Vacuum Leak | PCV | Smoke Test | 2.0 TSI | P0171 | VW

[@mazpr2025]

I have done the rear main seal, incredibly intensive for one small piece. I would start planning replacing the DSG clutch flywheel (if auto), and anything along the way like water pump, any coolant hoses, carbon clean the valves injectors, HPFP lobe bearing, oil cooler seals etc. I bought mine from an owner similar to your situation, he got fed up with the repairs. It had a Christmas tree of CEL codes, took me about six months and around 4k if I add what was broken and what was about to be broken, and that was me doing all the labor work.

[@pkey7370]

your pcv valve blew your rear main seal. If the PCV valve is faulty it builds pressure and VW uses a cheap crappy seal that almost ALWAYS blows out. With VW Preventative maintenance should be checking PCV valve often and replacing it often to avoid ever having that issue.

[@ajrveedub]

Real main seal is gear box off job my man. May as well upgrade gearbox parts or refresh them along the way.

[@javienj.2535]

how many miles does your gti have?

[@maxc1913]

I have the same problem right now. Rough idle and misfire on cylinder 2 even after changing my pcv 🥲🥲

[@hanksun8707]

If it’s consistently 2 then I would check the coils and spark plugs of 2

[@maxc1913]

@@hanksun8707 I changed my coils and sparks and same thing. I also changed my coil connector and still with the misfire on cyclinder 2 😢. Any ideas?

[@aliennemesis0663]

​@@maxc1913did u ever fix the problem

[@aliennemesis0663]

​@@maxc1913 im having same problem with my mk6 gti. Change coils and plugs and still having a cylinder 4 misfire

[@controlCcontrolVmedia]

same here .. i beleive that the smoke test is mandatory at this stage@@maxc1913

[@controlCcontrolVmedia]

why did u stop posting!! new subscriber here @hanksun8707