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Bad Flow - Rough Acceleration

This is a discussion on Bad Flow - Rough Acceleration within the General Help forums, part of the LSx Technical Help Section category; Hello F-bodies, I read quite a few post in this forum regarding the Catalyst Converter and P430 Code. I have ...

  1. #1
    Member matthewaqui's Avatar
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    TA-G8-Expe-L200-Camaro

    Angry Bad Flow - Rough Acceleration

    Hello F-bodies,

    I read quite a few post in this forum regarding the Catalyst Converter and P430 Code. I have the following codes:

    P0119 Generic
    IAT Sensor 1 Circuit
    High Input

    P430 Generic
    Catalyst Efficiency
    Below Threshold
    (Bank 2)

    P430 Generic PD
    Catalyst Efficiency
    Below Threshold
    (Bank 2)

    I have a 2000 Silver Trans Am with 120,700 miles on it. I was hoping that I could keep the vehicle running until next year and upgrade to a 2010 Camaro. Just today I'm experiencing very rough performance on my TA, typically upon startup. When I accelerate, the vehicle slugs and does not fire..... there is very rough idling of sort. This complication was very evident today for it took awhile for the vehicle to get out of this poor performance stage.

    Once the vehicle gets through the sluggish torment, acceleration is alright.

    This problems reminds me of when I forgot to plug in my right side coil wires in after replacing the plugs.

    Would a bad Catalytic Converter cause a back flow and choke ignition causing no acceleration and very rough idle?

    Any suggestions would be greatly appreciative.

    Matthew

  2. #2
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Bad Cats can cause a lot of problems... If you have to have them get new ones(emissions bullcrap).. if not.. get rid of them and turn the code off(via a tune). and your IAT sensor probably just needs to be replaced... Simply fix..

  3. #3
    Member matthewaqui's Avatar
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    Thumbs up Probably Correct.....

    Thanks for the word Josh...... as I was idling in drive..... I seem to here a low rattle from beneath, thinking the Driver side cat is bad inside. I'm in California and will need those Cats.... thanks for the advice buddy.

    I have heard other experiencing the acceleration stumble that I have had, though there has been no advice posted...

    Matt

    Quote Originally Posted by JoshieDoom View Post
    Bad Cats can cause a lot of problems... If you have to have them get new ones(emissions bullcrap).. if not.. get rid of them and turn the code off(via a tune). and your IAT sensor probably just needs to be replaced... Simply fix..

  4. #4
    Member matthewaqui's Avatar
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    Thumbs up Service is Underway

    Well Josh,

    I called GM and they will replace the cats for me at no charge. I'm over the 120,000 miles warranty at 120,800 but explained I bought the vehicle used 110,000.

    I think that is the problem of some backflow restrictions causing all sort of bad performance.

    Once again, thanks man!
    Matthew

    Quote Originally Posted by JoshieDoom View Post
    Bad Cats can cause a lot of problems... If you have to have them get new ones(emissions bullcrap).. if not.. get rid of them and turn the code off(via a tune). and your IAT sensor probably just needs to be replaced... Simply fix..

  5. #5
    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Cool. If the dealer will do it for free that is always the way to go.

  6. #6
    Member matthewaqui's Avatar
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    Thumbs up High Numbers----------

    Hey man,

    Some on here also mentioned to me that the PCV may be clogged giving off the 430 code... you may want to keep that in mind for the fture since I noticed you have high numbers like me 150,000

    Matthew
    Quote Originally Posted by JoshieDoom View Post
    Cool. If the dealer will do it for free that is always the way to go.

  7. #7
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    I drive the M6 and have same problem except for I have no cats anyway. I was always wondering about this. Most of the time mine happens is after a really rough storm and it gets wet underneath. Strange to me.

  8. #8
    Member matthewaqui's Avatar
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    Thumbs up Other Diagnose.

    You luckout on this thread......... I have been advise to replace the IAT, the ECT and PCV Valve. That could possibly be our problem. The replacement to these parts are not very expensive.

    Check these threads out to get a better understanding...... we seem to experience similar problems:


    Seafoam, GM Bulletin, Last Year, Catalytic

    PCV Valve Question

    Quote Originally Posted by thopsramair View Post
    I drive the M6 and have same problem except for I have no cats anyway. I was always wondering about this. Most of the time mine happens is after a really rough storm and it gets wet underneath. Strange to me.

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