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Help!!!!

This is a discussion on Help!!!! within the General Help forums, part of the LSx Technical Help Section category; Alright... im getting P0405... EGR Voltage in circuit too low.. etc etc... Should I replace my EGR valve?? But i ...

  1. #1
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Exclamation Help!!!!

    Alright... im getting
    P0405... EGR Voltage in circuit too low.. etc etc... Should I replace my EGR valve??

    But i have my cats removed and/or gutted and im getting p0420/p0430 due to no rear 02 sensor.. could the cats have something to do with the EGR system because I do know that in my truck and other vehicles when you remove the cat it throws egr codes due to not enough backpressure.

  2. #2
    Senior Member 35thAnniZ28's Avatar
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    Mar 2007
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    eating bulldog
    son of biscuit

    get a tune,get it all removed(air,egr,rear sensors) and call it a day...

  3. #3
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    I've had luck cleaning EGR valves in the past but not on my LS1. I pulled mine off a long time ago and placed it in the trash. Might try pulling it and cleaning the carbon around the pintle and that *may* cure your problems. My wife used to have a 94 blazer that I would pull and clean at least once a year.

  4. #4
    Senior Member 35thAnniZ28's Avatar
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    eating bulldog
    son of biscuit

    its a known fact that egr valves are bitch to clean

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