IAC Muffler

Liberty44140

i watched a how to utube video before I changed my cap and rotor and it showed changing the iac muffler. Never heard of it, but I ordered them anyway. Around $2 each. Wow we’re my old mufflers sure bad. I don’t see where they have been discussed here before. Here are pics of my old and new muffler, also the new muffler installed (they go just under the flame arrestor). Merc 350 Mag Horizons, 2006 

Cableguy Greg

I changed mine last year. The ones that I pulled out were as bad as yours. I am adding that to my spring maintenance. For $2, it's worth it.

Liberty44140

Agree. I read that you can do away with them but you’ll hear the hiss of the iac so that’s not worth it and if they get really really bad they can get sucked in to the iac, definitely worth replacing. I bet mine was 12 yrs old 

Cableguy Greg

Mine was probably original, which would have put it at 10 years old. I would rather have it than not have it.

reneechris14

Yup I'll put it the list thanks guys

GMSLITHO

last year was my first season ith this boat ,the rpms would fluctluate a little at idle speed I changed mine along with the iac and that issue was solved ….luckily a cheap fix  

JonnyM

I changed my IAC last year on my 350 mag and found it is the same as the oem part for a Ford windstar with a 3.8 v6.