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Have seen quite a few threads asking about these and blaming them for allsorts of faults, I guess not many actually have Haynes manuals these days? A very much maligned and over thought device, its a very simple rotary disc operated by a bimetallic spring, which has an electric heating element next to it, as well as being bolted to the side of the thermostat housing, there really isn't a lot to go wrong and they don't move fast and wear out like a more modern ICV/Idle control valve The Jetronic system is very much clockwork and has no idle control built in, the SAD purely reduces the amount of supplementary air that bypasses the Throttle butterfly the longer the ignition is on and the warmer the engine gets. So here's an extract from the Haynes manual. as you can see, very simple! here's the schematic - As you can see, its earthed through the starter solenoid, the very same wire that causes that oh so common 'click' and no chooch from the starter motor when you turn the key, so if that's causing voltage drop issues to the starter, it will also cause a high resistance on the earth side for the SAD so it'll take longer to close.

hi i have very nearly finished returning my 1988 gti back to 1.9 8v from gti 6 but i seem to have a problem with the injectors both wires seem to show 12v and as i understand it one should b 12v and the other should b negative switched by the ecu to make it pulse, do the injectors get any other signals other then the ecu as it seems like something is missing ?? when i tested the injectors with a (bulb) in the end off the plug it didn't flash at all until l stop'd cranking and then at the very end it flashed once it all seems very odd dose any one no what each wire from the ecu plug dose as it would b helpful as i could then check wiring i need them identified by colors and ecu pinouts as i have no number's on my wires due to them being cut by previous bloke bodging in the gti6 engine any help much appreciated thanks olly