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      08-14-2017, 11:42 AM   #1
Matticus91
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Thumbs down New CEL and Engine Malfunction... This car will be the death of me

Here we go again! Car is off to the shop because this one is beyond me. Started getting some new symptoms last week:
  • Rev hunting
  • Lurching on constant throttle
  • Loud and variable DV noise on constant throttle with VERY inconsistent throttle response
  • Low/no boost and finally hit limp mode over the weekend
  • Car stalling on stops
  • Engine malfunction warning with reduced engine power following

Codes:
2e0f - Valvetronic system: disabled, too frequent (???)
29d0 - Intake air temperature sensor, electrical: Short circuit to B+
2c57 - Reduced power mode / Boost disabled
2775 - Airmass too low - Possible boost leak


2c90 - Blow-off valve, mechanics: Jammed closed (Tuner code, disregard)
3166 - Tank safety valve: malfunction (Tuner code on N55/JB4, disregard)


These issues have been present in Map 1, Map 5, AND Map 0 (jb4 "off").

UPDATE - This has been resolved and was due to a few issues combined, I'll try to include them all here for future reference if anyone else has similar problems.

Issue number one:
Car was in need of a DME update which was causing the valvetronic malfunction, IAT issue, and 29d0 and 2e0f codes. TSB info on this below:

TSB: BMW SI B12 36 15

Which (in no short terms) covers Valvetronic system and "air mass plausibility" faults, among others.

The fix is a DME update and mechanical repairs if needed (if the power surges caused damage). Thankfully I did not need any mechanical repairs and the guys were kind enough not to charge me diag. So a $200 software update plus a night without Tobias and I'm back on the road as of today. The ride home definitely felt smoother but the real test will be cold starts and more seat time. Another part of the fix is listed below regarding a fuel tank vent valve.

Hope this thread might help someone in the future, the TSB also applies to the N20 and N26. Some other codes that may display are:

E-series with BN2000:
2775 - Air Mass, plausibility: Air mass too low
2c57 - Charging pressure control, plausibility: Pressure too low
2dce - Valvetronic System: No adjustment possible
3164 - Fuel tank ventilation system, 2nd inlet point: Malfunction

F-series with BN2020:

102002 - Air Mass, plausibility: Air mass too low
120308 - Charging pressure control, plausibility: Pressure too low
133b04 - Valvetronic System: No adjustment possible
191c02 - Fuel tank ventilation system, 2nd inlet point: Malfunction

Route cause of the issue is a defective valvetronic or tank ventilation component/Erroneous faults set due to DME software parameters.

Funny thing is the BMW dealership saw these codes and replaced the tank ventilation component back when my water pump died, if you look at that thread you can see it listed on the receipt the invoice I posted.


Issue number two:
Bad firmware on JB4 + bad spark plugs/coils - symptoms were engine malfunction, boost inconsistencies, and other codes. This was resolved quickly and easily by speaking with Terry and Jon at Burger tuning who provided me with a firmware update that seems to have solved my overboost/peakiness issues completely.

I also installed Burger's listed NGK 1-Step colder spark plugs, as well as new coils, just to be safe. I did not have any listed missfires but this should ensure a clean and accurate burn from now on.

Issue number three:
Flex Fuel or "FF" harness for JB4 was not connected. On the Burger tuning site it says this harness is OPTIONAL. However after some digging I discovered that even if you do not plan to run ethanol you should connect this harness. Symptoms from this being left disconnected include throttle response and stalling.

Testing & Validation:
I've now been running the car for a week with the JB4 in and all of the above repairs in place. I have not had any further engine malfunctions or codes other than the typical JB4 tuner codes and the valve code for having the muffler flap blocked (golf tee mod). Additionally, there is no further sign of any of the symptoms listed above. The throttle response isn't completely flat, nor is the power curve, but that is expected with the JB4/any piggyback tune.

I've also run quite a few logs on the JB4 and have not seen any issues with under/overboosting - actual boost is consistently within +/- 1 PSI of target, which is in spec. The only thing I've been noticing is some leaning out at certain times, which is typical of the JB4/any N55 tune, but I will be watching this and keeping an eye out for any fuel pump errors.

