couple of questions
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This is a discussion on couple of questions within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; i just finished doing a bunch of mods to my car. i'm a little worried about a few things. 1) ...

  1. #1
    Registered User shadowpr's Avatar
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    couple of questions

    i just finished doing a bunch of mods to my car. i'm a little worried about a few things.

    1) how can i see what the cel code is using a tactrix?

    2) what are the symptoms i should look for if i have a intake leak or leak from the manifold?

    3) what syptoms should i look for if have an exhaust leak?

    thanks

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    Moderator Donkey's Avatar
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    1) Use the Learning View program 2)Stumbling/stalling and abnormal fuel trims 3)Exhaust leaks are audible. Also depends if your looking for a preturbo leak or a post turbo leak. Google can explain further.
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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by Donkey
    1) Use the Learning View program
    Just be sure to deselect the "Disable DTC reader" option
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

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    I also believe with exhaust leaks you feel a major loss in power
    -Nick-

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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by The Mechanic
    I also believe with exhaust leaks you feel a major loss in power
    Depends on pre-/post-turbo
    2005 WRX STi (Mods | Virtual Dyno)

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    Ok thanks for lettin me know, Never experienced an exhaust leak with a turboed car. Just N/A ones. There was a big loss in power on those.
    -Nick-

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    Registered User shadowpr's Avatar
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    Quote Originally Posted by Donkey View Post
    1) Use the Learning View program 2)Stumbling/stalling and abnormal fuel trims 3)Exhaust leaks are audible. Also depends if your looking for a preturbo leak or a post turbo leak. Google can explain further.
    cool. i ended up finding the learning view program, and found the cause of the cels.

    when i start the car, it seems to want to stall a bit. still in the process of getting tuned though. hopefull its not a leak.

    what do you mean by abnormal fuel trims?

    i can't hear anything other than the exhaust. i think the connection from on the midpipe (3 piece) is leaking. I saw some water dripping from the connection yesterday.

  9. #8
    Moderator Donkey's Avatar
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    Quote Originally Posted by shadowpr View Post
    .

    what do you mean by abnormal fuel trims?
    A vacuum leak will be post MAF. This will cause a lean condition. The O2 sensor will reflect said lean condition durring closed loop operation and the ECU will adjust injector pulse width to return the fuel mixture to 14.7:1 AFR. This will be present in the "A" and "B" learned fuel trim ranges. Basiclly the fuel trims should be bewteen +/-5%. A vacuum leak will sometimes show itself as a maxout fuel trim range. +14.99% is maxed out added fuel while -14.99 would be maxed out fuel removed.
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    Registered User shadowpr's Avatar
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    Quote Originally Posted by Donkey View Post
    A vacuum leak will be post MAF. This will cause a lean condition. The O2 sensor will reflect said lean condition durring closed loop operation and the ECU will adjust injector pulse width to return the fuel mixture to 14.7:1 AFR. This will be present in the "A" and "B" learned fuel trim ranges. Basiclly the fuel trims should be bewteen +/-5%. A vacuum leak will sometimes show itself as a maxout fuel trim range. +14.99% is maxed out added fuel while -14.99 would be maxed out fuel removed.

    that's a bit over my head. is the A and B learned fuel trims something i can log with romraider? and then see if the min and max values are jumping from -14.99 to 14.99?

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    Moderator Donkey's Avatar
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    Quote Originally Posted by shadowpr View Post
    that's a bit over my head. is the A and B learned fuel trims something i can log with romraider? and then see if the min and max values are jumping from -14.99 to 14.99?
    Learning View will show you your fuel trims.
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  12. #11
    Registered User shadowpr's Avatar
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    Quote Originally Posted by Donkey View Post
    Learning View will show you your fuel trims.
    thank you sir.

    i'll check them later

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