MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: benje on November 25, 2009, 06:07:05 pm

Title: erattic idle, what is a pcv and where is it?
Post by: benje on November 25, 2009, 06:07:05 pm

hi, mate has a audi a3 2.0 t that is eratic with tickover on idle but fine after, people say a pvc is a common fault but what is it and where is it on the car to block off and see if it makes a difference,

Title: Re: erattic idle, what is a pcv and where is it?
Post by: KRL on November 25, 2009, 07:29:29 pm

Hi,

All the info you need will already have been posted.  Try searching, here would be a good place to start:
http://www.mk5golfgti.co.uk/forum/index.php?topic=8565.0
 :happy2:

Title: Re: erattic idle, what is a pcv and where is it?
Post by: jonnyc on November 25, 2009, 07:31:03 pm

Quote from: benje on November 25, 2009, 06:07:05 pm

hi, mate has a audi a3 2.0 t that is eratic with tickover on idle but fine after, people say a pvc is a common fault but what is it and where is it on the car to block off and see if it makes a difference,

A quick test is to have the car running.. Disconnect the front hose from the PCV that connects to the inlet manifold, and then block off the inlet manifold bung with your hand, if the idle settles then you know its a faulty PCV..

Title: Re: erattic idle, what is a pcv and where is it?
Post by: benje on November 25, 2009, 07:46:31 pm

so in the picture what colour line do i disconnect?

Title: Re: erattic idle, what is a pcv and where is it?
Post by: jonnyc on November 25, 2009, 07:52:13 pm

Quote from: benje on November 25, 2009, 07:46:31 pm

so in the picture what colour line do i disconnect?

The hose with the green and red arrow on either side.. Disconnect that and then block off the inlet manifold (big plastic piece fixed to the front of the engine) with your hand..

Title: Re: erattic idle, what is a pcv and where is it?
Post by: benje on November 25, 2009, 07:59:32 pm

thanks will try, what does pcv stand for by the way?

Title: Re: erattic idle, what is a pcv and where is it?
Post by: jonnyc on November 25, 2009, 08:00:26 pm

Quote from: benje on November 25, 2009, 07:59:32 pm

thanks will try, what does pcv stand for by the way?

Positive crankcase ventilation.. I think..

Title: Re: erattic idle, what is a pcv and where is it?
Post by: KRL on November 25, 2009, 08:00:45 pm

Positive Crank Ventilation

Title: Re: erattic idle, what is a pcv and where is it?
Post by: KRL on November 25, 2009, 08:01:05 pm

You beat me  :laugh:

Title: Re: erattic idle, what is a pcv and where is it?
Post by: Tfsi_Mike on November 25, 2009, 08:11:44 pm

Anyone on here experience better running / boost pressure / idle after installing the Forge or BSH PCV fix?

The 'rents have agreed to get me it for christmas  :pomppomp:

Title: Re: erattic idle, what is a pcv and where is it?
Post by: KRL on November 25, 2009, 08:22:19 pm

I've not noticed any difference.  I think you will probably only notice a difference if your PCV was already on its way out.

Title: Re: erattic idle, what is a pcv and where is it?
Post by: Janner_Sy on November 26, 2009, 08:13:32 am

Quote from: Tfsi_Mike on November 25, 2009, 08:11:44 pm

Anyone on here experience better running / boost pressure / idle after installing the Forge or BSH PCV fix?

The 'rents have agreed to get me it for christmas  :pomppomp:

i noticed better fuel economy by about 2bhp, but i think my PCV was broke before i fitted it. plus you should see the amount of crap that comes out of it. I empty fortnightly and loads of stuff comes out

Title: Re: erattic idle, what is a pcv and where is it?
Post by: Tfsi_Mike on November 26, 2009, 08:18:12 am

Quote from: simonskerton on November 26, 2009, 08:13:32 am

Quote from: Tfsi_Mike on November 25, 2009, 08:11:44 pm

Anyone on here experience better running / boost pressure / idle after installing the Forge or BSH PCV fix?

The 'rents have agreed to get me it for christmas  :pomppomp:

i noticed better fuel economy by about 2bhp, but i think my PCV was broke before i fitted it. plus you should see the amount of crap that comes out of it. I empty fortnightly and loads of stuff comes out

How often you have to top back up now?

Title: Re: erattic idle, what is a pcv and where is it?
Post by: KRL on November 26, 2009, 01:18:12 pm

I've had my catch can installed for about 2k miles now.  I empty it weekly and am getting about 3 floz per 350 miles out of it.

Oil top up wise its looking fine, not had to top up at all yet.