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View Full Version : Prostar 205 TBI Idle problems


rricard205
09-12-2011, 11:17 AM
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. Start from cold is 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.
Any help would be appreciated

mikeg205
09-17-2011, 09:29 AM
check the IAC and vacuum hoses...http://www.youtube.com/watch?v=406BTo4JE3A get the clymers engine manual as well. Could be a bad or dirty IAC (idle air control)

ahhudgins
09-17-2011, 10:37 AM
check the IAC and vacuum hoses...http://www.youtube.com/watch?v=406BTo4JE3A get the clymers engine manual as well. Could be a bad or dirty IAC (idle air control)

The video tells you not to spray carb cleaner into the port where the IAC motor mounts, but at least 50% of the time an idle problem can be caused by build up inside the port where the pintle makes contact. Look inside the port carefully and clean it out. I use throttle body cleaner on a rag and not carb cleaner. Use a lint free rag and something like a pencil to clean out the port. DON'T use a screw driver or anything metal because you don't want to cause a scratch inside the port. I have sprayed the throttle body cleaner in many IAC motors to flush all of the junk out and I've never ruined one (so far):D Just let it dry out first.