need help!! car is running so slow and check engine light is flashing, hardly boostin
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This is a discussion on need help!! car is running so slow and check engine light is flashing, hardly boostin within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; a few days ago my car was running fine and rippin running 21 pounds of boost, then check engine light ...

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    Registered User CG boostin WRX's Avatar
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    need help!! car is running so slow and check engine light is flashing, hardly boostin

    a few days ago my car was running fine and rippin running 21 pounds of boost, then check engine light flashed and stayed on and it was hittin fuel cut or back firing its hardly running 7 psi now... and is slow. i need help. taken it to shops but they dont know what is wrong with it because it has too many mods i guess.. can someone please help, pleaseeeeee. check engine light is flashing the whole time i drive now and if i give it full throttle it will back fire. ive checked most lines, and spark plugs. i did install boost gauge and other gauges the night it stopped working, but the boost is the only one that is fully installed. any suggestions? thank you

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    Moderator rage-wrx's Avatar
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    More info is needed to provide any adequate help.

    Check out ***How to Ask a Technical Question!**
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    Ooh,hang on. That is the throb of a turbocharged flat four engine. A sound which,all over the world,heralds the imminent arrival of a moron - JC.

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    Registered User jd92677's Avatar
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    What is the stored code. That would, at the very least, give you a place to start. Right now there is now way anyone can even attempt to give you a direction.
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    Admiral Ackbar the 1st mycologist's Avatar
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    I'll take a wild guess at the front o2 sensor.

    You definately need to get the CEL code read - usually free at Autozone. Get the actual number for the code - "P0..."

    Your ECU put your car in "limp home mode" most likely, because there is a serious issue. It is trying to tell you to quit driving it until it is fixed - you should listen to it.

    As much information you can provide about the modifications would help us help you. How was it tuned or how is the boost so high (21). What guages and how were they wired - any chance you disturbed the sensor wires etc.
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    Registered User CG boostin WRX's Avatar
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    Quote Originally Posted by mycologist View Post
    I'll take a wild guess at the front o2 sensor.

    You definately need to get the CEL code read - usually free at Autozone. Get the actual number for the code - "P0..."

    Your ECU put your car in "limp home mode" most likely, because there is a serious issue. It is trying to tell you to quit driving it until it is fixed - you should listen to it.

    As much information you can provide about the modifications would help us help you. How was it tuned or how is the boost so high (21). What guages and how were they wired - any chance you disturbed the sensor wires etc.
    i took it to 3 different places.. they couldnt read my codes????? they are dumb.. the connection might be messed up to the code reader.. but checked it and seemed all wires were good
    04 wrx modded & audi a4 b5

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    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by CG boostin WRX View Post
    i took it to 3 different places.. they couldnt read my codes????? they are dumb.. the connection might be messed up to the code reader.. but checked it and seemed all wires were good
    I was also going to suggest that you are taking it to the wrong people.

    Maybe if you can find a good tuner that knows WRX's they could just sort it out for you, but if you provide the information we might have a chance.
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    zax
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    First off you have neglected to include critical information including the model/year of car and modifications. For example, a stock 2L WRX should NOT be running 21 PSI of boost.
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    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by zax View Post
    First off you have neglected to include critical information including the model/year of car and modifications. For example, a stock 2L WRX should NOT be running 21 PSI of boost.
    The new gauge probably reads high. I don't think that is what a log would show.

    Notwithstanding that Ron was doing it in the midrange with a p&p td04, I agree with the advise that 18 would be a much better bet for us normal folks.

    Edit: oh you said stock, sounds like it isn't but still waiting for the details.
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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by mycologist
    Notwithstanding that Ron was doing it in the midrange with a p&p td04, I agree with the advise that 18 would be a much better bet for us normal folks.
    That depends on the cooling available. Considering that 18-19 PSI is fine/common on a StageII tune with the TD04, and 20-22 PSI is still not outside the efficiency range, with a quality TMIC (better cooling / less pressure drop), 21-22 PSI isn't all that aggressive. Obviously, this is dependent on timing/fueling, but you get the idea...
    Last edited by EJ257; 07-19-2012 at 07:35 PM.
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    Admiral Ackbar the 1st mycologist's Avatar
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    Yeah I need a TMIC.
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    zax
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    None of those examples is stock. The surge line for a TD04-13t PnP is 24PSI IIRC. Well above what the internals will likely handle.

    Edit: yikes I meant to say the surge line is 24 PSI at a standard 1atm ambient pressure. That's a 1.6 press ratio
    Last edited by zax; 07-19-2012 at 07:51 PM.
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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by zax
    None of those examples is stock. The surge line for a TD04-13t PnP is 24PSI IIRC. Well above what the internals will likely handle.

    Edit: yikes I meant to say the surge line is 24 PSI at a standard 1atm ambient pressure. That's a 1.6 press ratio
    Been a while since I looked at a compressor map, but 24 PSI on meth/E isn't unheard of.
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    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by zax View Post
    None of those examples is stock. The surge line for a TD04-13t PnP is 24PSI IIRC. Well above what the internals will likely handle.

    Edit: yikes I meant to say the surge line is 24 PSI at a standard 1atm ambient pressure. That's a 1.6 press ratio
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    So actually 21 psi isn't completely unreasonable, although not a great TMIC.
    "From a little spark may burst a mighty flame." - Dante
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