Porsche 928 Idle control valve Up for sale is a Working, in excellent condition Porsche Idle Control Valve.part numbers at the top of the listing, check the part number off your original unit. These are located on center area of your engine, under the mass air flow meter.. - . This unit offers a 30 day functionality warranty. As always with this type of component your best bet is to match the part number to the one on your original unit. A defective unit can cause an idle speed that's too high or too low, or totally erratic. A very bad unit will cause stalling and then no-start (unless you give it gas) If your car does not have these issues but you intend to keep it a while, get an extra now while it's cheap! These units now have to be special ordered from most dealers new for big $$ (often times over $1000!), and you can never find one when you need one. Even now finding a good one second hand is getting to be quite difficult as these cars get older.Comes with a 30 day functionality warranty. See return policy details for more info.