N62 misfire
 

I had some years ago random misfire in various cylinders.
Then I have unplugged right side cam sensor plug and all the issues were gone. Is it a faulty valvetronic or could it be something else?
X5 e53 04 4.4 N62

I'm not aware the car will run without the cam sensor unplugged. Do you mean the valvetronic connector?

The shade tree diagnostic for valvetronic intermediate levers or valve height setting is to unplug the valvetronic if the idle is horrible; unplug the valvetronic and it will idle fine.

The bad idle usually it the minimum valve setting or bad intermediate levers. Look to see if your VIN is included in the intermediate lever recall on the N62

The sensor is located in the back side of the engine and only on one side (passenger side) is disconnected, other one is connected. The current only DTC I have, with the cam sensor unplugged is: Camshaft Position Sensor "A" Circuit High (Bank 1 or single sensor)

The DTC is also referring exactly to the camshaft sensor.

Passenger = right or passenger left? Bank ones is right. At least a third of Co are right hand drive avoid the vague term of passenger/driver. I think that is a USA concoction from too many people could not remember left vs right.

Anyhow; you made a few statements but not really any questions. What are you trying to solve?

You need to have working CPS for your engine to run properly. Do you have software or scan tool that will read requested and actual cam angles? If so plug in the sensor and read the values.

Also, swapping Banks or intake & exhaust is an invaluable diagnostic tool. More than likely you have a bad cps that needed replacing not unplugging


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The question was in the first post: Is it a faulty valvetronic or could it be something else?

I have one tool with the Autocom/Delphi software, but it seems that I am not able to read the cam angle. Or maybe I just do not know how to use the software properly.

What is doing the valvetronic, when the CPS is unplugged? Is it increasing the valvetronic valve lift? I thought that when the CPS is unplugged, then the system will increase the valve lift and this is why it runs fine when the CPS is unplugged?

With the cps unplugged the computer has no idea when to inject fuel, how much to lift the valve how long to hold them open. The engine must have a limp home mode that's engaged so the engine will run, it probably disabled the valvetronic completely I can't imagine how much power is lost.

You need to have the car running with all CPS and root out the actual problem.

As I said first post, swap CPS bank and see if the problem follows

What are the symptoms? Backfire? Very rough idle? Does it clear up when engine is warm?

Also: when did the problem start? Did it happen suddenly or did it start mild and get worse?


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It used to start some years ago only with cold weathers, when engine was cold it had lots of misfire and engine light and so on. When warmed up then it started to run fine.

After some time it got worse, so it had misfire error also when engine and weather was warm. So basically it did start mild and got worse.

Regarding the power loss I can't comment, did not notice by butt feeling no loss.

I think you might need to take the X in to a good indy mechanic and have them look at it. If you have had problems for years I'm not sure you have the ability to tackle it.

No offense intended, just an observation. I was having the same issues Andrew is following the posts for symptoms or clues as to what is going on. Swapping cam sensors (if same part number) is a great way to diagnose a bad cam sensor as a start. But you are going to need to read out cam angles, voltages, and other real time data to diagnose this particular issue. How many miles on the X5 currently? How many when problems started?

Shoot, I seem to recall problems with the electrical box on the right side of the engine bay causing issues for some (IVC? IVS? I forget the acronym). That sound familiar Andrew?

When I estimate, then the problems have started with the mileage around 270000 and now it is somewhere around 290000.

To be honest I have not dealed with the issue for a long time at all since when I disconnected the CPS then the X drives without an issues. But I would like to start working with the issue now more deeply.

@ CW, good call.

IVM aka "Integrated Supply Module"

It cracks me up how they keep the German abbreviation but translate the part name to English. My favorite is Drive Away Protection is of course EWS.

https://uploads.tapatalk-cdn.com/202...d91830eac1.jpg


BMW 12-52-7-510-638 Integrated Supply Module https://www.amazon.com/dp/B00NQFCUEA..._RtQvEb1WMQJVW

That part can cause symptoms like described it regulates the voltage for most of the brain boxes of the car.