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MPH go up when i rev while stopped, out of gear M6

This is a discussion on MPH go up when i rev while stopped, out of gear M6 within the General Help forums, part of the LSx Technical Help Section category; so my car started sounding funny today, i have LT stock cat back and a electric cut out. when i ...

  1. #1
    Member ApexVIII's Avatar
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    Red
    1998 Camaro Z28

    Question Strange exhaust sound, whith electric cut out open

    so my car started sounding funny today, i have LT stock cat back and a electric cut out.

    when i go WOT the tires dont break loose as fast as they have been the exhaust seems to not be as loud, and has alot more rasp to it

    like there is a exhaust leak, but when i shut the cut out there is no exhaust leak to be found. there also is a squeak that happens right be for red line at WOT
    any ideas?

    scanned it here are the codes... my SES light has been on ever sence i bought the car lol its not tuned for the headers..

    but

    P0153
    P0133
    P0134
    P1133
    P1153
    Last edited by ApexVIII; 03-20-2008 at 01:57 PM.

  2. #2
    rsg98Z28 rsg98Z28's Avatar
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    Black
    1998 Camaro Z28 vert

    dont worry about the mph gauge my car does it too and i also have afreind with a 98 1500 his does the same thing as for the rest i will have to give some thought

  3. #3
    Senior Member Tyler_LS1's Avatar
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    Pewter
    1999 Camaro SS-M6 #1775

    My Camaro doesn't do it but my Chevy K2500 does..

    I dont think its a problem, it accurate according to GPS
    1999 Camaro SS/ Pewter/ #1775 - LS1 6-speed - Predator 3 Custom Tune - Pro 5.0 - LS7 Clutch - 3.90's - Koni's - Strano Springs and Sway Bars - SFC's - Full UMI Chassis and Suspension - LS6 Intake PnP TB - ARH LT's and Kitty Ran Away - Magnaflow.

    12.6 at 112

    http://www.fquick.com/Tyler_LS1

  4. #4
    Member ApexVIII's Avatar
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    1998 Camaro Z28

    Quote Originally Posted by Tyler_LS1 View Post
    My Camaro doesn't do it but my Chevy K2500 does..

    I dont think its a problem, it accurate according to GPS
    oh lol ok thats good to know

    Thanks alot guys,

    i wonder why my car started making the weird sounds hmm ill have to scan it and see if there is anything

  5. #5
    Veteran 0rion's Avatar
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    06 duramax

    any unusual ticks? Could be an exhaust leak that's not showing itself until you go WOT. How many miles on your O2 sensors? Notice an unusual amount of soot in the exhaust tips? Just ideas. It could be a ton of things. Start simple and cheap.

  6. #6
    Member ApexVIII's Avatar
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    1998 Camaro Z28

    Quote Originally Posted by 0rion View Post
    any unusual ticks? Could be an exhaust leak that's not showing itself until you go WOT. How many miles on your O2 sensors? Notice an unusual amount of soot in the exhaust tips? Just ideas. It could be a ton of things. Start simple and cheap.
    yea, lol the rear two o2's are not even there lol they are bypassed.

    i replaced the passesngers side one about 2k miles ago. but the odd think that makes me think its not a exhaust leak even though it really sounds like one is,
    that it sounds bone stock with the cut out shut then when i open it thats when i hear the raspy/exhaust leak sound. the car does also feel weaker too.

    not really any weird noises other then the squeak at WOT and the exhaust noise

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