blue smoke at 30mph

ye nickcc was your smoke blue or black? going to leave the egr valve on for a while then going to refit the synergy2 if you take the manifold off do you need any new seals or gaskets to replace it?

Have to be honest and never checked the colour but as it was burning off the oil I imagine it would have been blue. I have never removed the manifold but there will be loads of info if you use the search facility, I seem to remember that the gaskets should be OK to re-use but I stand to be corrected

Correct me if i'm wrong somebody but isn't the EGR vacuum hose part of the same circuit as the turbo solenoid?

With the EGR bypass fitted could this somehow affect how the turbo behaves in certain circumstances and cause it draw oil into the intake side if the turbo's oil seals are on their way out?

Just seems like a bit of a coincidence to me... blue smoke is usually oil, not overfueling and the EGR is on the intake side of the engine so therfore that must be where it is entering the combustion (as opposed to through worn rings).

Edit. Further to the above, what if when the EGR bypass is fitted there is a leak in the vacuum circuit? what would that do?

crankcase emission control :

" .. blow-by gases and oil vapour are drawn from inside the crankcase .. .. into the intake tract to be burned by the engine during normal combustion. Crankcase gases are drawn via a depression limiting valve. The valve *closes progressively as the engine speed increases*, so limiting the maximum depression in the crankcase. "

( so sayeth the haynes )

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i don't know how that valve works ..
i.e. engine revs speed .. or 'load' ..
but .. might explain the blue smoke at low vehicle speed ..

( as opposed to blue smoke at most engine speeds ..
( which Might be more in-line with the knackered turbo seals theory ..
( or worn piston rings .. .. etc etc ..

the egr bypass will provide better airflow ..
thus sucking more crankcase vapour through ..
the intercooler will probably cool said vapour .. changing it to a liquid film ..
which probably explains the oily film .. and odd small puddle .. found in the hosing
that leads from the intercooler to the egr valve position ..

if the engine is high milage ..
there's probably more accumilated oily gunk in the induction system
~~~~~~~~~~~~~~~

been thinking about it .. after fitting an egr delete and silicone intercooler hoses ..
and noting the different distribution of small amounts of oil .. before .. and after ..

and .. the crankcase oil level in mine is slightly over what it should be ..
plus .. i've been making a point of using low engine revs since fitting those parts ..
( although i've not noted any extra blue smoke pouring out of the exhaust .. )

Correct me if i'm wrong somebody but isn't the EGR vacuum hose part of the same circuit as the turbo solenoid?

Click to expand...

it is .. ..

but .. although the engine management system controls the turbo vanes ..
and the egr valve .. via the vacuum system and its solenoids

would the management system change its behaviour towards the turbo vanes ..
if it 'knew' that the egr valve was 'closed' ? i.e. via the egr vacuum hose being blocked-off
( i don't have the answer btw ..

i'm assuming it still gets the egr solenoid to operate so it presents a vacuum depression
to the egr valve diaphram ..
but i sort of doubt it knows that the diaphram is stuck 'closed' .. as-it-were ..
( as in the case of an egr bypass/delete being fitted )
given 'no vacuum leaks' it will probably 'see' the system as operating normaly ..

.. there's no sensor to tell the engine management that exhaust gases Are being fed
to the intake manifold .. ( unless i've missed something )

~~~~~~~
that's my theory anyway ..

hd3 said:

it is .. ..

but .. although the engine management system controls the turbo vanes ..
and the egr valve .. via the vacuum system and its solenoids

would the management system change its behaviour towards the turbo vanes ..
if it 'knew' that the egr valve was 'closed' ? i.e. via the egr vacuum hose being blocked-off
( i don't have the answer btw ..

i'm assuming it still gets the egr solenoid to operate so it presents a vacuum depression
to the egr valve diaphram ..
but i sort of doubt it knows that the diaphram is stuck 'closed' .. as-it-were ..
( as in the case of an egr bypass/delete being fitted )
given 'no vacuum leaks' it will probably 'see' the system as operating normaly ..

.. there's no sensor to tell the engine management that exhaust gases Are being fed
to the intake manifold .. ( unless i've missed something )

~~~~~~~
that's my theory anyway ..

Click to expand...

If you are aware of the famous 'dying duck' noise and the easy cure for it - then the EGR solenoid is inactive due to having the vacuum pipe blocked at source rather than at the EGR (or the by-pass)

If you are unaware of the duck - just search for threads on 'duck noise.'

Cheers,

Singvogel.

you have lost me, I have read your post twice and had to go get some paracetamol :speakenglish: I knew as soon as you got technical I would;d be lost going to do a 150 mile round trip tomorrow so i will see how it runs

going to do a 150 mile round trip tomorrow so ..

Click to expand...

enjoy .. ..



i'll be popping a declofenac ..
'n looking for a home under the bonnet/hood .. for a small yellow box

Not sure where the burning oil thoughts come from, as the OP states that the oil level is OK and assuming that there is no diesel or water contamination, I can only guess that it is overfuelling related.

:just an update I did an 150 mile round trip yesterday car ran great did not use a teaspoon of oil. the only thing I missed was not having that extra bit of Humph you get from the synergy2 so I am going to leave things as they are until after Easter then I am going to gradually refit the parts. so to sum up it looks as though the BLUE SMOKE was over fuelling ???? I will post what happens when i have refitted the synergy/pierburgh/egr bypass.