[2008E92335XI]

hi guys, a couple of weeks back, my SES light came on and the car went into limp mode. It started running really rough. I got the car home and have the following codes:

2A82 - inlet vanos
3100- boost control deactivation
29D2 - cylinder 6 misfire
29DO - cylinder 4 misfire
29CC - misfire multiple cylinders

I intend on replacing both vanos solenoids but was just wondering whether the misfire codes can present with a vanos solenoid issue as well? or are the misfiring issues something completely separate that happened to show up as the same time as the Vanos failing. the Misfiring codes were not there prior to the SES light coming on.

Car is 08 335xi e92 84k miles. plugs were replaced 3k miles ago, coils were replaced and car walnut blasted about 25k miles ago. never replaced fuel injectors. valve cover, OHFG done 3k miles ago.

thanks!

[RayLivingston]

I would:

1) Clear all codes
2) Go for a drive
3) As soon as the SES comes on, read the codes. Hopefully there will be just onde
4) Deal with the first code that comes up.

Often, the first code is the only one that matters. Seeing misfires make me think coils/plugs first.

Regards,
Ray L.

[gbalthrop]

Originally Posted by 2008E92335XI

hi guys, a couple of weeks back, my SES light came on and the car went into limp mode. It started running really rough. I got the car home and have the following codes:

2A82 - inlet vanos
3100- boost control deactivation
29D2 - cylinder 6 misfire
29DO - cylinder 4 misfire
29CC - misfire multiple cylinders

I intend on replacing both vanos solenoids but was just wondering whether the misfire codes can present with a vanos solenoid issue as well? or are the misfiring issues something completely separate that happened to show up as the same time as the Vanos failing. the Misfiring codes were not there prior to the SES light coming on...

I certainly would NOT just throw parts at it. Get a Scan Tool or Software that will read Freeze Frame Data (provides a snapshot of mileage & engine conditions when each code was saved in DME Memory). I would be willing to bet the FF Data is different for the misfire codes versus the 2A82 code. The Fault Code 2A82 (same as P0012) is defined by Bentley as:
P0012 | 2A82 | 'A' Camshaft Position Timing Over-Retarded (Bank 1)

Over-retarded Intake Cam Timing can result from an issue with the Inlet Camshaft Position Sensor signal, low oil pressure at idle from something as stupid-simple as missing Oil Filter Cover Spool on which filter element is mounted, dirty VANOS Solenoid, or loose/ corroded connector on Solenoid or Cam Position Sensor.

Since both the VANOS Solenoids and Cam Position Sensors are identical for each camshaft, if you REALLY have any reason to suspect the VANOS Solenoid, begin by simply cleaning & swapping the two identical solenoids.

FF Data is very important in diagnosing something like this, and you should read ALL of that data saved in the DME BEFORE you clear any codes.

I would bet that the "misfire" codes were set at high load/RPM (triggering the SES light & causing very rough running, probably due to injector shutdown on "misfiring" cylinders), and the 2A82 Over-Retarded Intake Cam Timing was set at LOW RPM. If that is the case, then NO, the two are NOT related.

"Misfire" alone could cause all the codes you see there AND the rough running as if you were running on 4 of 6 cylinders, as you probably were. Please get the FF Data read & post back.

George

[2008E92335XI]

Thank you for the replies. I do have the FF data. I'm not sure how to interpret it, but I'll post it here and hope you all can help:

2A82 code:
Odometer: 84417
Engine speed: 800 rpm
camshaft inlet 69.75 oCRK
camshaft inlet nominal value: 118.80 oCRK
Engine temperature: 104.25oC

29D0: misfire, cylinder 4
Odometer: 84417
Load value for misfire detection: 17.19%
Engine speed: 800 rpm
Lambda integrator group 2: 33.59%

29CC: misfire multiple cylinders
Odometer: 84417
Ambient temp: 15.75 oC
rail pressure: 48,906.64 hPa
Voltage KL 87: 13.20 V
Counter recognition bad road 0.00



I hope this helps. Thanks again for the replies!

[2008E92335XI]

bump. any other thoughts guys? thanks

[RayLivingston]

Do what I suggested. If a misfire on #4 or #6 is the first error, then replace the #4 & #6 coils, and try again.

You might try putting in new plugs, just to rule that out first.

Regards,
Ray L.

[2008E92335XI]

Thanks Ray. I’ll give that shot. Thanks for the advice!

[relative4]

Easy on the parts swapping. Ray's first piece of advice (clear & check codes) was great, the second (replace coils without verification) not so much.

