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Thread: Stuck with fault codes p0170-11 and fuelsys1 open loop

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    Vehicle : Vectra

    Trim : GSi Auto

    Engine : 3.2

    Year : 2004

    Default Stuck with fault codes p0170-11 and fuelsys1 open loop

    2007 Vectra Z18XER

    As per title really. Engine threw a random EML whilst accelerating from stationary and really rough idle. P0170-11, no other codes. Read live data and MAF voltage was bouncing about on a steady TP input. Replaced with genuine siemens VDO MAF. Seemed to run perfectly on open and closed loop test.

    About 80 miles into next journey same random EML coming off the throttle. P0170-11 and fuelsys1 OL fault and slightly rough idle. Car had an EDS IPF remap last year so a slightly lumpy idle is normal. Even replaced the exhaust cam solenoid for good measure with no effect.

    Along with the P0170 was a list of not present faults including MAF, CT TP etc.

    O2 pre cat is holding steady voltage and O2 post cat is gently cycling voltage.

    I've sprayed carb cleaner around every vac pipe, servo, cam cover, oil filler and dipstick, air intake joints and flexi and can't find a leak anywhere.

    Have noticed that exhaust note has got a bit more gruff than normal.

    Stumped really, any good ideas before I have to pay someone to smoke test it and tell me less than I already know.

    Many thanks

  2. #2
    Regular Member CLUB04's Avatar
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    Vehicle : Vectra

    Trim : SRI

    Engine : 2.2 Direct

    Year : 2006

    Mileage : 84,000

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    Have you checked all earth points?
    If they are all good, disconnect the battery for half hour and let everything reset, that might help

    Sent from my H8416 using Tapatalk

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    Midlands - Vxr Owning Dick Dog_Book's Avatar
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    Vehicle : Vectra Estate

    Trim : VXR

    Engine : Z28NEH

    Year : 07

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    I’d read through the troubleshooting section where hopefully people with issues with their engines have posted a similar issue and updated if a solution found.
    Vectra VXR estate 2007 Sapphire Black
    Teapot Tuned 255/300
    Eibachs B8's, fully loaded factory options

    Tech2 & MDI diagnostics + SPS

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