VW Golf mk5 tdi intermittent turbo and brake loss

bitch please · 18-06-2018 09:10AM #1

i have a 04 tdi mk5 golf, last night it developed a problem where it would lose most of its power, like the turbo blew but there was no black smoke.

The brake pedal went very stiff but had no braking like it was air locked, however the problem remedies itself if i turn the ignition off and back on.

Also there was oil coming up through the cap.

The diagnostic reader came up with emissions error

Any help would be greatly appreciated

biko · 18-06-2018 09:27AM

I split up your post a bit, it was hard to read.

What was the code you got from the reader?

Oil coming up through the cap? You mean oil cap on top of engine? I have not seen that before. Is the oil level correct?

rex-x · 18-06-2018 11:43AM

The only thing the turbo and brakes have in common is that they both use vacuum so that is certainly where I would be starting. Lose vacuum and you will lose the ability to operate the vnt vanes so no boost and no servo assist for the brakes so they will go hard.

bitch please · 18-06-2018 02:26PM

rex-x wrote: »

The only thing the turbo and brakes have in common is that they both use vacuum so that is certainly where I would be starting. Lose vacuum and you will lose the ability to operate the vnt vanes so no boost and no servo assist for the brakes so they will go hard.

thanks for the reply, vtn vanes?

bitch please · 18-06-2018 02:27PM

biko wrote: »

I split up your post a bit, it was hard to read.

What was the code you got from the reader?

Oil coming up through the cap? You mean oil cap on top of engine? I have not seen that before. Is the oil level correct?

yes, and no

rex-x · 18-06-2018 02:30PM

bitch please wrote: »

thanks for the reply, vtn vanes?

Vnt vanes, your turbo is variable geometry. With vacuum applied the vanes closed and you get max boost, with no vacuum they open and you get little to no boost. This is all controlled by the ECU but if there is no vacuum there is no control

bitch please · 18-06-2018 07:23PM

rex-x wrote: »

Vnt vanes, your turbo is variable geometry. With vacuum applied the vanes closed and you get max boost, with no vacuum they open and you get little to no boost. This is all controlled by the ECU but if there is no vacuum there is no control

i see thanks for the replies

bitch please · 18-06-2018 07:31PM

rex-x wrote: »

Vnt vanes, your turbo is variable geometry. With vacuum applied the vanes closed and you get max boost, with no vacuum they open and you get little to no boost. This is all controlled by the ECU but if there is no vacuum there is no control

Does this mean i need a new turbo

rex-x · 18-06-2018 08:11PM

bitch please wrote: »

Does this mean i need a new turbo

No it means you need a good mechanic to do a proper diagnosis of the problem. Its a safety issue so worth getting sorted properly

George Dalton · 18-06-2018 08:21PM

Any mechanic who knows what they are doing will have that problem diagnosed very quickly. And it won’t be the turbo.

VW Golf mk5 tdi intermittent turbo and brake loss

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