vanos oil gate

= vanos solenoid

labored ex cam sensor

= tired and old cam sensor.

the 2nd time there was oil pressure in the exhaust vanos.

How do you know this? If the EX vanos solenoid is jammed, then of cause there is no oil pressure to move the EX piston and so the error code popped up. Also, how did you verify the vanos timing?

 

= vanos solenoid
-> I haven't tried swapping the solenoid between in and ex, maybe tomorrow I'll try to change it.

= tired and old cam sensor.
-> I once borrowed my friend's ex cam sensor that uses an e39 and the result is still the same "vanos exhaust side end position not reached"

How do you know this? If the EX vanos solenoid is jammed, then of cause there is no oil pressure to move the EX piston and so the error code popped up. Also, how did you verify the vanos timing?

-> when I first experienced this error I tried to disassemble my vanos. and when it was disassemble there was no oil in my exhaust vanos. After me and my mechanic check in my ex solenoid, it turned out that the "Gate Engine Variable Valve Timing (VVT) Oil Control" was sticky, so we finally tried to poke it out with a screwdriver and it returned to the correct position. finally we cleaned the oil gate and he was able to move freely.

about the vanos timing I can't be sure by myself but the repair shop that often works on my car they often repair the cylinderhead on the M54 engine they also use the timing tool which is commonly used by BMW specialist workshops.

sorry i'm still a newbie..

any idea what i should check?

 

If the exhaust solenoid stuck once it probably stuck again. Swap known good one or replace it.

Sent from my SM-G970U using Tapatalk

 

Swap exhaust and inlet VANOS solenoids and see if fault follows. If it does then replace the faulty solenoid.

 

thanks guys,
i ll update these thread after i change my oil and swaping solenoid.
fyi my car on 149.000km at these time. my car works normally but the problem is only when I scan found this error. when I've done vanos work there is indeed a lowend torque difference and the rpm feels more responsive. but I'm not satisfied if I haven't solved this problem.

 

The exhaust VANOS piston chamber has a spring in it.

• What would happen if the spring was installed in the inlet side by mistake on assembly?
• Could the spring be installed on the wrong side of the exhaust VANOS piston?

 

I believe on the EX piston has the spring installed to force the piston rearward to advance the EX cam during shut off engine and prepare for the next starting cycle. Even if the spring was install wrong and forcing the piston forward (retarded position), a working solenoid should still supply oil into the piston chamber.

 

I haven't had time to disassemble the vanos yet.


Yesterday I tried to check using INPA

when I checked the VANOS section and then I stepped on the gas pedal of my car until the rpm4000 value did not change. I've never see of live data in INPA for vanos that works normally. is vanos work only at underload?

do i have to check the power supply on my vanos solenoid?

Is it because there is an error "vanos exhaust side end position not reached" so DME does not activate vanos?

 

Yes, you can do VANOS testing with a stationary car. Load is a big factor in the VANOS values, so you will get the largest changes in VANOS when driving.

Below are a couple of charts from testing I've done years back.

• Testing done with a hot engine and stationary car. Just pushed the accelerator down and recorded the values every 500 rpm
• LG73383 is a M52TUB20 with MS42 DME
• LL33005 is a M54B30 with MS43 DME

 

Thanks, this is valuable information.

May I know what application are you using to log this data?

Previously I tested when it was stationary. I rev my car up to 4000 but no value has changed either the target position or the actual position. maybe I'll try while driving.

 

It was manually logged.

• Stationary car
• INPA running on the VANOS page
• Pen and paper in hand
• Hold accelerator at desired RPM and write down the values.

Yes it's a bit rough and ready, but it works.

If you want to do it with a logger, check out TestO. It runs on the same platform as INPA. Diagnostic program with realtime graph view

 

@Sapote Very Good questions.

When I did this testing I knew very little about VANOS and how it worked. So, just recorded all data on the INPA VANOS page. I was trying to see if the VANOS seals needed to be replaced.

My M52TU reference has this picture on page 29. A is Exhaust (Auspuff is German for Exhaust) and E is Inlet (Einlass is German for inlet). KW degrees is cam shaft degrees (Nockenwelle is German for cam shaft).

I understand that the Reference value in INPA is the same as the "UT" line in the picture.

My M52TU test results fit into the range of the above picture.

VANOS target values are set by way of some very complicate tables in the DME. RPM and Load have a very big influence on the target value. So, a lightly loaded stationary engine being rev'ed from idle up to 3,500 rpm does not have a very big VANOS target movement.

If you set up TestO and do some logging while out on the open road, with a couple of hard accelerations, then you'll see the VANOS target numbers changing significantly.

My M52TU reference is attached.

 

guys , i found the problem

my exhaust cam sensor is giving the wrong signal. when i replaced it with the original cam sensor from the bmw varibale the value of my VANOS changed both the intake cam and the exhaust cam.


I disassembled my vanos earlier, and the exhaust piston solenoid may have jammed again because when I removed the exhaust there was no oil in the vanos cam piston. Now I'm swapping the ex and in solenoids along with the solenoid pistons. finally the vanos in and ex ku variables in inpa give the correct value.

I will update the results again.

 

Fyi, Previously I used a Febi sensor cam

 

my vanos work great now, i think my issue is solved.

resolution :
1. make sure your sensor work, dont buy cheap sensor. rather buy second hand oem or original BMW sensor from junk yard if you dont have enough $$$
2. if you sensor OK, check your timing.
3. if still get these error, try to swap solenoid and piston both intake and EX, check your solenid first. some times exhaust piston got stuck because of dirty oil.
4. do vanos job, make sure use fresh oil after that.