MK4 VR6 MAF sensor + Audi A8 MAF housing ???

[CorvetteKillerVr6]

Im Running the Unitronic 440cc file but ive been using a custom made maf housing, very much like the 95mm I.D housing sold by C2 motorsports.

HOWEVER, the car kind of still runs like ****

Unitronic recommends i be using an Audi A8 housing with my mk4 VR MAF sensor in it.

so here's the deal

im sick of these refurbished MAF sensors pouching, so where is the best place to buy a real OEM BRAND NEW one.???
i see ECS tuning has lots of them, but which one is best??

And Also, where can i source JUST a A8 housing by itself with out the sensor???(ill be trying The Source Vw in T.o tomrrow to see if they have anything)

any help would be great

[CorvetteKillerVr6]

anyone??

what is it with these MAF sensors dying so often??

yet nothing seems to really be wrong with it.....

[TBT-Syncro]

what makes you think the sensors are dying?

[lucas13dourado]

the dealer?

[JVK]

Quote, originally posted by CorvetteKillerVr6 »

Im Running the Unitronic 440cc file but ive been using a custom made maf housing, very much like the 95mm I.D housing sold by C2 motorsports. HOWEVER, the car kind of still runs like **** Unitronic recommends i be using an Audi A8 housing with my mk4 VR MAF sensor in it. so here's the deal im sick of these refurbished MAF sensors pouching, so where is the best place to buy a real OEM BRAND NEW one.??? i see ECS tuning has lots of them, but which one is best?? And Also, where can i source JUST a A8 housing by itself with out the sensor???(ill be trying The Source Vw in T.o tomrrow to see if they have anything) any help would be great

Could you send me a picture of the wiring plug for your maf sensor? Then i will be able to support you with the original VW/Audi spare part number. The price is very low on a brand new one. But there a two different type's (on old type, same maf like a Mk3 VR6 / or new type like a VW Golf 4 1.8T 2000<)

You are also welcome to e-mail me with the picture jacob@jvk-tuning.dk

Best regards from
Jacob

[CorvetteKillerVr6]

no,the EPC lights telling me the MAF readings are too low.

and all this is after replacing it and it worked for over 3 months.

now im getting TPS and other throttle body codes, and the car wont even idle.

BUT if i unplug the MAF, car idles and runs fine. AND the T/B codes go away!!!

WTF??

except it runs lean cause its in Limp mode

[TBT-Syncro]

Quote, originally posted by CorvetteKillerVr6 »

no,the EPC lights telling me the MAF readings are too low. and all this is after replacing it and it worked for over 3 months. now im getting TPS and other throttle body codes, and the car wont even idle. BUT if i unplug the MAF, car idles and runs fine. AND the T/B codes go away!!! WTF?? except it runs lean cause its in Limp mode

i suspect that your ecu voltage is too low, and the maf is fine.

[CorvetteKillerVr6]

that could be.

i have the battery relocated to my trunk.
but i seem to be getting a constant 14v most of the time.

so i havent paid much attention to voltage supply possibly being an issue.

im running a 95mm C2 style MAF housing with the Unitronic 440 file, BUT Unitronic tunes there file with the Audi A8 housing.

so im still hunting for this Audi housing to see if that helps.

for the record, the car has been running seemy ok for the past 3 months of summer on the Juan made 95mm MAF housing.

but its had the odd putting and misfire caused by the housing being a little bigger.
but it ran ok.

[CorvetteKillerVr6]

and yes, i can supply and picture of the end.

but im already sure that i MUST use the Stock VR6 MAF sensor in the stock audi A8 housing.

i just dont want to buy the whole MAF sensor/housing setup when I only need the A8 housing

[JVK]

Quote, originally posted by CorvetteKillerVr6 »

and yes, i can supply and picture of the end. but im already sure that i MUST use the Stock VR6 MAF sensor in the stock audi A8 housing. i just dont want to buy the whole MAF sensor/housing setup when I only need the A8 housing

Hi again:-)

Is it this type of sensor you use?

[CorvetteKillerVr6]

no its not that one.
thats from the MK3 vr

i have the newer mk4 style/

this is the MAF sensor im running in a homebrew housing just like the C2 motorsports style

[CorvetteKillerVr6]

like this one

http://www.mjmautohaus.com/cat...d=891

[CorvetteKillerVr6]

and its a 5 pin harness connector

[JVK]

Quote, originally posted by CorvetteKillerVr6 »

like this one http://www.mjmautohaus.com/cat...d=891

Okay you will get instant message on part number right away

[CorvetteKillerVr6]

the part # for which part?

i know i need the a8 housing for sure. but i think my MAF sensor might still be ok, i just bought it like 2000kms ago

but are you saying i could have a faulty harness connector that i should replace???

[JVK]

Quote, originally posted by CorvetteKillerVr6 »

the part # for which part? i know i need the a8 housing for sure. but i think my MAF sensor might still be ok, i just bought it like 2000kms ago but are you saying i could have a faulty harness connector that i should replace???

For a couple of month ago all maf sensor prices made a drop from VW here in Denmark. I think it is the same in the US.

It would be more cheap for you to buy a complete A8 housing with sensor, instead of buying a used housing without sensor.

