Re: 525 Efi High Pitch Noise?????????
 

Istill say it sounds like iac

Re: 525 Efi High Pitch Noise?????????
 

what would cause the iac to go bad? anything else to look at while in shop?

Re: 525 Efi High Pitch Noise?????????
 

IAC or vacuum leak. Sometimes the IAC motors just go bad. Does not necessarily indicate another problem. The fact that the RPM is increasing is a good thing. When you hear the IAC screaming and RPM does not increase, you got yourself another problem.

Dave

Re: 525 Efi High Pitch Noise?????????
 

changed iac and that did not solve it. any ideas?

Re: 525 Efi High Pitch Noise?????????
 

heres an idea have someone hook a cds to it !!!! not to be a smart ass but its cheaper then replacing parts and guessing when you replaced the iac where did you set it at????

Re: 525 Efi High Pitch Noise?????????
 

it is at the dealership. It is under warranty. They and mercury racing seem to be having a tuff time figuring it out. They changed the iac and mercury just sent a new o ring set for pleniums. They have had the boat two weeks, my boating summer is ending. I thought maybe someone on here had some idea or had this problem before.

Re: 525 Efi High Pitch Noise?????????
 

fixed, Turned out to be the intake gasket leaking.

Re: 525 Efi High Pitch Noise?????????
 

cool, glad to hear!!!