'HDi's for Dummies' diagrams?

[old'uns]

i have managed tonight to reach the actuating rod and it does move. with engine running doesn't move at all and if i move it myself it makes no difference to boost, if anything the boost pressure drops to around 800mb?
i've had the solenoid thats the top one of the 2 on the AC apart and the diaghpram is ok, moves easily.
what is the one underneath it, appears to be a solenoid device as per the top one, also 2 vac pipes coming out of it?

so assuming that nothing is changing by moving the rod, Turbo kapput?
no time to get out for test run to live data log it, possibly tomorrow night.

[MikeT]

Well done! You're homing in on the problem.
Moving the actuator arm means the turbo vanes are not stuck.
Just to confirm, the actuating rod didn't move in at all (and hold position) when the engine started?

You won't make boost by moving the rod alone, it needs rpms as well and that needs fuel.

[old'uns]

rod didn't move at all with engine running, OH was in the car revving it and i was also feeling the rubber inlet pipes, still nothing

[MikeT]

rod didn't move at all with engine running, OH was in the car revving it and i was also feeling the rubber inlet pipes, still nothing

It should pull in as soon as vacuum reaches the diaphragm (within 30secs specified by PSA) so it looks like we're chasing a vacuum leak at this point.

[old'uns]

just so we're not chasing ghosts, i've plumbed the vac pipes near to the reservoir as the attached pic. the black scrubbed out pipe is the one that had been added, the yellow one next to it is the original and has been reconnected at the rear of rocker cover which i think is the pipe from the vac pump on camshaft end?



my logic was based on the diagram posted page3 by marc and i could only see 1 tee and the bodge seemed to be in that line of flow

[MikeT]

To be honest, I'm not au fait with your engine layout and I haven't studied the provided diagrams.... back in a while

[old'uns]

i've just had a rummage round and found some old ink refill syringes, i may give them a go tomorrow and attempt to trace the pipes

[MikeT]

Well I had a look at the parts diagram Marc kindly provided and my head hurts.
If you're more inclined to suspect the problem lies around the area you repaired, I'm no help, sorry.
All I know is, if there's no vaccum at the turbo pipe I'd follow it upstream where there'll be a dedicated solenoid for the turbo... and keep working my way back to the pump if necessary.
ETA Another diagram Marc posted, shows the turbo(9) solenoid(7) feeds directly off the pump(2).

[EDC5]

Ok, so were looking at a vac leak in the region of component 7 to 9 and possibly 2 to 7 (Vac pump(2), turbo control solenoid(7), and turbo actuation diaphragm(9) )

The valve on top of the A/C pump is the vac solenoid for the inlet doser.

If you get your syringes, try and see if you can move the turbo rod by applying a vacuum to the pipe between component 7 and 9 in that diagram.

[old'uns]

too wet and cold last 2 nights and i'm now down with sore throat, aching, shivers, runny nose etc on top of a 4.5hr journey from Bury to Cannock....110miles !
changed my crossing from tonight to Sun night for some more wriggle room although this may go on hold for a few weeks
i was half tempted by the 3.0V6 over @ Diss but a premium of 5-6k for the engine was too much, OH was definitely keen though.
sensible head means as there are no mid priced C5's in the spec i want within 3 hrs i'm off to look @ a Skoda Superb 170 DSG Elegance tomorrow and hopefully take that to France

i'll have a tinker tomorrow PM and Sun AM and report back, thanks to all so far, you're on the Xmas card list

[moizeau]

Sorry for the late reply, just got home after being in Wales for a couple of days. As Elis says the solenoids on the ac do the 2 dosers that are on yours. The 1 with the vac pipes on the left do the bypass (bottom oily one) the other the doser that is common to all our RHR engines. Now I'm back I'll have a look to try and picture exactly where the pipes go on mine. Neither of then will affect turbo boost, but the supply and res will. If you say that both dosers are working on the actuators, check they are the correct way round and you're not permanently bypassed, though I would suspect all is OK.

[old'uns]

no problem, this thread will go quiet for 2 weeks as of tomorrow, the deed has been done, very pleased with the Superb so far

[old'uns]

small amount of progress today....stripped out all the USB cables and DAB wires for a start.
little break in the rain gave me 30 mins or so to have a mess under the bonnet.
so far i know i have vacuum from the pump and the pipe that runs to the alloy one at rear of rocker cover, tomorrow i need to try and get my head around the 'what runs where' scenario and try to eliminate more things.

In other news, i've come across an old member off here on the Skoda forum and he's up to his old tricks of adding/messing with his car...yup, vb is around playing with a 3.2 V6 Superb

[moizeau]

Have a read of this
http://www.aussiefrogs.com/forum/peugeo ... p0299.html

[old'uns]

thanks, late afternoon reading coming up.
still raining here in Blighty