I cant say anything about the fault, sounds quite strange

But i have used this A8 maf on a lot of turbocharged VR6, 24V and R32 works perfect

[CorvetteKillerVr6]

so thanks to JVK, ive realised that a stock Audi A8 Sensor is the same one as a stock mk4 vr sensor, but the housing on the audi V8 maf is bigger.

so
i will be ordering the entire new stock A8 MAF to see if that cures everything and hopefully gets this cat running properly on 20lbs

so with that figured out, my last question is why was i getting all sorts of throttle body angle sensor codes?? and a throttle position sensor code as well.

but once i unplug the maf it goes away....

is it cause unplugging the maf puts the car into limp mode? which might also make it ignore the angle sensors in the T/B?? or could it somehow actualy be related to the MAF being bad?

[CorvetteKillerVr6]

Awesome JVK, youve helped alot.

im ordering one right now and we'll see if that helps

thanx man!

[JVK]

Quote, originally posted by CorvetteKillerVr6 »

Awesome JVK, youve helped alot. im ordering one right now and we'll see if that helps thanx man!

You are Welcome

I hope it will fix your problem

Best regards from
Jacob

[CorvetteKillerVr6]

JVK, i just installed the new sensor, AND housing and the EPC light did go away,and it did seem to make the throttle feel alot better, but it kept stalling.

BUT i do remember Unitronic trying to adjust some settings in the ECU for the MAF housing i had.

so maybe i need to find out what he changed in VAG-COM and change it back.

if he changed the MAF calculation by just a bit to conpensate for the bigger maf housing i had, would it make it stall now that ive installed the A8 housing and sensor they originaly call for for the 440cc tune???

[CorvetteKillerVr6]

and for the record, i am using the A8 SENSOR and the HOUSING.

[TBT-Syncro]

spend the $200, buy a wideband setup, and figuring all of this out will be simple.

[CorvetteKillerVr6]

im running the innovate lc-1 wideband.

the MAF causing the ECU to freak out i think is the issue

[TBT-Syncro]

Quote, originally posted by CorvetteKillerVr6 »

im running the innovate lc-1 wideband. the MAF causing the ECU to freak out i think is the issue

whats your MAF reading at idle?
whats your 02 reading at idle?
whats your air/fuel at idle?
whats your timing at idle?
whats your TPS at idle?

[CorvetteKillerVr6]

ok,i will check all of these with vagcom tomorrow.
thanx man

[CorvetteKillerVr6]

Im pretty new to Vagcom, i know group 060 is maf..

anyone help me out finding which blocks in Vagcom are for the MAF,the TPS, the O2, and timing????

so i can finally figure this out.

[FaelinGL]

Short and long term trims (add / multi) are block 032.

I'm surprised your car runs with the MAF unplugged. Soon as I unplug mine, the car dies. It may be the C2 software is very sensitive to MAF problems.

Mike

[IHookItUuup]

I don't think he is running C2 fueling - maybe he should!? In VAG-COM as you click on the different measuring blocks text will pop up that tell you what feature you are measuring - just click until you find the feature you would like to measure ie. MAF, Coolant, Timing etc. Hope this helps.

[CorvetteKillerVr6]

awesome man, yeah i finally just realised that if u hold the mouse the paerticular block it says what it is....
haha

i am running Unitronic 440cc tune .

[CorvetteKillerVr6]

what do i do about the idle issue??
it doesnt want to stay running.

how do i adjust the low idle?

[FaelinGL]

Quote, originally posted by CorvetteKillerVr6 »

what do i do about the idle issue?? it doesnt want to stay running. how do i adjust the low idle?

You will be able to adjust the idle using Vag-Com to a certain point. I wanted my idle higher, so I needed to use Lemmiwinks.

Mike

[IHookItUuup]

FaelinGL is correct. Download Lemmiwinks if you want to want to adjust idle speed and startup enrichment. GL and keep us posted so that we know what works.

[TBT-Syncro]

Quote, originally posted by IHookItUuup »

FaelinGL is correct. Download Lemmiwinks if you want to want to adjust idle speed and startup enrichment. GL and keep us posted so that we know what works.

you can raise/lower the idle with vag-com. not sure about on the mk4, but on the mk3 its > adpatation >channel 01, (128 is default value).

[FaelinGL]

Quote, originally posted by TBT-Syncro »

you can raise/lower the idle with vag-com. not sure about on the mk4, but on the mk3 its > adpatation >channel 01, (128 is default value).

This is correct, but I've found with the C2 software, I can only get channel 1 up to about 132 (which I think is like 650 rpm). I need mine around 750-800 to get rid of the vibrations from the VF Mounts, so I had to use Lemmiwinks. It may be different for your software however.

Mike

[TBT-Syncro]

Quote, originally posted by FaelinGL »

This is correct, but I've found with the C2 software, I can only get channel 1 up to about 132 (which I think is like 650 rpm). I need mine around 750-800 to get rid of the vibrations from the VF Mounts, so I had to use Lemmiwinks. It may be different for your software however. Mike

thats strange. with the mk3 software, each unit is equal to 8rpm. So on a mk3, having it set to 132 would mean an idle speed of 1050.