Check the vacuum circuit - my 806 was loosing power and going into limp home mode.
There was a tiny tear/hole in the rubber diaphragm that operates the pollution control butterfly valves (aka swirl control actuator).
The leak was enough to loose vacuum such that when the turbo was required there was not enough vacuum left to operate it.
Also on my 806 the cup at the end of the accuator rod had broken too.
I fixed it but still had the power loss until we took the thing apart and discovered the hole.
Took ages to diagnose as all the faults point to elctrical/turbo related problems.
Many Thanks for the info. I have been told the heat exchanger has got a split? what are the implications with this as the gases leak out from time too time. Could tis fault have something to do with the loss of power?
Hi, I have a peugeot 207 diesel and I have had the p0234 fault come up, the aa man has cleared the fault on the car, and said when he looks at the turbo its looks fine. Does anyone know what this could be???
p0234, most of the time it is a problem with the turbo control valve. There is an electric valve that is controlling the turbo with vacuum. Check the electric valve, and the filter where the valve can let escape vacuum. The filter is placed by the diesel injectors, when they leak or leaked the filter can be blocked with dirt.
I just thought I'd add a couple of pictures from my 806 to show the vacuum circuit and the actuator that operates the pollution control butterfly valves (aka swirl control actuator).
There is a massive thread about the swirl actuator in French on forum-peugeot, this page shows the actuator as item 15.
In French they call it "capsule de commande du volet d'air"
This is a new one as a spare part:
It has two problems eventually the socket on the end of the actuator arm gets a crack and then snaps. So although the actuator actuates the swirl valve control lever doesn't move.
The other problem is more subtle, over time the actuator diaphragm gets holed and vacuum is lost. Since the holes in the diaphragm are small loss on vacuum is slight and behaviour varies with driving style/mode. As vacuum is lost the other solenoids attached to the same vacuum circuit erroneously show failures. This can show as intermittent EGR failures sending the engine into limp home mode.
This picture highlights it on my 806 HDi:
These are the vacuum solenoids connected to the same vacuum circuit:
So people start to look at the EGR/turbo for the problem - when the fault is a few pin prick sized holes in a rubber diaphragm elsewhere.
Hi,
i'm a newby as well but i've been told that the vacuum pipes could have been removed and replaced incorrectly causing the overboost?
Could anyone confirm this?
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