All,
I have a 2002 Four Winns Horizon with a 350 Mag MPI (OM254958) and a Bravo 3 drive. The past couple of times we have been out the engine has been hard to start after its been running. So I did some searching on possible causes to see if I could check a couple items and noticed that some people have a check valve in the coolant line to help with vapor lock. I looked in my service book (mercruiser #24) and no where in there is a check valve referenced. I also checked the mercuiser online parts manual and it does not show one for my serial number either. I checked the boat and it does not have the check valve before or after the fuel cooler. Is there a kit number that I can use to install one? I have also had a high pitched whine coming from the throttle body at low rpms. While checking into the hard start, there where several recommendations to clean the throttle body, IAC, and replace the IAC muffler (which it sounds like is the cause of my high pitched whine). I looked in the parts manual to locate it and get a price on a new one and no where does it show the IAC. It shows the throttle body with it installed but not the IAC separately. Is there a reason it is not listed separately? One final questions, while checking the engine I noticed a plug with a purple and black wire on one side and a white wire looped to itself connected to the other end of the plug. I have attached a pic. Any idea what purpose this plug serves and is it supposed to be connected like this?
I have a 2002 Four Winns Horizon with a 350 Mag MPI (OM254958) and a Bravo 3 drive. The past couple of times we have been out the engine has been hard to start after its been running. So I did some searching on possible causes to see if I could check a couple items and noticed that some people have a check valve in the coolant line to help with vapor lock. I looked in my service book (mercruiser #24) and no where in there is a check valve referenced. I also checked the mercuiser online parts manual and it does not show one for my serial number either. I checked the boat and it does not have the check valve before or after the fuel cooler. Is there a kit number that I can use to install one? I have also had a high pitched whine coming from the throttle body at low rpms. While checking into the hard start, there where several recommendations to clean the throttle body, IAC, and replace the IAC muffler (which it sounds like is the cause of my high pitched whine). I looked in the parts manual to locate it and get a price on a new one and no where does it show the IAC. It shows the throttle body with it installed but not the IAC separately. Is there a reason it is not listed separately? One final questions, while checking the engine I noticed a plug with a purple and black wire on one side and a white wire looped to itself connected to the other end of the plug. I have attached a pic. Any idea what purpose this plug serves and is it supposed to be connected like this?
