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Thread: please diagnose my 1.7 dti 'missfire'

  
  1. #1
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    ians5's Avatar
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    please diagnose my 1.7 dti 'missfire'

    Really clutching at straws now ...
    1.7 dti, 2004
    misses a beat with quite ajolt once in 10 minutes generally only when warm.
    The Engine warning light has never been on.
    There's no smoke, no other symptoms, car in very fine shape other than this.
    So far I have checked over the engine bay for leaks and loose connections, electrical and vacum there's nowt obvious.
    I have replaced:
    air filter, fuel filter and seals. I have been into the fuel pump ECU and resoldered the 'known' dodgy connection.

    Surprisingly the pedal test threw up a MAF error code 0100 ( i have no idea when this was from though or if there could be more detail in the system)
    As a result I have replaced the MAF with a new Bocsh one.

    Still the problem persists and no more error codes with the pedal test
    would a proper diagnostic show up anything else, I fear that I'm at the point of writing a blank cheque ... any one offer me a light at the end of this tunnel ??

    reading here I'm thinking ..... it could be a number of things like

    ...vacum pipes
    accelerator pedal unit
    oxygen sensor
    the list goes on.

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    hi mate

    my car does this also and my mates car. had mine at vauxhall dealer
    and they coudnt find anything. mines had
    new ecu
    egr valve
    maf
    all vacume pipes checked
    full service twice
    then blanked egr still the same. this seems to be a common fault once cars get some miles on them mines done 95000 mile started doin it at 90.000 if you get it sorted let us all know
    many thanks

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    hi fella

    i also changed my crank senser but no differant i thought it could be
    a worn accelerater pedle switch thing but who knows dealer said they had a few in with peddle problems hope this helps

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    Try the temp sensor for a loose or bad connection. It could be the temp sensor (ECT) is not reading back the correct voltage to the ECU; cheap to replace.

  5. #5
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    pedal problem is today's favorite .....

    but where's this temp sensor then spedo ?

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    The sensor sits on the top rad hose housing where it joins the engine, if this sensor is playing up it causes poor drivability at slower speeds. i.e. jurking. It could also be a failing crank sensor output or loose wiring, usually causes a problem at higher speeds, no crank output would mean no start. By the way your vehicle does not have an oxygen sensor as it is a deisel. Also check the condition of the MAF plug and wireing. It may be better to get a proper diagnostic done to help nail down the problem. If you have been moving wires around you may have caused some of the fault codes, get them cleared and try again. Check that the air intake pipe is properly cliped together and change the air filter.

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    Thanks off out to have a look in a mo
    Ive already stripped and reassembled the air induction pipes and fitted a new filter

    Well the oxy sensor is one less thing on the list !!

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