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Thread: NEED HELP! Codes:P0171, P0174, P0304, Symptoms inside

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  1. 01/12/2009, 12:00 PM #1
    Jolly Roger VX'er's Avatar
    Jolly Roger VX'er
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    Just found some relevant threads in case you didn't already see them:

    http://www.vehicross.info/forums/sho...&highlight=maf

    http://www.vehicross.info/forums/sho...ight=high+idle

    http://www.vehicross.info/forums/sho...&highlight=maf

    http://www.vehicross.info/forums/sho...highlight=idle

    http://www.vehicross.info/forums/sho...highlight=idle

    http://www.vehicross.info/forums/sho...highlight=idle

    http://www.vehicross.info/forums/sho...highlight=idle

    http://www.vehicross.info/forums/sho...highlight=idle

    http://www.vehicross.info/forums/sho...highlight=idle

    http://www.vehicross.info/forums/sho...highlight=idle
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  2. 01/12/2009, 04:54 PM #2
    taylorRichie
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    Thankya thankya thankya...

    Looks like the IAC is going to be the culprit... as corroborated by the man links you sent...

    Most people on here have referred to it as the Idle Control Valve, or ICV which is probably why my searches for IAC didn't come up. But your searches for IDLE showed a lot...

    I'm going to go disconnect my battery for 30 minutes to get a fresh restart (apparently needed after messing with the IAC) and then if the issue persists (expected) then I'll pick up an IAC, Part#8-17112-648-0 (for anyone's future reference)
    Last edited by taylorRichie : 01/14/2009 at 03:12 PM Reason: Wrong P/N
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  3. 01/12/2009, 05:28 PM #3
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    Exclamation Correction!

    Richie, I was wrong, my scanguage does indeed show a reading for the TPS!!!!

    Bart
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  4. 01/12/2009, 05:39 PM #4
    taylorRichie
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    uh oh... I guess I better reset my computer (disconnect battery) and then check the scanguage again...

    Man it'd be nice to own the tech 2 tool...

    Thanks Bart!

    I'll keep everyone posted on my findings, I'm sure you're all on the edge of your seats.
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  5. 01/13/2009, 09:22 AM #5
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    nfpgasmask
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    Quote Originally Posted by taylorRichie View Post
    uh oh... I guess I better reset my computer (disconnect battery) and then check the scanguage again...

    Man it'd be nice to own the tech 2 tool...
    Thanks Bart!
    What kind of scanguage do you have? Is it like mine?



    What is the "tech 2" tool?

    Bart
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  6. 01/13/2009, 05:00 PM #6
    taylorRichie
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    Yeah I have the same scangauge...

    And the TECH 2 tool is the $3,500 tool mechanics can plug into your car and get tons of information, reset sensors, ran diagnostics, manually adjust solenoids etc. So they can make sure they're functioning, etc. etc. etc. The CD Manual has full routines for trouble shooting specific issues, and checking if different components are faulty.

    We basically guess based on symptoms where the tech 2 can verify the condition of a lot of components without even popping the hood. ie full control over the IAC, they can say adjust to 30% (or whatever) and if it doesn't work, they know it's bad.
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  7. 01/16/2009, 08:04 AM #7
    taylorRichie
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    Replaced the IAC, and Disconnected, my TPS, then started the car, shut down, plugged it back in after codes were thrown, plugged it back in, and now my TPS is reading on my Scan Gauge.

    Also my IAC fixed my issues, with one caveat... My Idle is only low when it's in gear?? The vehicle acts completely normal when in Reverse or any forward gear, but when I put it in park it goes to 2,000 RPM.

    My stopped in gear RPMs are about 850, before they were like 1500-2000 and trying to powerbrake. But not anymore.

    Any ideas on what would cause an increase in IDLE but only in Park and Neutral?

    I'm getting no codes so far (15 miles or so).

    So far here's my repair list:
    Cleaned MAF
    Cleaned EGR
    Replaced IAC
    Replaced all Plugs and properly gapped them
    Replaced Fuel Filter
    Replaced PCV
    Checked all hoses for vacuum leaks (found and fixed one small one, actually not even sure it was able to suck air, but there was definitely a small tear near a hose connection)

    Verified all coil packs with an Ohm Meter.

    ?????
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