Hi,

As some of you already know I have been having overboost issues with my car since May, a local indy informed me that my driving style had made it worse, so that was changed by using more of the rev range. Since the change of driving, I was only experiencing 1 overboost (limp mode) a month, until the last couple of weeks. Lately I have experienced, on a run of 150 miles, that I tend to get three overboosts towards the last 50 miles of that journey. Last weekend, on the same journey, the car went into limp mode and 'Emissions ! Workshop' was displayed on the screen. Cycling the igniton resolves the limp mode and driving returns as normal, the warning however stays (yellow engine light on permenantly). I can clear the warning via VCDS but only to have it return sometime later. The following is a readout from the car prior to the DTC's being cleared:

Address 01: Engine Labels: 03G-906-016-BKD.lbl

Part No SW: 03G 906 021 LD HW: 03G 906 021 LD

Component: R4 2,0L EDC G000SG 9184

Revision: --H07--- Serial number: SKZ7Z0G4290831

Coding: 0000072

Shop #: WSC 73430 790 00000

VCID: 6CD778134FF94C78EDD

1 Fault Found:

000564 - Boost Pressure Regulation

P0234 - 000 - Limit Exceeded (Overboost Condition) - Intermittent

Freeze Frame:

Fault Status: 00110000

Fault Priority: 0

Fault Frequency: 5

Mileage: 187301 km

Time Indication: 0

Date: 2000.00.00

Time: 10:58:25

Freeze Frame:

RPM: 2772 /min

Speed: 119.0 km/h

Load: 48.6 %

Voltage: 14.44 V

Bin. Bits: 00101000

Absolute Pres.: 1958.4 mbar

Absolute Pres.: 2539.8 mbar

Readiness: 1 1 0 0 0

As there are no other codes except the overboost, can anyone please advise ?

Sorry, forgot to say the car has covered 116K miles

See http://www.briskoda.net/forums/topic/243533-the-mr-muscle-vnt-turbo-treatment-thought-we-needed-a-guide-of-sorts/

Get the Mr Muscle out on the exhaust side of your Turbo as the vanes are sticking due to soot.

Paul

Hi Paul, would that also cause the emissions warning ?

Yes that is your issue, easiest way on a PD140 would be to drop the exhaust downpipe off of the turbo, best to get a new genuine clamp and gasket.

If you are doing it yourself make sure that you are safe working under the car, so always use ramps or axle stands.

Paul

'Emissions Workshop' really just means 'Oh look your engine management light has come on', for those posh people who have Maxidot ;-)

Or I need to talk to the dealers computer - hope you are still in warranty - LOL

lol thanks for your comments guys, I'll have a go at the weekend, pending the weather

Edited 31 October, 201213 yr by cj_uk

Parent's Octavia had this ... diagnosed as the actuator arm having stuck.

Parent's Octavia had this ... diagnosed as the actuator arm having stuck.

yes sticky vanes causes this, mr muscle exhaust side of turbo

Seems strange though, I planned to carry out the Mr Muscle process a couple of weeks ago (got stuck as I wasn't too sure how to remove the exhaust clamp) but the actuator arm moved when pushed, a good cm or so

did it feel gritty? if it moves its prob just getting partially stuck

I didn't noice any gritty feeling, but there was a resistance there, would that be from the vacuum unit ?

It is possible that it it slow to react hence only getting over boost occasionally.

I'd go as far as saying I'm 100% confident that your over boost will be caused by a slow returning VNT mechanism.

You need to give it a good soak with the Mr Muscle and work the actuator. I'd then rinse it out with some brake cleaner, put it back together and take it for a good run.

Beware though that it will smoke a bit to start with.

Paul

as above, you could follow my guide, the second half of the thread goes into the type of engine you have and i go into more detail of what to do

http://www.briskoda.net/forums/topic/243533-the-mr-muscle-vnt-turbo-treatment-thought-we-needed-a-guide-of-sorts/

thanks guy's, if I can remove the exhaust clamp, then I'll be laughing

Edited 1 November, 201213 yr by cj_uk

or the wee, manifold to egr cooler pipe, and use ma guide. Thats the way ive always done it on that engine

I looked at that whilst laying under the car and thought how the bloody hell do you get that off lol