TL;DR - everything is fixed after the above repairs and no issues have returned so far. Hope this helps someone in the future!
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Last edited by Matticus91; 09-05-2017 at 12:30 PM..
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      08-14-2017, 12:42 PM   #2
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Quote:
Originally Posted by Matticus91 View Post
Here we go again! Car is off to the shop because this one is beyond me. Started getting some new symptoms last week:
  • Rev hunting
  • Lurching on constant throttle
  • Code 2e0f and 2c90
  • Loud and variable DV noise on constant throttle
  • Low/no boost and finally hit limp mode over the weekend

Thoughts are welcome as always. Will update when the shop gets some info for me.
You know you are having a bad day when . . . . .
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      08-14-2017, 01:25 PM   #3
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I'm guessing you never got a lucky rabbit's foot that I suggested a while ago.

On a serious note... possible JB4 issue?
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      08-14-2017, 01:28 PM   #4
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Get an N55 they said. It'll be more reliable they said.
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ACF PTE 6062 BB Top Mount ST Kit, Fuel-It! Stage 3 LPFP, Phoenix Racing Port Injection Manifold + RACE FMIC, JB4 + BMS ST E85 PI BEF
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      08-14-2017, 01:30 PM   #5
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Sounds like it's similar symptoms to the thread you ran from early June through mid July-
Long trip coming up, CEL came on with these codes


Anything ever get done for your VANOS? What you're describing here could certainly be part of that whole business...
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      08-14-2017, 01:59 PM   #6
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Quote:
Originally Posted by chadillac2000 View Post
Get an N55 they said. It'll be more reliable they said.
The N55 is very reliable however when you mod it you open yourself to the possibility of new issues.
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      08-14-2017, 02:33 PM   #7
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Bad Throttle Body?
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      08-14-2017, 05:42 PM   #8
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Quote:
Originally Posted by 1and1 View Post
Sounds like it's similar symptoms to the thread you ran from early June through mid July-
Long trip coming up, CEL came on with these codes


Anything ever get done for your VANOS? What you're describing here could certainly be part of that whole business...
Yep symptoms had gone away when I took out the JB4 for a while but they came back - now it's sounding like it's related to a TSB calling for a system update so I'm waiting on that now lol
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      08-14-2017, 06:02 PM   #9
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Question from ignorance- Is BMW using the VANOS throttle control on anything else besides the N55?

I'm geek enough to really like the no throttle body concept and appreciate what it can bring to the table, but old enough to be able to vacuum balance a triple carb setup. Frankly this was one of the reasons I went with a N54....
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      08-14-2017, 06:19 PM   #10
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That sucks. Matticus = good poster!
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      08-14-2017, 06:30 PM   #11
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Sounds like a problem which was only elucidated early due to the tune. Good luck Matticus. Hope you get it sorted buddy.
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      08-15-2017, 01:13 PM   #12
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Quote:
Originally Posted by Esteban View Post
I'm guessing you never got a lucky rabbit's foot that I suggested a while ago.

On a serious note... possible JB4 issue?
Quote:
Originally Posted by ShocknAwe View Post
Sounds like a problem which was only elucidated early due to the tune. Good luck Matticus. Hope you get it sorted buddy.
Lol Esteban and yes it's definitely been brought to light early due to the extra boost via JB4. I took it out and drove to the shop and had less issues, but still rev hunting and some peakiness in the power curve.

Quote:
Originally Posted by chadillac2000 View Post
Get an N55 they said. It'll be more reliable they said.
Makes me wish I had just gotten an 08 at half the price honestly. I'd probably be right on your tail with the turbo modifications and in less repairs lol. Tally for 1.5yrs ownership has just tilted $10k in repairs

Quote:
Originally Posted by infinitekid2002 View Post
That sucks. Matticus = good poster!
Awe shucks

Alright so here's the update all! Brought 'er in to RRT Performance in Sterling VA, huge pain in the ass to get there since it's a 45min drive on a good day (and we're talking DC traffic here), but they're great guys and I try to go when possible. They did some testing and diag and found a TSB that indicated all the same symptoms and fault codes in the DME.

TSB: BMW SI B12 36 15

Which (in no short terms) covers Valvetronic system and "air mass plausibility" faults, among others.

The fix is a DME update and mechanical repairs if needed (if the power surges caused damage). Thankfully I did not need any mechanical repairs and the guys were kind enough not to charge me diag. So a $200 software update plus a night without Tobias and I'm back on the road as of today. The ride home definitely felt smoother but the real test will be cold starts and more seat time.

