Just to warn you I might look daft after this admission but I want to check that I am daft and it's not someone else being mistaken.

I've just come into £100 of spare cash and next on my mod list was going to be either the Forge or APR R1 Diverter Valve. Unfortunately as you may have read in my other post my Boost Pressure Control Valve may well be faulty so I stashed my £100 to buy a reconditioned replacement. Having spent the past 2 days looking for somewhere that does recon ones (GSF don't have any) I finally stumbled upon a thread that suggests that the Forge/APR diverters actually replace the Boost Pressure Control Valve.

Is this correct? I would have looked incredibly stupid forking out for a reconditioned Skoda replacement only to fork out again in two months or so for a replacement to replace my replacement!!!

Cheers.

I've now found other posts talking about whether to change the diverter valve or the N249 BPC valve. Looks like I might have been right in the first place?

:confused::confused::confused::confused::confused:

Well, I've never heard of reconditioned BPCVs anyway.

That may be why I found it difficult then!!

I've made a good find anyway. Put the part details into 1stchoice.co.uk who search 250+ scrappies. I got one quote for a Boost Pressure Control Valve - £90 delivered with a 2 month guarantee. An hour later another one quoted me £40 delivered with a 3 month guarantee!! Not as good as a new one but for £40 I cannot really go wrong especially with that guarantee.

And as there was a chance it was the diverter valve that was causing the problem it also enabled me to convince SWMBO to allow me to buy a Forge Diverter Valve!! So that should cure my problem whichever bit it is that's given up.

Unless of course it is the turbo that's knackered! Please God don't let it be the turbo!!

I would replace the DV first and see how you go because you've already had it remapped. Why do you think the Boost Pressure valve is gone? A lot of people, including me with the same car as you, have/had boost problems, limp mode etc. I bought a Forge DV but it still happened. I replaced the N75 valve and it's done the trick. That was about £30 from TT Sport or something like that. Look at that instead maybe?

I'm confused as to what component your talking about! Valves it could be:

-The 'Charge pressure control valve pressure unit' is the wastegate actuator on the turbo.

-The 'Solenoid valve for charge pressure control -N75-' is the electronically activated valve that varies when the wastegate opens (5psi limp, 10psi normal, 15+ psi when mapped etc). (Connected to the wastegate actuator).

-The 'Mechanical divert air valve' is the diverter valve (DV), that opens when there is a vacuum in the inlet manifold.

-The 'Turbocharger divert air valve -N249-' is the electronically activated valve that can open the DV to reduce inlet pressures when the ECU demands.

Whatever component is at fault, I wouldn't bother with a second hand part. A new N249 is about £40, and a Forge DV is £100 (both of which I've replaced). I've not heard of the wastegate actuators failing on these cars, so I'd look at that last. An N75 is only £55ish from a dealer anyway.

You need to find out which valve it is first though! Do you have an error code?

It's the N249 that I've bought a 2nd hand replacement for. The only place I could find that had a new one was Skoda themselves and that was £150 unless they've quoted the wrong part (I didn't have the part number at the time). I had fault codes 17608 and 17563. It was the VAG specialist who maintains my car who said that he believed it was the N249. He contacted Skoda about ordering one and they refused to sell him one saying that they never go and that the fault codes we were getting were because the turbo was knackered. That was gonna be £900 for a new turbo from Skoda.

The N75 is the other part I was considering replacing but I thought I'd start with the N249 and the DV. If I've still got the problem then I'll replace the N75.

EDIT - Oh and the boost pressure was maxing at between 19 and 20psi so I didn't think there was a real problem with boost, I was just down on power for some reason. 148bhp at the fly when cold and 141bhp when hot!!

Edited 5 February, 200917 yr by Yella

£150 for a N249!!!! Must be a different part mate, cos there's no way they cost that much.

I bought mine direct from Skoda last summer for less than £50.

I thought perhaps it was a bit much but then that first scrappy wanted £90 for the used one so I presumed it must be right. Unless they've tripled in price since you bought yours there's definitely a mix up somewhere. Do you think my plan (above) sounds ok in relation to solving my problems?