Menriksson

So I was accelerating in second gear and the car stuttered for a second and the ABS/PSM light illuminated. Car still ran fine but i did noticed a bit of hesitation under very low load. Scanned for codes and the ECU threw the good old p0102 code. I ordered a new one from ebay, though not entirely new but the seller claimed it was working. Received it today and i switched the old one for the one I just bought and erased the fault codes. All good, the ABS/PSM was working again, car was idling fine and was running very smooth under low load. However, when hitting the throttle and as the boost started to build the car ran terrible, stuttering a lot. I checked the ECU for codes again but none was registered.

My question is.. If the new MAF was faulty, shouldn't I get a code for this? Any thoughts?

pancing

Turn off your ac and see if a cel appears
If you get one take your airbox off and check and see if the honeycomb air straightener has become dislodged. Or you can shake your airbox and see id its rattling around. I had your exact same problem
Went through 4 different mafs to realize the honeycomb was dislodged.

Menriksson

Thank you, I will try tomorrow. However, it does seem quite related to the MAF since the car runs VERY differently depending on which one of the two MAF sensors I mounted.

pancing

The air straightener is directly related to the maf.
The boxter maf needs a different update to work correctly in our cars. The 996tt works correctly.

Did you order a bosch maf or an aftermarket?

Try and see if its the air straightener then check the part number on your maf.

Menriksson

The part number is identical to the old MAF. The new one is a used MAF so not sure if its OEM or aftermarket, the bosch number is correct thought.

When running the old MAF that throws the P0102 code i get 1.0bar on full throttle and the car runs just fine except for some small stuttering on very low load. If it was to be a boost leak or something like that i reckon the car wouldn't run to good under boost right?

pancing

I get stuttering at partial throttle when cold ONLY.
It could be that you have a fueling issue or a maf issue or something else. If youre having problems dont get into boost. Why did you get a used maf? New mafs are under 200$. Make sure the maf is a bosch maf.

pancing

https://www.rmeuropean.com/Products/...FG14-V908.aspx

This the mass airflow i have.

And i guess they went up since i bought one but still when it comes to sensors always buy oem new.

Menriksson

I got a hold of this MAF from a nearby source, cost me $30 so hard not to give it a try. Although I will look for a new one!

Thanks for the tip!

wross996tt

What honeycomb air straightener? There is no such part in the stock configuration (see PET)

pancing

Thats the gt3 box

Theres a straightener in the turbo box
Its directly before the maf.
Did you open up your air cleaner?
Do you have a stock paper filter?

wross996tt

No it is not the GT3 box. The part number is 996...Doh! There is NO straightener. Or else let me know the part number. If you have one it is after market. I know EVOMs makes a straightener for their V-flow.

nelsontod

Kevin

The 996TT has two components. A waffle air straightener disk (round black plastic) and directly behind that a mesh screen (similar to a fine window screen mesh)

Carlo_Carrera

The straightener is built into the airbox. It is not a separate part, thus no separate part number.

pancing

watch that video @ 4:58 mark, I don't feel like taking apart my airbox right now to show you but it is there.
I do not think there is a part number associated with it, it comes with the whole assembly.

https://www.ecstuning.com/b-genuine-...r/99611002170/
3rd picture depicts the mesh.

also have you taken it apart yet and found that it isn't there?
or are you going by exploded diagrams?