Not a guide as such, more like a heads up to anyone who owns a early M42 engined e36. The revs have been going crazy the last few days on my 1992 318is. Sometimes it's fine, others it stalls and other times the revs rise and fall from anything from 400rpm to 1700rpm. I found a guide on bimmerdiy and was all set to remove the inlet manifold/throttle body etc to get to the icv to give it a clean. I had a butchers under the bonnet and it's completely different to the one in the guys guide. It takes under five minutes to take the icv off, it's located at the rear of the manifold as shown in this picture.
Simply pull the two rubber pipes off and unclip the the plug on the end, undo the 11mm nut holding it to the manifold and it's off!
Then simply clean inside where the pipes were removed as shown here..
I used brake/clutch cleaner, although you can get throttle body cleaner specifically for this kind of job.
After cleaning with an old toothbrush and cleaner I left it to dry for half an hour and refitted it to the car. Job done and car ticks over fine