Failed vanos test

[M3kob]

Hi all

Car hasn’t been used for a while and just got the smg all sorted and now noticed it not being smooth when revving through the range. No fault codes stored but ran a vanos test which failed for Inlet side (as pictured)

Any help would be appreciated

[paulclaude]

Looks like you have no movement on the camshaft and is sitting at full retarded position. Most likely culprits would be the solenoid pack or a wiring/connector issue

[M3kob]

Looks like you have no movement on the camshaft and is sitting at full retarded position. Most likely culprits would be the solenoid pack or a wiring/connector issue

Thanks. I have swapped solenoid pack from a used car and still getting the same

[Slideways]

Thanks. I have swapped solenoid pack from a used car and still getting the same

Next thing to try is cleaning out the valve block above the pack using Beisan's method.

[M3kob]

Next thing to try is cleaning out the valve block above the pack using Beisan's method.

I cleaned out valve block as I had a spare one and no fitted this and no changes. Didn’t have new seals though. I’ve got a new accumulator and oil line on the way to see if that helps

[Slideways]

I cleaned out valve block as I had a spare one and no fitted this and no changes. Didn’t have new seals though. I’ve got a new accumulator and oil line on the way to see if that helps

Did the VANOS test stop on the intake side or did it also test the exhaust side?

I'm not sure how you are not getting fault codes for this.

[M3kob]

Did the VANOS test stop on the intake side or did it also test the exhaust side?

I'm not sure how you are not getting fault codes for this.

stopped at the intake side and didn’t even get to exhaust.

im also suprised at this, makes it harder to diagnose and hoping someone knew more

[oceansize]

Log while driving.

[M3kob]

Log while driving.

Hopefully can get it out tomorrow and record values while driving

[sapote]

Hi all

Car hasn’t been used for a while and just got the smg all sorted and now noticed it not being smooth when revving through the range. No fault codes stored but ran a vanos test which failed for Inlet side (as pictured)

Any help would be appreciated

New Accumulator won't help in this case.

The absolute value for max retarded IN is 130*, and max advanced is 70* , and so the displayed 60* is a relative value for max retard, and 0 for max advance.

You can try to manually turn the cam to max advance and see how the displayed value changes. You can unplug the vanos solenoid to see if the codes pop up.

[M3kob]

I am waiting for new braided vanos hose and thought I might as well change for a recharged unit at the same time as it’s cheap enough.

guess I’ll need to whip of rocker cover when the weather is better to try and move cams and inspect

[M3kob]

Managed to get ista from someone working on it. Carried out vanos test with same result. There was an option to test solenoids which we did and could hear each one clicking

[BL92]

You may have a broken tab on the exhaust hub

If not

Try changing your oil, reset adaptions via inpa and go for a drive around the block and retest

[M3kob]

You may have a broken tab on the exhaust hub

If not

Try changing your oil, reset adaptions via inpa and go for a drive around the block and retest

I did think about exhaust hub, thinking about rebuilding vanos as it’s never been done and car is 23 yrs old now. If exhaust tab is broken, I’ll have to replace this as well

[sapote]

You may have a broken tab on the exhaust hub

what's so special of having a broken tab vs 2 broken tabs? Vanos should continue to work with one broken tab as it still drives the pump disk.

OP, you might want to check the pump pressure.