[DBMatt]

Unearthing old thread... sorry.

Just to be clear, some people actually run their cars without Valvetronic on purpose??

I ask because I currently have an issue with my N55 M135i Valvetronic (I know this is E90 but I can barely find anything discussing this). I get a CEL and an error code 133E10 which says “valvetronic disabled, too many adjustment errors”.

I have no loss of power, seems to be at full performance. I’m running a JB4 on map 2, decat, exhaust, intake.

Is it possible that someone has actually disabled the Valvetronic on purpose as you said for greater throttle response OR is this actually an issue I need to get fixed?

[rjahl]

Originally Posted by DBMatt

Unearthing old thread... sorry.

Just to be clear, some people actually run their cars without Valvetronic on purpose??

I ask because I currently have an issue with my N55 M135i Valvetronic (I know this is E90 but I can barely find anything discussing this). I get a CEL and an error code 133E10 which says “valvetronic disabled, too many adjustment errors”.

I have no loss of power, seems to be at full performance. I’m running a JB4 on map 2, decat, exhaust, intake.

Is it possible that someone has actually disabled the Valvetronic on purpose as you said for greater throttle response OR is this actually an issue I need to get fixed?

Get it fixed, you are probably running in a "safe mode" and the system will use the throttle body for load control. I would expect an engine speed and power limit.

[DBMatt]

Originally Posted by rjahl

Get it fixed, you are probably running in a "safe mode" and the system will use the throttle body for load control. I would expect an engine speed and power limit.

Interesting. The car doesn't feel to be lacking any performance at all. Will the JB4 box I'm running affect this in anyway? Perhaps a false code? I can't actually clear the code, it keeps coming back which makes me think it's something real.

I bought the car from a performance car specialist with 15 months warranty so I will get it back to them. I presume they'll have to take it to BMW to fix this though

[bbnks2]

Originally Posted by rjahl

Get it fixed, you are probably running in a "safe mode" and the system will use the throttle body for load control. I would expect an engine speed and power limit.

As stated, there is no power reduction if you manually set the valves to max lift. The DME just defaults to using the throttle plate to modulate airflow. You need to drill a hole through the valve cover though in order to manually adjust the eccentric shaft with an allen key.

[rjahl]

Originally Posted by bbnks2

As stated, there is no power reduction if you manually set the valves to max lift. The DME just defaults to using the throttle plate to modulate airflow. You need to drill a hole through the valve cover though in order to manually adjust the eccentric shaft with an allen key.

With the N52, the system sets rev limit at 6,500 RPM.

[bbnks2]

Originally Posted by rjahl

With the N52, the system sets rev limit at 6,500 RPM.

Ah ok sorry I keep providing bad info for n52 people. Just basing my statements off N55.

Just replace the damn servo motor lol

[Leinho]

Started having issues with the vvl system after vcg replacement. And discovered air leak from VC. New motor and cover are on their way. Car runs like shite, sometimes not firing up. Disconnected ESS sensor and no more Cel, pretty acceptable driveability, rpm fluctuation due to air leak, but overall better than with ess plugged. Vvl motor was whining bad when let of gas and was driving me crazy, and getting very hot also..
Will drive it this way until Parts get here.
Thata my two cents!

[Dsycks]

I'm looking at killing VVL for performance/endurance racing use.

We tend to keep our engines at higher average RPM and I am not sure I want to keep the VVL in there as its simply one more thing to fail.

I know some other race cars that ran this engine did this and I assume they were just locked full open and then tuned around to get best performance.

Anyone else have experience with this?

[Hobbs64]

I know I resurrecting an old thread, but for any of you that were looking at VVL delete (either for racing purposes or for not wanting to repair) I am curious if anyone has run VVL delete for any period of time. If so, what were the effects on performance? Has anyone successfully manged to turn off VVL on MSV80 and run in other than limp mode?

I've built a frankenstein engine.... It is an N54 bottom with a N52 head. I'm ready to assemble and I considering machining out VVL on the N52. Basically, it would become a better flowing N53 head with port injection. It is going to run a GTX 3582R turbo. I don't think I want the headache of VVL. I would like to hear from anyone on the ability to delete VVL, or whether you think deleting is a mistake.

[Nipperjam]

Hi I have a e90 and yesterday started it up the throttle was bouncing from around 700rpm and 1500 rpm and won't Rev past 2000rpm used a snap on reader codes are
2A61 vvt teaching function at stop
2CF8 Dk pot sensor
11527 undocumented code
Parts changed
Throttle body
Parts checked
Vanos solenoids move when connected to power
Vanos plugs 5volt with ignition on
Vvt motor spins when 12 volt is connected also power at plug around 5 volt
Any help would be very appreciated

[hassmaschine]

I'd check your eccentric shaft sensor. The throttle housing and vanos have nothing to do with Valvetronic.

