Over boost fault

[gregozedobe]

He also suggested steam cleaning the combustion chamber and exhaust manifolds etc by taking the air filter off, holding the revs high on a running engine and trickle/mist 0.5lts of water very very slowly into the air intake. The idea is to create steam that removes all the carbon but not in quantities that will damage the engine. He also said that when doing this make sure the engine and exhaust is up to operating temperature and that the exhaust is aimed away from anything as the black muck that gets blown out is filthy.

Any thoughts?

I'd be very reluctant to even try the water in the inlet thing on my TDI for fear it would clog up the (very expensive) DPF. If you had a straight through exhaust it might do something (but not sure if that something would be good or bad).

Certainly if you gave it too much water at once there is a very real danger of getting hydraulic lock (diesel combustion chamber volumes are pretty small at tdc).

With a VW TDI you are more likely to have problems on the intake side from oil and EGR gunk, and water won't shift either of those.

[Ivo]

I dont have a DPF on mine. The trick is to keep the revs very high and just trickle/mist water in. I was hoping it may help clean the variable vanes on the turbo.

[gregozedobe]

The water may just sit around in all the pipes and intercooler. It has to go a long way from the air intake, through the inlet side of the turbo, through the intercooler and then into the inlet manifold before it actually gets into the engine. I doubt much water would actually get to the engine at all (unless you devise a way to deliver it directly into the intake manifold).

The technique may be OK for a non-turbo diesel, but TDIs are a bit more complex.

If you do it to yours please let us know how it goes (and what difference it makes to performance and economy).

[Ivo]

Hmmmm maybe I should do it at the start of a long trip that way there will be plenty of time for it all to be sucked through ?

[Silver Caravelle]

Hmmmm maybe I should do it at the start of a long trip that way there will be plenty of time for it all to be sucked through ?

Personally, I wouldn't do it all for the perceived benefits. Very expensive if the engine locks solid and would not be easy to explain to an insurance company if there was no a flood in sight!

Diesels of any kind do not cope with sucking in water. They just seize and very seize very quickly.

Cheers,

Scott