RPM fluctating after muffler delete

Kingadam51Kingadam51 Member Posts: 1
edited November 2018 in Honda
I have a 2018 Civic hatchback sport that I recently did a muffler and resonator delete on. Love the sound but I noticed that when accelerating or deaccelerating I get RPM fluctuations and they can be often sometimes extremely dramatic as far as 400 rpm differencing. Its stable during idle. Why is this happening? I've been reading a lot how others didn't have issues with doing this - does my car need to be tuned? From what I've read on various sites is I don't need back pressure, so what's the deal? Thanks for any help.


  • rickdonrickdon Member Posts: 123
    Maybe the O2 sensors are giving off a varied signal.
  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaMember Posts: 64,482
    You really can't do this and expect the car to run properly--as rickdon says, it's going to throw off your 02 sensors and they will probably be trying to compensate all the time. I would say you're screwing up the fuel trim.

    Despite what you may have read, I'm not buying it. Perhaps some cars are less affected than others, but exhaust systems on modern cars are carefully engineered to work in conjunction with all the other emissions and fuel delivery systems.
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