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Yeti110

Member Since: 04 Jan 2018
Location: Skåne
Posts: 27

Turbo Overboost

Hi,

I wondered if anybody could please, offer me some advice? I have checked my Turbo actuator arm and it is free and very loose across the entire range of its travel. (I have only checked when engine cold).

Would that mean I could/should rule it out as a cause of an (intermittent and very frustrating) Turbo Overboost P0234 fault code?

I have replaced MAF and MAP sensors along with turbocharger hoses. Is there anywhere else I can look before getting involved in the turbo? I cant spent that kind of money until I'm sure its the solution.

Would very much appreciate your thoughts.

8th Aug 2018 10:23am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16873

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

It would certainly suggest to me that the problem is not the vanes in the turbo sticking (unless they only do it when hot, of course). I would be more inclined to look towards the actuator or wiring harness, or sensors.

8th Aug 2018 10:46am

Yeti110

Member Since: 04 Jan 2018
Location: Skåne
Posts: 27

Thank you Blackwolf.

How could I check either the actuator or the harness?

I don't think it could be the vanes sticking. it only happens occasionally, usually when I'm overtaking a massive truck with a black Audi behind me.

8th Aug 2018 11:06am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16873

For the harness all you can really do is inspect it carefully, paying particular attention to the places where it touches the engine, mounting brackets, or anything else.

8th Aug 2018 3:01pm

nickhodgson

Member Since: 08 Dec 2009
Location: Zambia
Posts: 172

Can Turbo Overboost P0234 fault code not be related to a leak in intercooler or pipes? 1995 300tdi Defender 90 P/UP
2011 Puma Defender 130 D/C
2000 300tdi Defender 110 P/UP
2015 Discovery 4 SDV6 HSE

8th Aug 2018 3:09pm

Yeti110

Member Since: 04 Jan 2018
Location: Skåne
Posts: 27

Yes, that's what I read elsewhere on this forum. The intercooler pipes I have renewed, to rule them out.

I will check the wiring harness to see if there is anything visually wrong. Thanks for the replies.

The problem I have here in Sweden. Particularly where I live, is Defenders are very rare. Which means specialists do not exist. A main dealer charges 200 pounds an hour for diagnostics. Its cheaper for me to replace the less costly items in the hope I get lucky. The downside is that it is a hit and miss process and may result in a new turbo......hopefully not though.

8th Aug 2018 6:48pm

Stu_XS

Member Since: 22 Jul 2018
Location: Hampshire
Posts: 86

2013 Defender 90 Puma 2.2 XS CSW Aintree Green

I don't know the Puma turbo's too well but I've seen plenty of overboost scenario on VAG engines and it is normally the vanes stick when you are on full throttle acceleration heading down a slip road or something.

The vanes go the full extent of travel and jam in that position momentarily.

I'm not suggesting or condoning this method but you get the idea. I think you can buy products designed for this job these days.

Stu...

2013 Aintree Green 90 XS SW 2.2 Puma

8th Aug 2018 9:06pm

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