View Full Version : 1995 prostar 205 idles high sometimes

09-12-2011, 12:25 PM
I have a 1995 prostar 205 with TBI. It will occasionally start to Idle high(900-1000) and I need to shut it down to get back to 600. Starts from cold are fine. Idle will then be good for some time than start to drift up. I had no error codes show up. The other day the Idle went to 1600. until I shut it down. This was the highest. Also need to give it a bit of gas to get to start after boat warms up. If not the boat will just kick but not stay running.
Any help would be appreciated

09-13-2011, 11:11 PM
A few ideas:

1. Throttle is not returning to the closed position because the spring is weak or the cable has interference.

2. Vacuum leak

3. Perfect pass cable is bound causing interference

09-17-2011, 09:25 AM
here's a video which explains checking the IAC (idle air control) http://www.youtube.com/watch?v=406BTo4JE3A

IAC could be bad or dirty...