I know, another dumb sounding question.
I was doing some research into my car's juddering issue and logged into the Vauxhall owners website.
It seems there's sometimes an issue with dry joints on the throttle valve pcb, on the back of the main connector
As to what the throttle valve does, (it rarely moves in normal running) it seems it's thought of as working alongside the EGR valve. Some say it stops the engine running on when you switch off...I've never seen mine move.
I operated the throttle valve with AlfaOBD and it seems to respond normally. But curiosity got the better of me
. I took the throttle valve assembly off and opened it up and the circuit board cavity was completely flooded with black oil, I can only guess that it has come up through the breather when my dpf was blocked and pressurising the crankcase.
I cleaned it out and not only have I found a couple of dry joints, I've also found a blown IC !
picture here. throttle valve _labelled | Flickr - Photo Sharing!
So I've put it back together and the throttle valve no longer operates with AlfaOBD
The test drive immediately after shows the car still runs great
So, does anyone know when the throttle valve works ?