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I'm trying to get to the bottom of the high idle I've got on my Mi16 engine (1.9 running normal Motronic ECU). I've checked the throttle switch and that seems to function fine, and the electrics are all good. I'm suspecting the throttle body plates aren't sealing as snuggly as they should when the throttle is shut. Am I right in thinking that at idle the throttle plates should be totally sealed shut and the idle relies on the air passing via the ISCV to get the air supply? So is there an easy way of testing how leaky the plates are?

Hi all, I removed my throttle body yesterday with the intention of giving it a good clean before re-fitting next weekend (standard 1989 1.6 XU5JA). My question is about the pipes/hoses that should have been connected as I seem to have a 'spare' hose fitting. When the TB is fitted to the car, there is a breather from the top of the TB that goes to the oil filler, toward the back of the TB is a small nipple that had a thinner (possibly vacuum) pipe and then on the bottom of the TB there is provision for three larger (about 10mm) hoses. When I removed the TB, only two of the three larger nipples on the bottom had a hose connected - these are the two that almost form a 'V' shape and they were both connected to the coolant system. So the question is; what should be connected to the third larger nipple please? It doesn't look as though it has had anything connected in the past but seeing as I've always struggled with the cars idling is there something missing here? Thanks in advance for any help or guidance Ian. ps I should mention that I am in the process of replacing and sorting out other parts that may affect the idle as follows; replaced SAD, replaced rotor and dizzy, new plugs about to go in, ECU temp' sensor on order and there are no air leaks (all done with a lot of help from the past posts in this forum - thank you).