filthy, just filthy
Join Date: May 2009
Location: United Kingdom
Have you tried to check the connection of all the injector leads? I almost shelled out over £300 to have an injector replaced only to find it was the connection on Injector 3 which had perished. Check from 1 to 4 and see if there is a visible difference in the condition. Also, start the car and gently wiggle the connection, if the engine note changes then you have found "a problem" because no firing will take place in that cylinder if the connection is lost.
This is a known issue for Vauxhall CDTi engines between 2004 and 2006. Something to do with poor air flow to ventilate that area. A fix was provided by Vx but nothing from Fiat/Alfa.
My solution was a bit Heath Robinson - until my garage can get the Vx fix ordered. I used a few cable ties to stop the wobble.
Hope this helps