jps

does any know if a dirty iac muffler will throw a iac code on computer thanks

lakematdude

Yes it has done so in the past.

What engine model?

jps

496 mag ho 2007

BUP

iTrader: (9)

If your 496 is a NON DTS model then you will have an IAC muffler. I have seen a few of these throw a code plus can or will make an engine run rough at idle and just off idle if they are very very dirty or injested into the cavity along with dirt. I am talking about the IAC muffler besides the IAC itself. It seems as when the IAC muffler is not in place (missing) on the 496 you will get a surging idle and a louder hissing noise.

jps

thanks for input i finally swapped ecm"s problem moved to the other motor trying to figure out what to do

BUP

iTrader: (9)

Check your connections into the problem PCM, check for corrosion issues, next have your PCM checked out by Merc or Dustin Whipple. Next steep if a new PCM is needed you have to fix the cause of what damaged your PCM. Some things are bad grounds, corrosion issues, bad or faulty IAC, bad coil (s), voltage spikes (connection issues)

jps

ended up the bad iac burnt up pcm also had the iac muffler compressed to much and throwing iac code

Keith Atlanta

I havent had mufflers (sponge) in mine for 5+ years and they never threw a code.