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Model specific boards => Golf mk4 => Topic started by: Hali on 13 October 2013, 17:24

Title: Rough idle???
Post by: Hali on 13 October 2013, 17:24

When ever I floor it my car will run rough for a while and when sitting in traffic it starts idling very rough anyone know what it could be? It's aum 1.8t with forge tip and milltek cat back

Title: Re: Rough idle???
Post by: barrym381 on 13 October 2013, 17:38

try cleaning the throttle body an check with vw if your car is due coil packs under the recall  :smiley:

Title: Re: Rough idle???
Post by: Hali on 13 October 2013, 18:26

I've tried VW for recall no luck  :sad: I think I've seen Throttle body cleaner in halfords, it sometimes hesitates and then pulls really fast does that sound like the throttle body?

Title: Re: Rough idle???
Post by: Hali on 13 October 2013, 18:28

Gonna give it the full works soon coil packs plugs oil clean the throttle body, then a trip down to r-tech I think  :grin:

Title: Re: Rough idle???
Post by: dom on 13 October 2013, 18:47

Could also be a split breather pipe

Title: Re: Rough idle???
Post by: brewey on 13 October 2013, 19:13

What diverter valve are you running? Sound like when my OEM one split.

Title: Re: Rough idle???
Post by: Wazzzer on 13 October 2013, 19:52

lambda can also cause this. You need a VAG COM scan to make sure

Title: Re: Rough idle???
Post by: Hali on 13 October 2013, 20:30

Stock dv, when I had the forge tip done they found split pipes under the manifold and changed it

Title: Re: Rough idle???
Post by: brewey on 13 October 2013, 21:35

My guess is split diaphragm in the DV. Either get a forge 007p or 008 or the new revision OEM 710 vag DV

Title: Re: Rough idle???
Post by: Hali on 13 October 2013, 21:37

Was just reading another post about it running rich if the mafs been unplugged and that the cat can get clogged up?