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Well actually the throttle stop screw is the base idle adjustment screw on that car and it is supposed to have a base idle. Back when we first came out with the LH 2.4 cars we were having a rash of 122 codes and the Swedes decided that it was caused by a throttle valve that was improperly adjusted so they sent out a bulletin that outlined the new procedure. I did so many TV services back in the day that I can still do them in my sleep. You want to set that motor up so that it idles right around 530 RPM with the IAC hose pinched off and the throttle switch jumpered so it stays closed. Remove the throttle valve, clean it thoroughly, loosed the two small allen screws for the throttle switch, using a jumper wire jumper the throttle switch connector, pinch off the IAC hose (the hose between the IAC and the intake hose that goes on the throttle valve), bolt everything together, start it up and adjust the idle as close to a consistent 530 as you can get, tighten down the adjustment screw, adjust and tighten down the throttle switch, start it back up and check the idle, if it is still pretty close to 530 then take the needle nose vice grips off of the IAC hose and see where it is at, if all is good then reconnect the throttle linkage from the bobbin to the throttle valve, adjust it properly and all should be good, at this point I usually pinch the hose off one more time just to see where my RPM is. I use a fluke meter with an inductive RPM probe to monitor my engine speed and have a couple of jumper wires made up to jump that throttle switch connect but a fine paper clip should do the same thing. THere you have it, LH 2.4 throttle valve class 101.
Mark
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