Old magnet, 2 days after cleaning.

 

 

New magnet.

 

 

Thank you @Bingodalton

 

Your old magnet is behaving exactly like my one. Same noise and slow/sticky movement.

New magnet for exhaust camshaft installed and here are new graph vs old graph.

Red is specified, green actual.

I can not feel the difference, so its minor, but still it is visible how well it is working compared to old one.

 

 

 

Awesome work @Bingodalton!

 

Once my part arrives I will fit it and update the thread. I'm hoping this will fix my problem

Fingers crossed.

At least it will be much better.

@Bingodalton I'm curious - Was your exhaust adjuster "Sticky" like your intake one?

I know the replacement hasn't made much of a difference, but I'm curious if these adjusters get sticky ones they're full of warm oil?

On 18/10/2021 at 17:40, Ecomatt said:

If your car is running rich I would check lambda (oxygen) sensor values. If they are reading low then the car will over fuel. My guess is one of the sensor are on the way out.

@EcomattI've got a VCDS cable coming soon. At the risk of sounding like a right n00b could you give me some ideas of what values would indicate an issue?

To confirm: My LTFT is always negative 10 (Or more) so the ECU is pulling fuel due to a rich condition.

 

I know there are two o2 sensors. A pre and a post cat. My understanding is the post cat just tells the ECU how the cat is doing, and shouldn't affect fuelling.

 

So my attention should be on the pre cat o2 sensor (The one near the turbo), right?

Edited 20 November, 20214 yr by the_slug

Exhaust one was sticky too. I will record it also.

It is visible by data on graph and it sounds different too.

Naturally there is no lifetime part.

 

As a matter of O2 sensors, I will jump in.

Lambda should be 1, so it hovers 0.99 - 1.01, that is good value

Sensor after car is around 0.720-0.780v and it is hovering around this value.

If you depress gas pedal, then first one will go up, and second value down. They should react and go back after revving.

If cat is bad, second sensor will fluctuate from 0.2 to 0.7 on idle.

If some of them are faulty, they will not react on revving, be stuck. Or first will react slow.

First one is changing fast on changes, while second one slower, there is cat on the way to take out the oxygen and make things to change slower.

 

Thanks again @Bingodalton!

 

I know your fuel trim was also affected by the adjusters being bad, but was your fuel trim negative (like mine) or positive?

Mine were going on positive side, but somehow not always. It is hard when you are looking for a problem and you see it anywhere, from vacuum leak to fuel trims, sparks, coils,...

If I remember correctly even my air mass on idle idle was not specified, like 30-40% less. Now is spot on.

Variable camshaft was causing this, less air, unburned mixture misfire, then it detects lean misfire and mixture (wideband lambda is ok, but post cat is lean, should somehow correct lambda), hence adding more fuel. 

These engines are made to meet high emission standards and they really strugle at idle if anything is not working perfect (or let say 90%).

 

@Bingodalton

 

I'm still waiting for my adjuster to arrive, but in the mean time I've checked pre-cat O2 readings via VCDS.

 

Do they look right to you?

Can you check the adjuster. Camshaft Adjuster intake and exhaust. What are the readings?

My Lambda has 4 decimal places., broadband probe is there at 1.9xx V, but Lambda actual value goes from 0.9902 to 1.088, strange you have just 1. 

Averaged value is there, depends, from -0.2 to up to 3.0%, I am looking at some video, before I changed magnets.
You can check Oxygen Sensor bank1 sensor 2 (jump voltage).

Hi @Bingodalton

 

Here's the data you asked for:

 

 

Your magnets look ok 😞

At least when you took your photo.

I guess intake one is not fluctuating a lot.

 

Your sensor 2 looks way out. Its value is between 0 and 0.9v, notmally 0.2 to 0.7V.

They say when cat is working and warmed value is around 0.7 to 0.8v, as it is removing oxygen from exhaust gases and indicating rich value.

 

Your log is showing rich value, way too rich.

While lambda is showing that it is good air/fuel ratio.

 

Is it warmed up?

If yes, then you can follow just lambda where it is 4 decimals and Sensor 2, click on graph and look at it.

Both should be still, flat lines, almost.

Depress the gas pedal few times and take a look at the graph.

Check how both sensors behave.

Lambda goes up and down very fast and steep, while Sensor 2 goes down and slowly up to flat line with little fluctuation when you release gas pedal.

But, O2 narrowband sensor should never show above 1V, so it seems it it broken.

Check if value is moving at all.

 

Could be your problem, that it is correcting your fuel trims.

You said they are negative?

 

It even say this sensor is not OK, but maybe it is not warmed up yet.

Edited 23 November, 20214 yr by Bingodalton

The intake magnet "actual" struggles to keep up with the requested, but it does eventually settle around the same number. So I still think it's worth replacing.

 

Yes the car is warmed up.

 

Can you let me know the name of the two sensors I need to graph? There's a lot of them available 😆

Camshaft magnets will always trying to keep with specified value, but as I see i range of +/-1.

 

You need to check values with "broadband sensor" and "jump sensor".

First one if upstream, before cat. Other one is downstream, after cat.

They are different types, so they do not behave same way.

Any news?

Sorry @Bingodalton I was busy with work yesterday.

 

I will provide the data on my lunch today

Great. I am eager to help.

Sounds like ur problem is bad downstream O2 sensor.

I will try to log mine from cold start so you can compare. 

When cold and without cat working its job is should go up and down, but after cat is warmed up it should be steady above 0.5v, below 0.9v.

@Bingodalton Here's the logging from VCDS:

 

 

Here is a video of live graphing and me applying some load to the engine: https://drive.google.com/file/d/1qhTQH_Kc-H5ZnDmyZAtEnuM6uQ2Yej3M/view?usp=sharing

 

What do you think?

Your sensor 2 is not changing voltage at all? 1.275V always?

Can you check Oxygen sensor voltage bank 1 after catalytic converter?

This should be read same as Sensor 2 jump sensor voltage.

 

It should not go above 1V at the first place and it should fluctuate a bit.

 

It is faulty O2 sensor or some wiring problem.

You do not have downpipe without cat?

No, the sensor always stays at the same voltage.

 

>Can you check Oxygen sensor voltage bank 1 after catalytic converter?

 

I don't seem to have that sensor available?

 

Here are readings from just now:

 

I would say that this sensor is not working at all.

On mine, this value is 0.7-0.8V

Edited 25 November, 20214 yr by Bingodalton