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Emission test after battery change

Discussion in '348/355' started by hameednoor, Sep 29, 2010.

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  1. hameednoor

    hameednoor Rookie

    Jun 4, 2010
    21
    #1 hameednoor, Sep 29, 2010
    Changed battery and then went for emission test on my 1997 F355. HC failed. I hear that you need to drive / start a number of times to reset codes before it would pass. Is that correct and if so how much should I drive.
     
  2. Kaivball

    Kaivball Three Time F1 World Champ
    Owner

    Jan 11, 2007
    35,997
    Kalifornia
    #2 Kaivball, Sep 29, 2010
    Disconnect.

    Reconnect.

    Turn off A/C, radio etc.

    Re-start and let idle until fans kick in.


    Go and get your emission test.

    This should let the ECU relearn the parameters of your car.

    I'd also take the car to emissions after it's been warmed up.

    Kai
     
  3. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,044
    USA
    #3 f355spider, Sep 29, 2010
    Changing the battery will not reset the P codes or settings for a emmission check through the OBDII port. It sounds like you got a "sniffer" test at the tail pipe if they are saying your HC is too high. You may have a "miss" in the ignition or something that is causing that. You may want a specialist to look at your car more closely.
     
  4. hameednoor

    hameednoor Rookie

    Jun 4, 2010
    21
    #4 hameednoor, Oct 10, 2010
    Ran a test for codes and the mechanic said everything was fine. Changed all the spark plugs and passed the emission test. I also requested for a compression test and the results are strange. 175 in all the cylinders except 2 and 7. They both came out at 25. After a wet test, one of them climbed to 90 and the other stayed at 25.

    However all the missing and roughness has disappeared and the change of spark plugs has had a phenomenal improvement in drivability.

    Am I looking at an error or $$$$. If the two cylinders are actually as bad as is claimed, can I continue driving the car, assuming I am happy with the level of performance. I am just a regular street driver.

    On another note, all the gears pull well except there seems to be some hesitation or slippage after 4000 rpm only on the 4th. 3rd and 5th seem fine.

    Cheers
     

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