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[P6UL K]

No worries, good to know for the future!

I might start a 'DTi Owners Roll Call' thread, at least we'll all know who's who out of the few of us that own them.

[dazza88]

Ive just got a omega 2.2 dti lol and love it much cheaper to run then all my petrol omegas ive had 

[P6UL K]

I'm looking forward to getting this issue sorted and driving her around!  Been parked up for around 2 years now!

[P6UL K]

Bottom line is that these diesel setups are simple.

A very useful diag tool is a Gunsons Lo-Gauge, this allows you to measure the vac in the system be it pre or post actuator valve.

You can also use the 'suck' method to test things by sucking on certain pipes to ensure the actuators operate.

There's a couple of Vac tanks that can get missed while trying to diagnose issues - one in the drivers wing (where the carbon canister would be on a V6) and one behind the pollen filter. Most vac issues seem to be traceable to those rubber elbows imho.

Is this the one in the drivers wing you speak of...?

[Marks DTM Calib]

Thast the diesel pre-heater.

Been looking for one of these to play with if anybody has a spare

[P6UL K]

I noticed there's a couple if vacuum hoses going into the cabin through the bulkhead on the drivers side... Should I be concerned about these?

[P6UL K]

I've also found the little vacuum box thing by the pollen filter, does it come out? As its a bugger to get at 

[andymp]

The only thing to go wrong with the vacuum reservoir on the pollen filter box is the two rubber elbows on the top perishing...

[andymp]

Is the management light on, if not does it flash on when you start up?

[andymp]

Best way to test the vacuum system is with a vacuum gauge. It should read at least 25 inches. Flick / wobble all the rubber connectors. Any drop in the vacuum reading when you disturb a rubber connector means its split or perished. The U shaped vacuum bridge at the back of the head in particular suffers from the heat and perishes or collapses, which is critical because it supplies everything other than the brake servo and causes all sorts of nasties.

The turbo is a variable geometry unit, so it doesn't need a wastegate. The device the vacuum pipe feeds is to adjust the vanes. With vacuum applied the vanes are fully extended, This is the normal operating condition at idle. When the boost sensor towards the back of the inlet manifold senses the boost approaching 2 bar, the vacuum is cut off, the vanes retract and boost is controlled.

Also, in the event of the ECU (or EDC) picking up a critical malfunction, limp mode is activated, one feature of this is that the boost solenoid is deactivated, the turbo actuator gets no vacuum so boost is inhibited.

Are you getting vacuum to the turbo actuator at idle? You should see the actuator pull towards the drivers side of the car upon starting the engine?

[andymp]

P.S. The 2 vacuum pipes that disappear into the car, one comes from the vacuum reservoir on the pollen filter housing, feeds  into the car as a vacuum feed for the air recurculator valve for the climate, and the other comes back out of the same grommet and feeds the heater bypass valve below the exhaust.

So, The vacuum system is split 3 ways. The brake servo, The climate control feed, and the engine systems feed. Hence the need for 2 reservoirs.

[P6UL K]

Andy where have you been?! Amazing info, thank you very much!! I'm at work at the mo but will reply in full tomorrow once I've been to the car and tried your suggestions 

[markspark]

Had my 2.2Dti for 4 years and all i can say about that engine is it was bomb proof never missed a beat the only major issue i had is that they only come in the three pedal versoin pitty no one can covert them to the two pedal version

[P6UL K]

Had my 2.2Dti for 4 years and all i can say about that engine is it was bomb proof never missed a beat the only major issue i had is that they only come in the three pedal versoin pitty no one can covert them to the two pedal version

Now that would be a pointless conversion! 4 pot, auto, diesel! Really?

Each to their own I suppose! 

[markspark]

Had my 2.2Dti for 4 years and all i can say about that engine is it was bomb proof never missed a beat the only major issue i had is that they only come in the three pedal versoin pitty no one can covert them to the two pedal version

Now that would be a pointless conversion! 4 pot, auto, diesel! Really?

Each to their own I suppose! 

It wouldn't be pointless for me as i have a damaged left shoulder and the gear changing is very painful at times i now have the vec c 2.2dti auto and apart from the injector seals leaking a little it does drive quite well for a vec c its nothing compaired to the omega tho