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no muffler = service engine soon?

This is a discussion on no muffler = service engine soon? within the External Engine forums, part of the LSx Technical Help Section category; can cutting off a muffler make the Service Engine Soon light come on ?...

  1. #1
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    1999 T/A

    no muffler = service engine soon?

    can cutting off a muffler make the Service Engine Soon light come on
    ?

  2. #2
    Life in the Fast lane sunsetorangess's Avatar
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    Nope
    If your throwing codes have them read and then post if this is for reference than you should be good
    J
    2001 SS, Its not the car its the Driver that matters....

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    Feels so good BadBlueBird*'s Avatar
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    still got cats?

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    Ricekiller z28punk's Avatar
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    there are no sensors by the muffler. the last ones are right behind the cats

  5. #5
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    i keep hearing that a change of back pressure might cause that to happen.

    not only that some things happened that might explain this.

    I cut of the muffler and a few days later the light came on. I reset the cpu and no problems for a month. then i put the muffler back on. still no light and everythings ok. I cut the muffler off for the second time and a wek later the light is on......so i reset the cpu and hopefully it wont go back on. the scanner at autozone said its a emissions problem so...........

  6. #6
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    When I run my cutout open (just before the muffler) it's never thrown a code. The actual code the car is throwing will tell you what's going on.

  7. #7
    Member jmhvenom's Avatar
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    Loss of back pressure could throw the A/F ratio, but I dont see removed the muffler changing this enough if you still have full piping.

  8. #8
    Senior Member 02z28ls1's Avatar
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    Decreasing backpressure could lean out the A/F ratio enough to throw that code (it has been known to happen with header installs for example). Computer might be able to compensate and quit throwing codes. Need to know what code we are talking about to give a better answer.

  9. #9
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    If you can post the code we can help you find the root cause. Right now all anyone can do is speculate. Best of luck

  10. #10
    Senior Member mrr23's Avatar
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    Quote Originally Posted by via sin dios View Post
    can cutting off a muffler make the Service Engine Soon light come on
    ?
    no.

  11. #11
    Senior Member SeVeReDiStOrTiOn's Avatar
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    Quote Originally Posted by via sin dios View Post
    i keep hearing that a change of back pressure might cause that to happen.

    not only that some things happened that might explain this.

    I cut of the muffler and a few days later the light came on. I reset the cpu and no problems for a month. then i put the muffler back on. still no light and everythings ok. I cut the muffler off for the second time and a wek later the light is on......so i reset the cpu and hopefully it wont go back on. the scanner at autozone said its a emissions problem so...........
    Well there you go..what was the code

  12. #12
    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by via sin dios View Post
    can cutting off a muffler make the Service Engine Soon light come on
    ?
    Negative
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