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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-20-2013, 07:36 AM   #1
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Join Date: Feb 2013
Location: Portugal
Posts: 32
My Ride: BMW 318i E46
Question INPA Values and DISA Rattle - Need Opinion


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!


Last edited by hughfr4nc15; 02-20-2013 at 09:31 AM.
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Old 02-25-2013, 01:45 PM   #2
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Join Date: Sep 2005
Location: france
Posts: 296
My Ride: bmw e46 CI
Yes i have the same error and motor sound
changed my maf for error 171 and now no error

for the "sound" change your disa , i have changed mine too because ii had the same sound , After that all sound nice

Last edited by dvd64; 02-25-2013 at 01:49 PM.
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Old 02-25-2013, 03:59 PM   #3
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Thanks for you feedback, will replace it ASAP.

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Old 03-11-2013, 05:24 AM   #4
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Location: Portugal
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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. Car seems a bit hesitant sometimes when driving.

Last edited by hughfr4nc15; 03-11-2013 at 05:25 AM.
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Old 03-25-2013, 10:51 AM   #5
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If your valve cover shows signs of recent past oil leak check your spark plugs

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