INPA Values and DISA Rattle - Need Opinion

Hello,

I bought an E46 318i (M43) a couple of months ago. Although it was/is in a very good condition, I'm a meticulous guy so I've done some maintenance on it:

- Fuel Filter
- Oil Filter
- Polen Filter
- Air Filter
- Engine Oil
- Gearbox Oil
- Differential Oil
- V-Belts and Pulleys
- Oil Filter Cover O-Ring and Gasket
- Spark Plugs

At the moment there are two things that are bugging me the most, first some INPA Values that I would like some opinions:

1 - Load Value: What causes this, from what i've read maybe MAF?
2 - Ignition Angle Degree: Any thoughts?
3 - Pulse duty factor: ICV? MAF?
4 - Lambda Sensor Voltage Before KAT: This oscillates quite a bit @ idle, defective?
5 - Rough Values: Cylinder 4 used to be near or higher than max value, then I replaced all the spark plugs and it lowered. What do you think of this values? Why is Cylinder 3 always around 0?

Error 171 is also showing up on INPA.

Second, I hear some rattling when I'm driving mostly around 2500 rpm. I believe it might be the DISA. Below is a recording I've made with my phone placed near it, what's your opinion? From what I've seen in other videos it seems like it needs to be replaced...

Thanks in advance!

__________________

Originally Posted by hughfr4nc15

1 - Load Value: What causes this, from what i've read maybe MAF?
2 - Ignition Angle Degree: Any thoughts?
3 - Pulse duty factor: ICV? MAF?
4 - Lambda Sensor Voltage Before KAT: This oscillates quite a bit @ idle, defective?
5 - Rough Values: Cylinder 4 used to be near or higher than max value, then I replaced all the spark plugs and it lowered. What do you think of this values? Why is Cylinder 3 always around 0?

Error 171 is also showing up on INPA.

Second, I hear some rattling when I'm driving mostly around 2500 rpm. I believe it might be the DISA. Below is a recording I've made with my phone placed near it, what's your opinion? From what I've seen in other videos it seems like it needs to be replaced...

Thanks in advance!

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Errm... It might be me but I can only see you quoting me..!?

Weird. I can see it.
Here's a repost:
1. Load value is a calculated percentage of total power that the engine is currently producing. Engine off=0, wide open throttle at peak power RPM = 100.
2. This is the ignition timing from TDC. Obviously, this will change under different driving conditions.
3. I believe this is the duration of fuel injector pulses. Larger duty factor means more fuel is being delivered to the engine.
4. It's perfectly normal for this value to fluctuate in a sine pattern while the engine is running. Frequency of the sine wave increases with RPM. If the post cat sensor is fluctuating, then you have a problem. This one should remain constant for any given engine load/speed.
5. This is an indication of quality of spark delivered by the spark plug. It calculates this by looking at the voltage drop across the low tension side of the ignition coil immediately before and after the spark is delivered. A high value indicates cylinder misfire. It would make sense that the values went down after replacing the plugs. The ideal value for all cylinders is zero.

Does inpa give a description of code 171? Usually it does. That info would be helpful

Not sure about the rattle.

Thanks for yout comment.

The message is in German but I believe it is Check Fuel Supply System. From my "googling" this error is common with the symptoms/values I have in the screens.

1. I'm planning on replacing my DISA and also clean MAF, the throttle body and the ICV, I guess it would help if any of the sensors is gone already.
5. Do you think it might be worth to check the Wires or Coil? Or these are acceptable values? Can I test them without buying new ones?

Chances are that the coils and wires are not causing the error codes. Cleaning the MAF and replacing the DISA are likely to help. Do that first, clear the code and see what happens. While you're under the hood, check the intake boot between the MAF and throttle body for cracks and tears (very carefully, removing them for inspection, ideally).

Will do.

I'll post the results after.

I've cleaned my ICV, throttle body and MAF and no big difference in INPA values. Idle is a bit more steady though. The boot between the MAF and the throttle body is ok, no cracks.
I plan to replace the DISA ASAP.

I also plan to replace the wires based to try to improve the rough values. IMO the car seems a bit hesitant sometimes when driving.