1. #1
    Wilbur1035's Avatar
    Wilbur1035 is offline Junior Member
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    Got 4 OBD II Error Codes Right Now

    P0174; Fuel System 2/1 Lean. What the hell does that mean? Do I need to see a mechanic or can I diagnose and repair. I have better than a modicum of ability, just mostly old school stuff so I'm sometimes baffled with all of this computer controlled minutiae.
    P0579; Speed Control Switch 1 Performance. So stop using cruise control? Will it prevent me from passing CA smog?
    P0457; Evap System - Loose Fuel Cap. No it's not.
    P0456; Evap System Small Leak. Good Lord, this could be anywhere? Most common starting points? Are people going to say, "Start at the mechanic"? Because I am close to doing that anyway but I want to save money to put back into my rig as upgrades, not to buy my mechanic a steak dinner at Ruth Chris.

    Any assistance is appreciated, even if it's directions to another thread regarding the topics.

  2. #2
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
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    Got 4 OBD II Error Codes Right Now

    Model and year please!
    Ooo steak and there is a Ruth Chris in Cincinnati. Yumm!
    I like medium rare. Thank you!


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    Last edited by JPNinPA; 06-19-2019 at 09:05 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

  3. #3
    JPNinPA's Avatar
    JPNinPA is offline Senior Member
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    Got 4 OBD II Error Codes Right Now

    Did you replace the gas cap? If so did you reset the codes?
    Is the idle above 750 rpm?
    HVAC only blow out defrosters?



    Check these vac lines.
    https://youtu.be/CbEMURzbHNc

    While idling spray WD40 or injector cleaner around the vac lines listening for a change in rpm or stutter. Then at the intake near each cylinder to head. Leak is likely in the back three cylinders. On TJs the last #6 exhaust intake bolt is known to loosen. Or you may have a partially clogged injector with the vac leak.

    Sent from my iPhone using Jeepz.com mobile app
    Last edited by JPNinPA; 06-19-2019 at 09:08 PM.
    "Never look down on anybody unless you're helping him up" - Jesse Jackson

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