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Thread: fuel trim bank 1 & 2 and misfire due to low fuel

  1. #1
    Regular Member shaunft's Avatar
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    Default fuel trim bank 1 & 2 and misfire due to low fuel

    hi guys have been having this problem for a while changed many parts with no effect used my autel maxiscan ms509 tool and did some live data readings so what im looking for is the shrt term and longterm fuel values mine are as follows
    between 880 and 900 rpm reads from -5.5 to 6.3on shortfuel trim 1 & 2
    and on long fuel trim 1 & 2 its at 5.5

    at revs above 2000 rpm short fueltrim is 25.0
    and on long fueltrim it stays at 5.5

    can anyone help on these figures as to my problem thanks

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    I'm not familiar with these readings or your GSI engine, but I'll take a stab at what they might mean...!
    Fuel trim is usually the amount the ECU compensates for under/over-fuelling. So, a +ve trim would increase the fuel in the engine, -ve subtract, usually in % fuel.
    In your case, at low speeds everything seems relatively sensible. Above 2000rpm, you're getting very low fuel on short term fuel trim, but ok long term. It therefore sounds like you're having misfire problems above 2000rpm - over a long period of time, the fuel is kind of ok, but if you sampled a short period, a misfire becomes significant and hence the error - does this sound like what you're seeing?

    If so, we're looking for a misfire problem above 2000rpm on a GSI - who knows the likely causes of this Members?!

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    Regular Member mattv6diesel's Avatar
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    Vehicle : Bmw 330d

    Trim : Msport

    Engine : 3.0d

    Year : 2008

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    Its telling you there is just a mixture problem. Air leak or air flow meter most likely.

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    So shaunft, what parts have you changed so far?

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    Regular Member shaunft's Avatar
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    changed coil pack 1-3-5 due to misfire on 5 and oil in spark plug chamber rockercover cover gaskets throttle boady complete intake manifold new front exhaust with flexi pipes and cat every one i speak to seams to think in line of air leak have used many cans of carbcleaner around engine to no effect my own thinking is along the lines of something to do with the fuel pressure have car booked in to go on diagnostic tool and some smoke thingy to check for leaks

  6. #6
    Regular Member shaunft's Avatar
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    well guys so some more info on the fuel trim bank 1 & 2 so last week replaced the maf meter and still no differance to the car so had it diagnostic read by auto electrition using vauxhall diagnostic tool and came up with this
    P0173 fuel trim malfunction bank (2) symptom 15
    P0170 fuel trim malfunction bank(1)symptom 15 any help on these symptom codes please
    also had smoke pro done and NO air leaks to be found
    replaced the fuel filter and after three days of the car running fantastic and more powerfull back to square one so would i be right in thinking poss fuel pump problem
    cheers guys for any help

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    Regular Member Critch's Avatar
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    Vehicle : Mk1 renault scenic... I know I know but it drives

    Trim : Basic

    Engine : 1.6 16v

    Year : 2003

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    What are your oxygen sensor readings?

    Is the car going into closed loop operation?

    What length of time is each injector open for?
    Has the mad wiring been checked?

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    Regular Member shaunft's Avatar
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    well guys just been to n.ireland in the beloved gsi and after spending lots of money on her she give up the fight as in there is oil leaking all over the front manifold and oil cap looks a bit creamy the oil burning on the manifold is getting into the car so when i got home i was sick as a dog think due to the fumes of the oil not sure what to do now NEW ENGINE OR HAVE THE HEAD DONE (NEVER Ends!!!!!!!!!!)

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