If the 2A82 comes back, clean & swap the solenoids. If the code moves to exhaust, replace the bad solenoid. If the code does not return, great. If the code stays on intake, clean the VANOS filter and improve your oil discipline.

If the misfires come back, swap a misfiring coil with a good cylinder. If the code moves, replace the coil. If not, swap plugs, then injectors. Given the misfires are both on the same bank, a smoke test would also be a good idea.

[2008E92335XI]

Thank you!!! That is very helpful!

[2008E92335XI]

Hey just wanted to update the thread. So I followed the above advice and cleared the codes. When I restarted the car, the only codes I got were for the Vanos Intake 2a82 and boost control. I swapped the solenoids and the code changed to the Vanos outlet. I figured easy fix so I changed out Both solenoids with a oem one’s from Fcpeuro

I cleared the codes and when I restarted the car, the Vanos exhaust code came up again along with the 3100 boost control. I unplugged the solenoid and cleaned off the connector. Cleared the codes and restarted the car. Now it flipped to the Vanos intake code. So I thought let me reconnect and clean the Vanos intake connector. Did that several times and now the car continues to throw the 2a82 intake code.

I thought since the code swapped to the exhaust side, changing the solenoid would be the answer. What am I missing? Thanks for the suggestions guys

[Meeni]

Vanos need proper oil pressure. Verify that you have enough oil, that the oil filter is clear, that the oil bypass valve is operating and not broken (mine disapeared in the engine one time), and then look at the vanos filters, on the passenger side of the head (there's a subject about them that was bumped this week).

Misfires cannot cause a vanos code, on the contrary, a vanos code can and often will result in misfiring if bad enough.

[relative4]

Clean the VANOS filter. What is the type and age of your current oil? How often do you change it, and what type(s) do you use?

[2008E92335XI]

Originally Posted by Meeni

Vanos need proper oil pressure. Verify that you have enough oil, that the oil filter is clear, that the oil bypass valve is operating and not broken (mine disapeared in the engine one time), and then look at the vanos filters, on the passenger side of the head (there's a subject about them that was bumped this week).

Misfires cannot cause a vanos code, on the contrary, a vanos code can and often will result in misfiring if bad enough.

thank you for the reply! oil level and filter all good. im not familiar with what an oil bypass valve is...do you mind clarifying so i can check it out?

I actually just read that thread on the vanos filters and will give that a shot. hopefully that resolves it.

[2008E92335XI]

Originally Posted by relative4

Clean the VANOS filter. What is the type and age of your current oil? How often do you change it, and what type(s) do you use?

thanks relative. i will clean the filters as you suggested. is this the DIY thread you believe is best? https://www.e90post.com/forums/showthread.php?t=1096694


also, last oil change was about 3000 miles ago when the OHFG and VCG were replaced. those seem to be good with no visible leaks. I have used Castrol Edge 0w-40 advanced full synthetic motor oil.

thanks again for the input!

[Meeni]

Originally Posted by 2008E92335XI

thank you for the reply! oil level and filter all good. im not familiar with what an oil bypass valve is...do you mind clarifying so i can check it out?

I actually just read that thread on the vanos filters and will give that a shot. hopefully that resolves it.

The oil bypass valve is part of the plastic plunger attached to the OFH cap. There is sort of a mesh cage with a spring valve in the center that goes in the middle of the paper filter. That piece can break or get stuck, resulting in unfiltered oil moving around and low oil pressure. Visual inspection of the oil filter cap should tell you all you need to know.

The DIY for the filters describe exactly how I did it myself, and going through the wheel well is definitely the way to go. Doing it from the top is a lot more time consuming working blind with no clearance.

I would look further into that boost error code. I do not have a turbo car, but I remember that this error may cause (fake) vanos codes. Look into it before spending money on parts.

[2008E92335XI]

Update for you all. So I pulled out the check valves. From the outside, they look pretty good. No sludge that I can see. However, because they are such a pain to take in and out, do you think I will be better off just replacing them? Is it possible that, although the valves look clean, an internal mechanism may not be functioning correctly? Just wanna check before I spend the money. Thanks again for guiding me through this!

[2008E92335XI]

Well just to update the thread..it turns out when I replaced the solenoids, I had flipped the connectors on the intake and exhaust solenoids. Stupid me lol. Hopefully someone can else learn from my dumb mistake haha

[macheff03]

Originally Posted by 2008E92335XI

Well just to update the thread..it turns out when I replaced the solenoids, I had flipped the connectors on the intake and exhaust solenoids. Stupid me lol. Hopefully someone can else learn from my dumb mistake haha

And that fixed it I would imagine...

[2008E92335XI]

Originally Posted by macheff03

And that fixed it I would imagine...

All is well...for now