Quote:
Originally Posted by Ganque
*** N55 w/DCT issues resolved***
Hey everyone! I've been having issues with my DCT when the AC was on for a while now... Months and months of research and I've finally found the solution!
I've been having an issue with my car for a few months now, actually it started after installing my BMS Intake for the N55 engine. The car started to act weird whenever the AC is on and coming to a stop. I've been doing research for months trying to address this, and thinking that could be anything else but the BMS Intake. I checked on several forums in so many languages, most of them said that the symptoms matched with a Service Bulletin (SIB 12 15 14), and 99% of the times I posted my issue people replied back saying that this is a software issue and I should go to the dealer to get my DME updated.... I did it twice, and got charged for getting my DME updated twice because I'm out of warranty... So I've spend around $400 USD just trying to get this resolved by the dealership, of course no luck and still having the problem.
Let me try to explain you the details on what was my issue:
Symptoms:
- Engine Stuttering at low RPMs when coming to a stop only with AC on.
- Jerkiness Stalling with A/C
- Car jumps forward when coming to a stop... it kinda feels like when doing a "heel-toe" downshift from 2nd gear to 1st gear including a knock noise from the engine fighting to keep it running on very low RPMs.
- The car started to have these issues since I installed the intake, I did not touch the MAF sensor or anything else.
Current mods on my car:
- JB4 with ISO mod and JB4 connect kit
- BMS Intake
- Helix FMIC
- Megan Racing Downpipe
- Mid resonator deleted
- COBB Chargepipe
Actions already taken to attempt to fix the issue:
- Took the car to the dealer for a software update (Mentioned the SIB 12 15 14) twice...... Didn't fix it
- Did a DCT adaptations reset via Tool32 on a K+DCAN cable.... Didn't fix it
- Did a Throttle Adaptations reset (regular pedal procedure)...... Didn't fix it
- Updated my JB4 firmware to the latest version and switched to Map 5.... Didn't fix it
- Regular oil change on the N55 engine.... Didn't fix it
- Scanned the car for old codes... No codes saved
- Checked for Boost or Vaccum leaks... No leaks found
So after 5 months of just trying to live with this issue on hot summer days here in Mexico, I was even thinking on getting rid of the car... Someone in one of the million posts I made asking for a solution told me this:
"It's your bms intake go back to stock intake problem solved"
After all the issues that I've been going through I decided to switch back to the OEM Intake.... and that was it!
No more fluctuation and jumps at low RPMS, holly cow. It's funny how I spent months on doing research, looking everywhere except for the intake.
Now, the thing is, isn't this something that BMS should be aware of and warn the customers when ordering their products?
Even if it's only under specific engine, transmission and mods, it still needs to be addressed, and I'd like to have a refund on my BMS Intake... or any other compensation, I now know that I can't have an intake on my car which sucks so bad.
So in theory, the BMS Intake was getting more air during low RPMs which made the engine run lean at a certain point during the downshift from 2nd to 1st gear, so when the DCT tries to do the RPM matching action the RPMs are higher than expected.
So after all this bible... here are the steps to perform when trying to detect and fix the issue:
1) Make sure the issue happens with a DCT (or DKG) transmission with the AC on.
2) If so, please check your current software version on your DME, if you don't have a K+DCAN cable or access to ISTA/D please take your vehicle to the dealership and ask for a software update. If you are out of warranty they will charge you somewhere ~$100-$200 USD to update it depending on the amount of modules your car requires an update.
3) If this doesn't fix your issue check your engine, if you have an intake, put back in the stock one and take it for a test drive.
4) If the issue is still happening, do a boost leak and vaccum leak test.
5) Depending on your milleage make sure to do service on your DCT every 30k miles.
6) Check for Spark plugs and coils.
7) Perform a LPFP and HPFP test.
Hope this information helps anyone who might be having the same issue.
Cheers!
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I have the same issue, thanks for the update, I will try to remove my intake and see if that works.