156 1.9 jtdm Starting Problem: SOLVED!
Well, this was my problem, the vacuum actuator, or more to the point, the flap that it is supposed to operate.
If you see my previous thread, I had an intermittent starting problem. The engine would turn over and over but just not start, then it would either just start as if there was no problem or start after a short wait...say, a brew or even just a short walk away with a shed load of swearing etc.
After months of the odd 'no start' at the most inopportune times, I noticed that the flap either moved or didn't move depending on the mood of the car! It was sticking.
No fault codes show up for this.
The flap closes off the air flow to the engine to aid stopping and cut down on vibration when the engine is switched off (so i am told). It was sticking in the closed position and not resetting to 'open'.
I removed the upper turbo hose connection (easily done) to find black, oily 'Kack' all over the flap and its housing. Once cleaned with thinners and a specially adapted wheel cleaning brush...presto! no more sticking.
Although I don't know were the said 'Kack' comes from (any ideas?), the clean up worked.
It has started again now, very occasionally, so I just get under the bonnet, flick the plate up that operates the flap (the one that the actuator is trying to operate), and it starts...first turn.
Have a look at the pictures below and let me know if this helps. Photo 2 is how it should look to start the engine.
If anyone has any more to add, please feel free.