As an aside - I discovered that setting CW_VVTLR (VVT-position controller) to 1 in the DME will "disable" Valvetronic and set it to full lift (and not in limp mode either, like unplugging the eccentric shaft sensor).

I also discovered, while chasing around a 2A39 error (adaptations not saving), that the Valvetronic adaptations are not stored in non-volatile memory. We could not get it to reset no matter what we tried, but by chance that DME was unplugged and another swapped in to test it. When the first one was put back in after being unpowered for a while, *bam*, Valvetronic adaptations were saved, no more 2A39. But at least now my understanding of how it works in the DME is much deeper, lol.

[hujirong]

I am trying to fix the P0022 code in my 07 X5 N62. After swap CPS, vanos solenoid, and valvetronic motor from bank2 to bank1, the same error code stays. So now the only problem I can related to is the damaged teeth in my eccentric shaft. Due to the cost of replacing eccentric shaft, I am looking for a way to disable this too.

In this thread, I am still hearing two opinions:

1. Disconnect the ESS and the car shall run fine. DaanBMW had tried it.
"Test by Pulling the plug on the sensor and turning on the ignition, you should hear the VVL motor running to a stop. Plug in the sensor and check the eccentric cam location via INPA. Should be something like 174.5-180 degrees Unplug the sensor, start the car and go for a drive."

2. Have to manually adjust after disconnect the motor or sensor.

I really want to try the 1st option, because I don't want to spend that money to fix my broken eccentric shaft.

[hujirong]

Originally Posted by rjahl

I'm going to try to clear things up.

Firstly the N52 uses variable Valve lift (VVL or Valvtronic) for load control (throttle). VVL is the variable Valve Timing, (vanos).

The Eccentric cam motor controls the valve lift by rotating the eccentric cam.

The engine can operate at any normal RPM with maximum valve lift 9.7mm,

BMW built a fail safe system into the VVL by adding a program that, when triggered drives the VVL to full lift and then controls the engine load with the throttle, just like a normal engine. In this mode engine RPM is limited to 6,500 RPM

Disconnecting the Eccentric cam sensor will probably trigger the fail safe and the eccentric cam would be driven against the stops The eccentric cam motor would be deactivated by a load limit control and the DME would assume the cam had reached max rotation producing 9.7mm lift.

Test by Pulling the plug on the sensor and turning on the ignition, you should hear the VVL motor running to a stop. Plug in the sensor and check the eccentric cam location via INPA. Should be something like 174.5-180 degrees Unplug the sensor, start the car and go for a drive.

You should be able to hear different sounds made by the intake system. Blip the throttle and you will hear the air rush past the throttle plate as it opens.

This morning I tried to disconnect the ESS sensor, my car couldn't drive, basically entered into the limp mode, plug back in, restarted a couple of times, car back to normal, drives ok, no limit in power etc. 07 X5 4.8i N62 engine, eccentric shaft teeth damaged, P0022 code on, try to get rid of the code.

[hassmaschine]

The N62 is way different from the N52. Different valvetronic system (it's the version 1.1 I think), different control unit, different software..

[woner]

Originally Posted by hassmaschine

I'd check your eccentric shaft sensor. The throttle housing and vanos have nothing to do with Valvetronic.

As an aside - I discovered that setting CW_VVTLR (VVT-position controller) to 1 in the DME will "disable" Valvetronic and set it to full lift (and not in limp mode either, like unplugging the eccentric shaft sensor).

What software do you use to change that setting? ISTA? Also, do you know if disabling Valvetronic with that method would prevent related error codes from coming back?

[evominati]

Originally Posted by hassmaschine

I'd check your eccentric shaft sensor. The throttle housing and vanos have nothing to do with Valvetronic.

As an aside - I discovered that setting CW_VVTLR (VVT-position controller) to 1 in the DME will "disable" Valvetronic and set it to full lift (and not in limp mode either, like unplugging the eccentric shaft sensor).

I also discovered, while chasing around a 2A39 error (adaptations not saving), that the Valvetronic adaptations are not stored in non-volatile memory. We could not get it to reset no matter what we tried, but by chance that DME was unplugged and another swapped in to test it. When the first one was put back in after being unpowered for a while, *bam*, Valvetronic adaptations were saved, no more 2A39. But at least now my understanding of how it works in the DME is much deeper, lol.

NCS coding?

[hassmaschine]

No. CW_VVTLR is a parameter in the calibration. you cannot code it. you have to use a hex editor and flash the DME.

[aureliusmax]

Hey guys, I found this page from google search and thought I would share some of my unique findings that I discovered through brute force experimentation in order to troubleshoot and isolate functions of the engine. Just understand that the particular command in tool32 is not specific with regards to its meaning, rather the result of the function that is desirable.

And, I have been working with a talented ECU tuner after the fact, because I wanted to take my temporary solution permanent so I wouldn't need to lug my laptop and adapters and software just to drive the car without issues. He claimed to 'delete' or disable the VVL system, which rendered the engine impossible to start after the computer tune was run in the simulator.

