1994 Cad Deville Concourse 4.6L Northstar V8 engine.
Engine idles up and down on it's own. Code P030 comes up. Installed a new ISC (Idle Speed Control motor). Throttle Position sensor code came up and will replace it tomorrow. On the big machine it reads.4V and it should be higher. I have all 3 big books 1, 2, and 3 Service Manuals and have not found that information on "how to".
Thursday, January 12th, 2012 AT 8:05 PM