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    Running rich on driver's side only

    I've been getting really bad gas mileage in my sixxer... I'm talking in the single-digits. So, I took out all my spark plugs... and, well... I'm fvcking confused:



    The spark plugs are in order of how I took them out. So the ones on the left is the passanger side, the ones on the right is the driver's side.




    Obviously something is wrong. My question is: do I have to take it to a shop to fix it?


    [P.S. This is a '98 V6 Mustang]



    EDIT:: I also get random 'Check Engine Light' warnings. They come and go. It seems really arbitrary.



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    Re: Running rich on driver's side only

    O2 problem



    refs
    woc47, nigro013, defconx3, louisiana_crx, bld 25, supa_c, lancer1978, sxkicker89, 310w6, more, i forget

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    Re: Running rich on driver's side only

    Quote Originally Posted by jdawg View Post
    O2 problem

    On only 1 side?



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    Re: Running rich on driver's side only

    you should have 3 or 4 O2's id one is stuck it could run one side lean



    refs
    woc47, nigro013, defconx3, louisiana_crx, bld 25, supa_c, lancer1978, sxkicker89, 310w6, more, i forget

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    Re: Running rich on driver's side only

    Quote Originally Posted by jdawg View Post
    you should have 3 or 4 O2's id one is stuck it could run one side lean

    Oh


    Any way to tell which one? Or no?



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    Re: Running rich on driver's side only

    usaully it will set your CEL but go to autostoned and see if there is a code. There should be 1 O2 sensor on each downpipe and 1 after your cat. Not posotive cause Im not a Ford tech. But get it checked sounds like an O2 problem to me.



    refs
    woc47, nigro013, defconx3, louisiana_crx, bld 25, supa_c, lancer1978, sxkicker89, 310w6, more, i forget

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    Re: Running rich on driver's side only

    Quote Originally Posted by jdawg View Post
    usaully it will set your CEL but go to autostoned and see if there is a code. There should be 1 O2 sensor on each downpipe and 1 after your cat. Not posotive cause Im not a Ford tech. But get it checked sounds like an O2 problem to me.

    I've always heard those places will hook up to your car for free-- but, I don't even know how to begin to ask. Do I just walk up and ask if they'll scan my car for me?



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    Re: Running rich on driver's side only

    yea just ask them if they can sheck your codes. usaully whichever bank is rich/lean your O2 is malfunctioning on that side. I would but a factory O2 also.



    refs
    woc47, nigro013, defconx3, louisiana_crx, bld 25, supa_c, lancer1978, sxkicker89, 310w6, more, i forget

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    Re: Running rich on driver's side only

    If you've had the car more than a couple years, and you've never done them, then do them anyways. There's a way to test them, but it's not really worth it, if they're more than a couple years old. Also, be very gentle with the new ones. They have a porcelain element inside them, and if you drop them, it could very easily trash them. The Essex V6, had 3 O2 sensors, in most cases, 2 pre-cat, 1 post-cat. Cali cars have 2 pre, 2 post.




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    Re: Running rich on driver's side only

    similar issue, replaced O2 sensor and PCV valve, try those first.




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    Re: Running rich on driver's side only

    Most auto parts stores will check codes for free, just ask. They provide that service, so they can sell you the parts you need to fix it...




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    Re: Running rich on driver's side only

    So I took my car to Advanced Autoparts today to run the codes.

    I got P1151 and P0174
    Aparently it's running lean, not rich?

    Anyway... What do I replace? The guy at Advanced Autoparts said MAF and O2. But, according to these codes, only the O2 is bad? Any help?



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    Re: Running rich on driver's side only

    MAF can be cleaned... o2's should be changed.




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    Re: Running rich on driver's side only

    Quote Originally Posted by Zakerid View Post
    MAF can be cleaned... o2's should be changed.
    How can you clean them?



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    Re: Running rich on driver's side only

    Have someone scan for codes.




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