2010 XF petrol 3.0 P171 and P174 issue, pulling my hair out now
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  1. #1
    Rods 'n' Sods Junkie geof's Avatar
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    2010 XF petrol 3.0 P171 and P174 issue, pulling my hair out now

    My wife’s daily drive has been giving problems for a while now, and as it’s failing all the time and the MOT is due I thought it time to fix it, how difficult can it be, bug...r me, it’s a pain in the rear end. I posted this on the jag forum with out joy.

    This is now stupid :-)

    For the last few months I’ve had both codes, so the time has come to resolve it, so far no joy, what have I done so far, the car also has a poor idle and has got worse from year one. No other error codes. Jaguar looked at the car 3 times over the years to find the poor idle and failed. It’s now at the point it needs fixing.

    changed the maf
    checked for vacuum leak, used smoke and pressure No leaks detacted
    striped the manifold off and replaces the O rings around the pvc vacuum pipes
    all cleaned and reassembled
    cleared faults, disconnected he battery, after five mins both codes back

    the car runs on LPG and petrol, I get the fault on both fuels, it runs 5% petrol while on gas.

    Smoke tested again, nothing,

    ok, mainfold off again and bit the bullet and removed the Lower manifold as well, it’s very messy, but the seals are good. Hope so as no smoke leak.

    All ideas welcome, still in a thousand pieces, so anything else to check before putting the manifolds back together.

    The bit that’s confusing me is both code, left and right bank lean, yet maf and vacuum seem ok. There is one other sensor in the inlet the map, is this next..

    Thankyou for looking.
    I just need this done so I can move back onto my pop.

    Geoff

    smoke pot worked well..
    Last edited by geof; 14-04-2019 at 18:13.
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  3. #2
    Official RnS Addict MYTHING's Avatar
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    The codes for both banks being lean would indicate a sticking EGR valve, its letting in exhaust gas all the time, its only supposed to let it in when first started to firstly burn the rich/choke mixture and secondly to get heat in the engine and cat so it works quicker and reduces emissions

    Had this on the wife's Maverick with a Ford V6 in it, so removed the EGR valve and cleaned it twice with EGR spray cleaner, the first time it was OK for about 2 days after a second clean its been good

    Also changed a valve/sensor called a DPFE sensor it senses the difference between two pressure pipes one from the EGR and one from the manifold so the computer knows when the EGR is open and closed

    The DPFE sensor was listed at £190.00 and not available as an aftermarket item, got one from overseas for £9.99 inc postage and it improved things but was still a sticking EGR valve




    Last edited by MYTHING; 14-04-2019 at 22:30.
    IT'S NOT GETTING WHAT YOU WANT...IT'S WANTING WHAT YOUVE GOT
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  4. #3
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    As the engine is basically a Ford Duratec, check the PCV valve, known problem on those engines.
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  6. #4
    Rods 'n' Sods Junkie geof's Avatar
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    Interesting, thanks, don’t think mine has a egr as it’s the petrol version and don’t think it was fitted, also can’t find one :-)
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  7. #5
    Rods 'n' Sods Junkie geof's Avatar
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    PCV, thats very interesting, it’s well messy, had not thought of that at all, new one ordered.

    Thanks
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  8. #6
    Rods 'n' Sods Junkie geof's Avatar
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    STFT still all over the place.

    Still getting p0171 and p0174 STFT jumping around and hitting 20% on throttle blips

    So,
    Pcv replaced
    Maf replaces
    Manifold off and all vacuum tubes tested
    Smoke tested under pressure no leaks

    What next.
    There is a map sensor at the back of the manifold, don’t understand this enough yet
    While I dismissed the idea that both upstream o2 sensors have failed, maybe they do have something to do with it, the idle has slowly been getting worse over the last 3-4 year.
    Fuel pressures maybe, but the STFT is jumping around would this happen ?

    Dam car is just to cleaver ARRRR

    Give me a set of points and a SU carb
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  9. #7
    Rods 'n' Sods Junkie geof's Avatar
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    If your bored here a video of the odb readings
    https://youtu.be/gVzRX0gxw0M
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  10. #8
    Rods 'n' Sods Junkie geof's Avatar
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    Found the little bas...d on the 3.0 petrol there is a air pump that forces air into the exhaust at start up for a few mins to help burn any unburnt fuel. I cleaned valve that should close and it’s all so much better. Even got though the MOT
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