Josh Leverington

I am experiencing a very pulsey exhaust note. car pulls hard still n runs full boost, but my exhaust note sounds like i have lost a piston. I did a compression check aswell as change all four spark plugs, everything is ok. but, my exhaust sounds very interrupted almost like a STI subaru any thoughts?

09blackonblack

iTrader: (1)

subd i have the same issue and was getting ready to post... i have the same issue along with when i go to shift my rpms float for awhile then drop. ie if i shift at 3k they will stay there for about 5 seconds then slowly drop.

cubaniche

iTrader: (1)

Well, not saying this is your issue, but I had the same problem. Thing is, I got a missfire CEL about a day later. I could definitely tell there was a change from my normal hummmm to the subaru sound. Turns out I had a crack on the middle ringland on piston #4. Never did a compression check because I was ready to swap them out anyways, so I dont know if it still had proper compression or not. It ran fine and pulled hard is all I can say. Good luck!

YelloEye

iTrader: (3)

Curious.

09blackonblack

iTrader: (1)

hope i dont have a busted ringland in mine i have a ko4 swapped 2.2 and warranty wont cover that

my issue started after i blew the charge pipe off the other day

Josh Leverington

The compression test showed bang on 150psi across all 4 piston as far as rings land they should be ok?

cubaniche

iTrader: (1)

Well thats the thing. I never tested compression so I dont know if it dropped.
I will say this, a friend with the same issue on his TC showed good compression on all four cylinders and the dealer didnt know one of the pistons was fried until the third leak down test. THATS when they noticed an issue and turned out to be a bad ringland on his number 1 piston.

Im not aware of any other issues that would cause the exhaust note to change in that way other than a bad piston or a missfire.