At the moment, I must run this procedure in order to run my vehicle without any misfires and full power. Since I have previously troubleshooted and repaired all the other causes of uneven rough running. I have mechanical wear in the intermediate levers in the valve lift control system, and the costs of replacing and work to replace it totals the value of otherwise a perfectly good engine and vehicle anywhere else.

This trick will get the engine running in traditional load control mode (throttle body).

I'm trying next to experiment with a method to create a reasonable 'work around' like finding a way to keep the DME online even after the car is shut off. As this is an experiment, I will return later to update.

I did try this on the N62B44 with the older computer version and this trick did not actually work, so I only claim it to work with the N62B48.

Engine, N62B48, 750 E66
using tool32 and open ME9N62.prg
under 'jobs' execute steuern_vvt when engine running. engine will shutoff immediately.
switch off ignition and remove key. count to 20 seconds and restart engine.
once started, misfiring will happen as the engine learns its values.
after one minute, in INPA, clear engine faults and engine will run smooth for the remainder of the engine drive cycle.

explanation:
Executing the command through tool32 will operate on temporary memory of the DME.
It will erase when you shut the car off or what you call the driving cycle.
Valvetronic is now running in a 'shadow' emergency mode which won't power derate and won't show any warning on the dash.
User may adjust the valve lift from INPA option and this function is fully working.

reason:
worn intermediate levers (as per results after run test in ISTA-D). the worn valve levers caused uneven cylinder filling, which caused misfires. when the misfires were detected, fueling was reduced on identified cylinders and power reduced mode continuously until vehicle was rendered un driveable.
there is no more random misfiring during the shadow emergency mode - in this mode, the engine load control is run with the throttle body rather than in normal mode where the engine load control is run with the variable valve lift on the intake valves.

[aureliusmax]

Hey guys, I found this page from google search and thought I would share some of my unique findings that I discovered through brute force experimentation in order to troubleshoot and isolate functions of the engine. Just understand that the particular command in tool32 is not specific with regards to its meaning, rather the result of the function that is desirable.

And, I have been working with a talented ECU tuner after the fact, because I wanted to take my temporary solution permanent so I wouldn't need to lug my laptop and adapters and software just to drive the car without issues. He claimed to 'delete' or disable the VVL system, which rendered the engine impossible to start after the computer tune was run in the simulator.

At the moment, I must run this procedure in order to run my vehicle without any misfires and full power. Since I have previously troubleshooted and repaired all the other causes of uneven rough running. I have mechanical wear in the intermediate levers in the valve lift control system, and the costs of replacing and work to replace it totals the value of otherwise a perfectly good engine and vehicle anywhere else.

This trick will get the engine running in traditional load control mode (throttle body).

I'm trying next to experiment with a method to create a reasonable 'work around' like finding a way to keep the DME online even after the car is shut off. As this is an experiment, I will return later to update.

I did try this on the N62B44 with the older computer version and this trick did not actually work, so I only claim it to work with the N62B48.

Engine, N62B48, 750 E66
using tool32 and open ME9N62.prg
under 'jobs' execute steuern_vvt when engine running. engine will shutoff immediately.
switch off ignition and remove key. count to 20 seconds and restart engine.
once started, misfiring will happen as the engine learns its values.
after one minute, in INPA, clear engine faults and engine will run smooth for the remainder of the engine drive cycle.

explanation:
Executing the command through tool32 will operate on temporary memory of the DME.
It will erase when you shut the car off or what you call the driving cycle.
Valvetronic is now running in a 'shadow' emergency mode which won't power derate and won't show any warning on the dash.
User may adjust the valve lift from INPA option and this function is fully working.

reason:
worn intermediate levers (as per results after run test in ISTA-D). the worn valve levers caused uneven cylinder filling, which caused misfires. when the misfires were detected, fueling was reduced on identified cylinders and power reduced mode continuously until vehicle was rendered un driveable.
there is no more random misfiring during the shadow emergency mode - in this mode, the engine load control is run with the throttle body rather than in normal mode where the engine load control is run with the variable valve lift on the intake valves.

[dcnz]

Originally Posted by rjahl

I ask because you requested help without giving any reason why you wanted to disable the valvetronic. The answer depends on your reasons.

don't reply if you're just going to act like a 5 year old child. He was right. you are full of it!

[rjahl]

Seeing that you are fairly new, I hope your future contributions to this forum provide as much insight and help as your recent criticism's

[k90]

Interesting thread! If eccentric shaft sensor fails DME drives the shaft against end stop and leaves it there?

Have anyone given a thought to "overclocking" N52 valvetronic somehow?
I remember reading that with introduction of N55 valvetronic became faster compared to N52.
Could DME adapt to faster actuation if there was a solution to make the servo motor faster?