I have a 1983 242GLT. I got it when it was barely running. I installed a new distributer, turbocharger, injectors, vacuum hoses, cleaned the throttle body, checked for vacuum leaks, and the idle control motor works. It still tachs at 1900 rpms after being run - in neutral. I'm getting a new throttle body setup tommorrow, thinking that the housing in the throttle body is worn since the engine has about 200k on it. Any other suggestions? Is this throttle body an answer? Thanks, Jon

Check that the throttle butterfly is closing all the way.My 82 glt was having the same problem,the needle assy in the idle adjustment assy had broken by some one servicing it and they had adjusted the idle stop and allowed the butterfly to be partly open to get it to idle and this was done by a Volvo dealership.The idle is high because you are getting too much air into then engine so you may even have a vacuum leak somewhere.go arounds and check all your vacuum hoses for crackes and then pinch each one off in turn and see if there is a difference in the idle speed.

Jon -

I am not a turbo guy, just N/A 240's. You said the idle air control, the usual suspect in high idle situations, works OK. I would do the "Pliers" test. With engine at its high idle, use a large pliers to slowly close off one of the vacuum lines from the IAC. If the idle drops, the IAC system isn't working. The motor may be OK, but it's not getting the signal from the throttle position switch.

Good Luck,

Bob

:>)