MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: schmidt_vr6 on September 25, 2015, 07:36:09 pm

Title: Golf gti mk5 no turbo power
Post by: schmidt_vr6 on September 25, 2015, 07:36:09 pm

Hi

My mate has a golf Gti and we've been out in it today and at high speed the turbo dies. Feels as tough theres no turbo power. As if we're driving a 2.0 Non Turbo.

It seems to spool upto about 2 and half rpm. Then you feel a little surge and that's it no turbo.

Once you switch engine off it's back to normal again

Any ideas guys?

Title: Re: Golf gti mk5 no turbo power
Post by: dan930 on September 26, 2015, 02:39:51 pm

Will it be a boost leak somewhere?

Title: Re: Golf gti mk5 no turbo power
Post by: th3_f15t on September 26, 2015, 07:03:23 pm

If the problem is going away upon turning the ignition off I'd suspect there is an electrical system putting the engine into a safe mode. A sensor somewhere might be failing so you'll need to run a diagnostic to see what, if any, error codes are being thrown up. If it was a boost leak you'd get no boost constantly rather than a few times then it going.

Title: Re: Golf gti mk5 no turbo power
Post by: schmidt_vr6 on September 28, 2015, 08:48:27 pm

I've had the car scanned today for fault codes and it's bought up one fault.

PO234 - Boost Pressure Regulation (Overboost Condition)

Any ideas guys?

Title: Re: Golf gti mk5 no turbo power
Post by: Scottymon on September 28, 2015, 08:50:09 pm

IF you haven't seen already: http://wiki.ross-tech.com/wiki/index.php/16618/P0234/000564

Title: Re: Golf gti mk5 no turbo power
Post by: schmidt_vr6 on October 13, 2015, 10:48:40 am

Had the car on the ramp, Tried a new Diverter Valve, Problem still there.
Tested the Turbo via Measuring Block on VAGCOM. It just wasn't getting the boost needed. So mechanic said I think the Turbo Vanes are clogged and needs to be sent off for testing.

Anyway whilst removing the Turbo we noticed that the N75 Valve one of the T-Piece had broken and was losing boost pressure causing the engine to go into limp mode.

A new N75 Valve is on order so we think its that what's causing the problem. So I shall report back if the fault is cured. Wish me Luck

Title: Re: Golf gti mk5 no turbo power - FIXED/SOLVED
Post by: schmidt_vr6 on October 14, 2015, 10:55:21 am

All Fixed. Was The N75 Valve That Was Shot  :driver: :driver:

Title: Re: Golf gti mk5 no turbo power
Post by: Dan_FR on October 14, 2015, 12:20:56 pm

Turbo Vanes!?!?! This is a petrol turbo with an internal wastegate, not a VNT Turbo....

At least it's sorted, you're lucky it didn't cost you a turbo as it could well have blown itself up. Luckily the ECu did its job, realising it had no control over the boost pressure.