Puzzling problem!! Weigh in w your knowledge!

Discussion in 'Mazdaspeed 3 General Discussion' started by captaingeoff, Jul 15, 2017.

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  1. captaingeoff

    captaingeoff Greenie N00B Member

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    2010 Mazdaspeed3. 88k miles. Getting intermittent P0171 code, lean bank. Have replaced plugs (Ngk perfectly gapped), coil packs, cam and crank posit sensors, MAF sensor, and even the upstream O2/AF mix sensor. Still getting code. Occasionally. Totally random. 10 miles. 30 miles driving. Sometimes a block after I clear it. Car has very minor 'miss' or slight hesitation that most ppl don't even notice, only really good car guys notice when in passenger seat. So frustrated. ECU? Fuel pump? Injectors? Anyone had this problem? Do tell!
    Thank you. Cheers, mates. Geoff


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    captaingeoff, via a mobile device, Jul 15, 2017
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  2. djohns

    djohns Silver Member

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    Any logs? What are plugs gapped at? Mods?
     
    djohns, via an iPhone, Jul 15, 2017
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  3. monkey.bones.007

    monkey.bones.007 Platinum Member

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    Injector seals. That's my guess.

    crapatalk it sucks for free
     
    monkey.bones.007, via a mobile device, Jul 15, 2017
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  4. 5doorsoffury

    5doorsoffury Greenie Member

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    Vacume leak? I see no diagnosis described. What mods do you have? Logs?
     
    5doorsoffury, via a mobile device, Jul 15, 2017
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  5. Littleloogy

    Littleloogy Recovering Speed Addict Platinum Member

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    My guess would be and exhaust leak of some sort before the primary O2 sensor.

    Modification list?


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    Littleloogy, via a mobile device, Jul 15, 2017
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  6. captaingeoff

    captaingeoff Greenie N00B Member

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    captaingeoff, via a mobile device, Jul 15, 2017
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  7. captaingeoff

    captaingeoff Greenie N00B Member

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    No mods. No logs. Too irregular to b a vacuum leak. Gives P0171 code once every 1-100 miles, then clears ok. Over and over.


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    captaingeoff, via a mobile device, Jul 15, 2017
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  8. captaingeoff

    captaingeoff Greenie N00B Member

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    No mods


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    captaingeoff, via a mobile device, Jul 15, 2017
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  9. VoodooJef

    VoodooJef Silver Member

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    Just for giggles, check the recirc hose from the bypass valve. Humor me, if you will.
     
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  10. Littleloogy

    Littleloogy Recovering Speed Addict Platinum Member

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    Could be the EGR valve being stuck open as well. Have you ever cleaned it? If not, @Raider made a nice write-up on how to clean the valve. Good preventive maintenance.

    Best to start with a boost leak test and go from there. That's where I would start.
     
    Littleloogy, via an iPad, Jul 15, 2017
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  11. 2012FailWheelDrive

    2012FailWheelDrive Greenie N00B Member

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    Check pcv valve and hoses

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    2012FailWheelDrive, via a mobile device, Jul 16, 2017
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  12. captaingeoff

    captaingeoff Greenie N00B Member

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    No vacuum leaks. No mods. Newly installed OEM upstream O2/AF sensor was bad, it seems. Got it warrantied by dealer, reinstalled new one, no problems, yet. 300 miles and counting.....


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    captaingeoff, via a mobile device, Jul 20, 2017
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  13. captaingeoff

    captaingeoff Greenie N00B Member

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    When I bought the car 6 mos, and 4-5k miles ago, I pulled off intake manifold, EGR valve and hard pipe, walnut shell blasted the intake valves (pain in the ass, but worked great) and the EGR pipe and valve, installed an oil catch can, and put it all back together. No leaks, so don't ask.


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    captaingeoff, via a mobile device, Jul 20, 2017
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  14. Littleloogy

    Littleloogy Recovering Speed Addict Platinum Member

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    So, what is it? These statements contradict themselves. How can you have no mods, but also a catch can? You have me confused.


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    Littleloogy, via a mobile device, Jul 20, 2017
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  15. neganox

    neganox Feline Führer Moderator Platinum Member

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    That sucks. Great that was the issue and you didn't have to muck around with injectors/seals.
     
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