OK this has developed into MoT failure on emissions
My results were (pass mark in brackets)
1st fast idle - CO % Vol
2.53 (0.30) HC ppm Vol 70 (200) Lambda
0.93 (0.97/1.03)
2nd fast idle - CO % Vol
2.37 (0.30) HC ppm Vol 72 (200) Lambda
0.93 (0.97/1.03)
Natural idle - CO % Vol 2.15 (0.50)
They too suggested a vacuum leak. I have inspected every hose I can get to and been spraying carb cleaner to try and find a leak but to no avail so far. The lambdas are providing so weird responses. Sometimes they are switching as you would expect, sometimes flat lining, and sometimes a steady 0.5ish volts. I have attached a log of them from an around town drive.
I found a valve that is clicking at a very fast rate, picture attached. Does anyone know what this is? Something to do with tank venting?
On the other side of the car there is a vacuum tube that appears to be heading aft. Any one know where that ends up?
I am assuming you have to take the plenum off to get to the 3 hoses on the back of the block mentioned in Audipages? If I take the plenum off can the seals an gaskets be reused or should I get some in ready before I start?
Any help would be greatly appreciated, I getting no where fast and running out of ideas
I seem to be struggling with the attachments so I'll try those in a separate post