heavy oil deposits in induction manifold

Lawrence1973 · Post by **Lawrence1973** » 06 Jul 2009, 16:36

Hello All, I have a broken 406 1.9 TD and so have acquired a Xantia 1.9TD.
Both induction manifolds are caked in a heavy oily deposit - nearly half a centimetre thick. I am puzzled! does anyone know if this is normal or is it an indication of a fault? Exhaust gas recirculation? engine damage? I don't understand it because there must be a whole load of gunk going into the head and combustion chambers.

Anyone enlighten me?

Lawrence

Post by **CitroJim** » 06 Jul 2009, 18:10

Hi Lawrence

Good to hear you've gone and got a Xantia!

Let us know more details. I guess you have an Estate.

Now, the gunk you refer to is actually perfectly normal if the engine has EGR (which they do have post '96) and is as you suspect, a direct result of EGR action.

The best thing to do is to diaable EGR by blocking the vacuum to the EGR valve, the thing that looks like a little lantern on the RH end of the exhaust manifold. Lift the pipe from the valve and block it.

Do come and say hello in the Citroen forum where you'll find a very warm welcome

I'm sure you have lots of qyuestions if you've never owned a hydraulic Citroen before...

What is the fate of the 406?

Lawrence1973 · Post by **Lawrence1973** » 06 Jul 2009, 21:52

Yeah sorry Jim I just meant the engine.....I haven't actually joined the xantia club! yet! I just went for the 1.9TD lump. Everything seems the same apart from the odd brackets and engine mountings!

Fun and games de-armouring the injection pump! it was one with two bolts to drill out and a cunning split pin at the back tucked inside into the full load adjustment screw. I had to use all my cunning to get it out - I wound a screw into and tapped it out.

I need your advice about how to wire up the stop solenoid from the cables I have.....I can see myself scratching my head over that one!

Post by **CitroJim** » 06 Jul 2009, 22:04

Ahh right 8) Got the wrong end of the stick there Lawrence

You're getting good at pump de-armouring - forum specialist on that topic now

Lawrence1973 wrote: I need your advice about how to wire up the stop solenoid from the cables I have.....I can see myself scratching my head over that one!

No worries at all, be pleased to help

In fact I think I'm free on Sunday and rather fancy a run down to your way again and give the V6 a nice run in the country....

I'll also disable the EGR for you. Don't worry overly about the crud there as a few Italian tune-ups will soon shift it as you'll find it's very soft.

Lawrence1973 · Post by **Lawrence1973** » 06 Jul 2009, 22:56

Smashin!

Be good to see the old V6.....got it sorted then?

I reckon I should be around, will drop you an email.

Hope to see you then. Cheers

L

Post by **CitroJim** » 07 Jul 2009, 12:38

Lawrence1973 wrote: I reckon I should be around, will drop you an email.

Hope to see you then. Cheers

I've had a check of my diary Lawrence and Sunday is confirmed good

How far are you away from starting her up?

I'll bring my full electrical kit so we can do a proper job of the stop solenoid...

Lawrence1973 · Post by **Lawrence1973** » 07 Jul 2009, 17:17

diamond,

Long way until the fire up I think!

steelcityuk · Post by **steelcityuk** » 23 Jul 2009, 11:06

Are the heavy deposits a bit like this?

These are from a 2.5 TD. EGR related I'm sure. The engine didn't half run clean afterwards.

Steve.

Lawrence1973 · Post by **Lawrence1973** » 23 Jul 2009, 22:45

Nice one!
Yes they are like that. Makes you wonder doesn't it.....is it all about engine emissions being cleaned up no matter what happens to the valve seats and all?!

Disconnection of the EGR is starting to look appealing.!

Cheers for photos

steelcityuk · Post by **steelcityuk** » 24 Jul 2009, 10:43

You're welcome.

Here's how the EGR looked from the same engine -

And here's how I blocked it off with a metal disc -

Steve.