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Thread: P0170 & p0173

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    Default P0170 & p0173

    Vectra 3.2 auto. I keep getting P0170 & P0173 Fuel Trim, its not being set by the long term fuel trim, neithether bank is running lean or rich. I have changed the following, Maf sensor, 2 oxygen sensors, spark plugs, Thermostat and temp. sender both of which were faulty, and it only ever runs on Shell Optimax. I have run injector cleaner in it. It also fluctuates beteween closed and open loop fueling even when hot, and especially on over run.

    Any body any ideas, the car runs fine, but that light is irratating.

    Thanks Ian

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    Vehicle : CDTI 150

    Trim : Design

    Engine : Z19DTH

    Year : 2005

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    Have a good check of the exhaust for leaks prior to the lambds sensor, also check for splits/leaks in the air intake system

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    Thanks Les i have checked for leaks, even used plumbers smoke matches but cant see or here any air leaks, i also have a stainless exhayst and have checked joints up to the manifold, but i will recheck, I was wondering if the cat was showing its age, its 02 reg 57k miles, but the cat loooks very scruffy.

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    I have the same problem with the fault codes P0170&P0173 (http://www.vectra-c.com/forum/showthread.php?t=90198).

    I have also changed MAF and plugs, but it didn't help at all. I suspect vacuum leak because the STFT of the both banks goes up to +25% under vacuum (lifted throttle pedal but no engine braking). Otherwise the STFT and LTFT values are fine.
    How did you check the pipes/gaskets for vacuum leaks? Have you measured the vacuum in the inlet manifold?

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    I checked for leaks using plumbers smoke matches working on the assumption that if there was an air leak it would draw the smoke in, i am however going to take the pipe off from the EGR valve to the front of the throttle body, the parts i can see look ok, but most of it has a braider sleeve which kneeds to come off for a proper inspection, a sunday job unfortunately.

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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

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    The best way to check for leaks is to idle the engine and block the tailpipe with a rag (you won't get a full block condition probably) and then listen and feel all the way down the exhaust system for leaks.

    How do you know when the car is closed or open loop fuelling? and why do you think this is a problem? It is supposed to, given the operating condition.

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    In my case the exhaust is ok, had the MOT today and the emissions were exellent, no extra O2 (which would mean hole in the exhaust pipe). My problem is the vacuum... I have ELM327 USB scantool and I can log the fuel trim values and put them into graph, together with throttle position, vehicle speed, engine temp etc.

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    I got a mate to drive my car whilst i had the laptop connected, and i could see the fuel system ocassinaly switch to open loop, now as far as i am aware open loop is a set of values programed into the ecu for when the engine is cold, and according to my local vx dealer it shouldnt be going into open loop when hot, it does it mainly on the overun, which is when the engine is on maximum vacum, so i suspect i might have an air leak after the maf sensor.

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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

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    There should be no fuelling at all on over run at fairly high revs. As the revs drop, then fuelling will start again for combustion stability reasons.
    Open loop fuelling will probably occur at higher revs at WOT. The dealer knowing anything detailed about the calibration is unlikely, unless they have a special interest. They can't change the calibration setup or values anyway, only download a whole new calibration to the ECM.
    The dealers aren't Engineers (in the vast majority of cases) and don't really know about the detailed level of how a lot of things actually work or are programmed etc.

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