Hope this thread might help someone in the future, the TSB also applies to the N20 and N26. Some other codes that may display are:

E-series with BN2000:
2775 - Air Mass, plausibility: Air mass too low
2c57 - Charging pressure control, plausibility: Pressure too low
2dce - Valvetronic System: No adjustment possible
3164 - Fuel tank ventilation system, 2nd inlet point: Malfunction

F-series with BN2020:

102002 - Air Mass, plausibility: Air mass too low
120308 - Charging pressure control, plausibility: Pressure too low
133b04 - Valvetronic System: No adjustment possible
191c02 - Fuel tank ventilation system, 2nd inlet point: Malfunction

Route cause of the issue is a defective valvetronic or tank ventilation component/Erroneous faults set due to DME software parameters.

Funny thing is the BMW dealership saw these codes and replaced the tank ventilation component back when my water pump died, if you look at that thread you can see it listed on the receipt the invoice I posted.

So, time to shoehorn the JB4 back in there and see what the additional boost does. If everything is peachy I'll be happy as a clam and my rear tires will be very sad once again
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      08-15-2017, 01:41 PM   #13
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Here's hoping all goes well.
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      08-16-2017, 03:45 PM   #14
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Quote:
Originally Posted by Esteban View Post
Here's hoping all goes well.
Day 2 and still no symptoms! I'm going to put the JB4 back in tomorrow if everything seems good still.
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      08-16-2017, 04:39 PM   #15
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Matticus, has your third party warranty been affected by the aftermarket stuff at all? I know you took the Jb4 off but do they give you any crap about the charge-pipe or anything else?
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      08-16-2017, 04:44 PM   #16
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Matticus, has your third party warranty been affected by the aftermarket stuff at all? I know you took the Jb4 off but do they give you any crap about the charge-pipe or anything else?
No but it also helps to have a shop that's understanding
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      08-16-2017, 04:56 PM   #17
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Quote:
Originally Posted by Matticus91 View Post
Tally for 1.5yrs ownership has just tilted $10k in repairs
That's some Fiat level of repair bills right there.

So the TSB is for all N55 135i's, then?
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      08-16-2017, 05:04 PM   #18
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I'm just counting the days until I get a huge repair bill. So far in my few years of ownership it's only been spark plugs (my own doing) and waterpump/tstat. Did they mention if this is a new TSB? I did the other one before I went and got a local to do the PPK to help with lurching because I stalled on the highway (lucky in stop dead traffic). Might just go and get this done for preventative.

Glad it was something simple and not a big bill.
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      08-16-2017, 05:17 PM   #19
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Quote:
Originally Posted by quicksilver3121 View Post
Matticus, has your third party warranty been affected by the aftermarket stuff at all? I know you took the Jb4 off but do they give you any crap about the charge-pipe or anything else?
Speaking of charge pipes I wanted to get an ER charge pipe because of how weak the stock plastic ones are but haven't (yet) because they are not CA legal, and I had my car smog tested the other week and they did a pretty thorough visual under my hood and I'll bet they would've noticed if I had aftermarket charge pipe. I'm gonna be pissed if/when my plastic one blows. I have a small tune but I hear they fail even under stock boost.
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      08-16-2017, 05:26 PM   #20
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Quote:
Originally Posted by Esteban View Post
Speaking of charge pipes I wanted to get an ER charge pipe because of how weak the stock plastic ones are but haven't (yet) because they are not CA legal, and I had my car smog tested the other week and they did a pretty thorough visual under my hood and I'll bet they would've noticed if I had aftermarket charge pipe. I'm gonna be pissed if/when my plastic one blows. I have a small tune but I hear they fail even under stock boost.
Is any turbo modification illegal in CA due to emissions regulation or something? That really sucks if you can't do something as innocuous as replacing a POS charge-pipe. Especially if it won't really affect emissions.
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      08-16-2017, 05:55 PM   #21
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Quote:
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Bad Throttle Body?
Throttle body? What throttle body?
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      08-16-2017, 06:01 PM   #22
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Quote:
Originally Posted by quicksilver3121 View Post
Is any turbo modification illegal in CA due to emissions regulation or something? That really sucks if you can't do something as innocuous as replacing a POS charge-pipe. Especially if it won't really affect emissions.
I have a Dinan tune, which is legal in all 50 states, and one of the reasons I have it, plus the BMW Performance exhaust, which is also legal. Because of our strict laws many mods are not CARB (California Air Resources Board) legal here.

Sorry for threadjacking Matticus91.
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