Potential Boost Issue

[av07]

Hi All,
Hope life is treating us all fairly.

I purchased an '02 Cupra 20v 1.8t back in August last year. The car has served me well, and I'm looking to keep it for a long time.
From purchase, I've noticed an issue with boost and wanted some help to be pointed in the correct direction.

When on the road, I find that boost begins to build and then stops for a split second, holding the boost, before building again. This happens several times throughout the rev range and across all gears. The issue is most apparent when I am at full throttle & is quite noticeable. I have checked for any codes with no luck there which leads me to think this is more of a mechanical issue as opposed to a electrical one. I may well be wrong in that sense though.

Any help/guidance would be greatly appreciated. Thanks in advance.

Regards

 

[Alexis27]

A faulty N75 valve can cause that on/off boost effect. It's a pretty easy DIY job to change.
The rubber diaphragm in the recirculation valve can also age and stop it working. Another easy change.
I've always swapped these two on every Leon I've ever bought just as a matter of course.
They never throw a code even if they're faulty.

 

[Alexis27]

Go OEM

AUDI TT 8N Boost Control Valve Solenoid 06A906283E 1.8 Petrol NEW GENUINE | eBay

Genuine parts. All of our parts are new & GENUINE! Part number.

www.ebay.co.uk

They used to be about £30 back in the day

Forge recirc valves are good. You can safely go second hand

Forge Motorsport VAG 1.8T 20v Turbo Recirculation Diverter Valve Silver FMDV007M | eBay

Forge Motorsport VAG 1.8T 20v Turbo Recirculation Diverter Valve Silver FMDV007P. Condition is Used. Dispatched with Evri Postable.

www.ebay.co.uk

OEM is here

NEW GENUINE AUDI A4 A6 TT 1.8T PETROL ENGINE OVERRUN CUT OFF DIVERTER VALVE | eBay

FOR SALE IS A NEW GENUINE AUDI A4 A6 TT 1.8T PETROL ENGINE OVERRUN CUT OFF DIVERTER VALVE TO FIT - PART FITS ONLY MODELS WITH 1.8T PETROL ENGINES. - AUDI TT (2003 - 2006). - AUDI A6 (2002 - 2005). -AUDI A4 (1999 - 2009).

www.ebay.co.uk

Again, used to cost a lot less!

 

[av07]

Go OEM

AUDI TT 8N Boost Control Valve Solenoid 06A906283E 1.8 Petrol NEW GENUINE | eBay

Genuine parts. All of our parts are new & GENUINE! Part number.

www.ebay.co.uk

They used to be about £30 back in the day

Forge recirc valves are good. You can safely go second hand

Forge Motorsport VAG 1.8T 20v Turbo Recirculation Diverter Valve Silver FMDV007M | eBay

Forge Motorsport VAG 1.8T 20v Turbo Recirculation Diverter Valve Silver FMDV007P. Condition is Used. Dispatched with Evri Postable.

www.ebay.co.uk

OEM is here

NEW GENUINE AUDI A4 A6 TT 1.8T PETROL ENGINE OVERRUN CUT OFF DIVERTER VALVE | eBay

FOR SALE IS A NEW GENUINE AUDI A4 A6 TT 1.8T PETROL ENGINE OVERRUN CUT OFF DIVERTER VALVE TO FIT - PART FITS ONLY MODELS WITH 1.8T PETROL ENGINES. - AUDI TT (2003 - 2006). - AUDI A6 (2002 - 2005). -AUDI A4 (1999 - 2009).

www.ebay.co.uk

Again, used to cost a lot less!

I appreciate the suggestions here.

Understandably part prices have gone up but thank you for providing me with some links non the less.

Regards.