Gti 2.0 8v emisson's

[Chief ka kar]

Can anyone help me my gf's gti 8v as failed its emisson's.
I had a code reader on it and it came up with the lambda sensor with did reduce a bit but still wont pass.
The exhaust as been checked for leaks and all ok , but it as got the guy in the garage puzzled.
When running the car stutter's when driving.
As anyone got any idea's what the problem may be ??

[AlanD]

Did you actually replace the lambda sensor? The bit you wrote after that doesnt really make sense 

[Chief ka kar]

Sorry your write, i was rushing a bit
Yeah i had a new one put in which did reduce it, i think to pass on lambda it has to be 1.30 mine at first was 1.76 but it's now down to 1.50.

[Len]

If engine running rough on tickover then check all breather pipes! Thats what my problem was!

Thats oil breathers and vacuum hoses.

[Chief ka kar]

The bloke in the garage, did by pass an oil pipe because it looked week but made no differance and he checked the vac pipe's
He was telling me he think's it maybe an air leak somewhere.
I just thought someone may have an idea before it cost's me a load of money at a garage.

[gtigolfthree]

Tends to run rich if the maf is faulty.

[robz]

have ya checked the oil breather rubber bung - cant remember the real name, lol,
see if that has split
(the one under the black breather box on the cam cover)
mine had split and ran like a dog!!
worth a though
otherwise i agree with above vac pipes etc...

[Chief ka kar]

Just to update i had a bit of a play around to see if i could find a split pipe.
No joy but i unplugged my maf sensor and the car did'nt stall, i thought thats funny the car should stall.
I took it for a test drive and she run's sweet as a nut
In tomoz to see if the emisson's is sorted.
Somebody work that out.

[andc1]

i had this when i had my scooby, take it for a run and thrash the sh.t out of it, get it nice and hot and put it back thro,
i no its not a subaru but you will be surprised how much crap that will burn out, all scooby owners do this and it does bring the emissons down a bit, sometimes enough to pass

[Chief ka kar]

Yeah i will do that, its just before i could'nt because it was holding back too much and i was scared of poping something, but now that i have removed the maf plug it runs sweet.

I dont understand how it can run with that not plugged in, unless somebody came up with a great idea and has by passed the flow meter