I found a post from someone about the same problem I was having. <br /><br />Turned out to be his exhaust flappers.<br /><br />I pulled mine apart tonight and found one of them was disconnected from the rod and it fell down into the tube.<br /><br />Finally got it out and now I just need new gaskets then I should be up and running. <br /><br />I still plan on checking the antisiphon valve cause it won't hurt to make sure it's clear.<br /><br />I saw a post that said that Volvo recommends removing the flappers all together. My boat is an I/O so I have the higher risers but I am worried about water getting back into the engine and ruining it.<br /><br />Anyone else heard of this service bulletin?
