel to rub under full boost. I am in the process of finding a replacement CHRA (center section of turbo) or a rebuilt turbo and have been told buy 2 rebuilders who spoke to Borg Warner that it is a dealer only item.
I am not convinced that that is the case as B/W is having them rebuilt so they must be available unless they are rebuilding it themselves.
Has anyone had luck finding a replacement unit other then through BMW? My turbo part number is 5439 971 0088 (BorgWarner KP39-1873ECD310.12ACCXX) BMW part #11657811405.

So here's your update... My sound got worse as I put more mileage on the vehicle.

I thought it was my turbos. I bought bohl turbos and had them installed at a shop as I didn't have the time and just wanted it "done" The day it was supposed to be done, the guy calls me and says "There's a manifold stud/bolt on your head thats broken" I asked him to remove it, drill it out.. whatever, just get it done. (I had supplied all new gaskets, bolts, o-rings..etc) He claimed he wasn't able to, but said "it'll be fine.." He bolted it all back together with the new turbos, new seals around all the charge pipes, and a new red chargepipe. He also couldnt find my supplied gaskets that are used for the turbo to the manifold. So he reused my old gaskets. Anyways, he Started it up and got the EXACT SAME SOUND.
Except now, its worse. I should have just done it myself. Anyway, it'll be torn down next week and if I have to rip the head off to have it drilled out, so be it. I'll use all brand new gaskets as well for obvious reasons. But I honestly feel the noise I'm getting is definitely from these gaskets.

my old turbos had some play, but nothing significant. Again, none of the impellers were rubbing against the housing tho.
Hope this helps

TLDR: Replaced turbos, it wasn't the turbos.

[bawareca]

I have discussed this matters with some friends in Europe and turbo problems on a BMW diesels are almost unheard of. Even after upping the stock power 60-70%. And if a turbo wheel rubs against the housing it will be gone in a short time.