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Thread: had a big problem this morning

  
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    puntobritz's Avatar
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    had a big problem this morning

    Hi, I have a mk4 1.6 8v and driving to work this morning and all of a sudden the engine started to rev up and down and lost power, stunk of fuel and the car was vibrating all over the place, i could still drive the car but i new it wouldnt of done it any good. AA came out and it was only running on 2 spark plugs not 4. check the coil pack and it was only giving off a spark to 2 of the plugs out of the 4. i changed the coil pack this morning and its still happening. its the two middle plugs out of the 4 thats not working.
    would anyone have a clue what it could be before i take it to a garage and get them to charge £50 an hour labour
    or has anyone had this problem and fixed it and would know what it was?
    I did hear ECU but im hoping its not as thats going to be well expensive

    really hope someone can help
    thanks sam

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    wardie222's Avatar
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    hi my car done the same, miss firing all over the place, is your engine light on your dash?,,,,i unpluged my battrie over nite and it was fine after think it reset ecu,,worth a try cost nile so y not try!

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    Could also quite easily be the crankshaft sensor...

    Or as youve already said possibly ECU but i'd deffinatly swap the crankshaft sensor first as this is only a small cost compaired to ECU.

    If it is the ECU look for a second hand one from the same engine type as yours, but make sure you get the transponder that goes around the ignition barrel and the chips from the keys or you'll be stuck as they all have to match with the same imobilizer code.

    Good luck.

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    Toms1989's Avatar
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    What year is your Astra? if its 2001 onwards, you can do a pedal test to read off fault codes
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    pedal test? whats that? i want to know why my engine management lights on too..

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    Riskoe's Avatar
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    Is there a guide for pedal tests in the how-to section?
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    mines a 1999 which is a bummer. crankshaft sensor? is that the plug that goes into the coil pack? ill change that next as i do really want to be leaving the ecu till last. ill try the battery thing for the time being. if its possibly ecu then ill get back to you (dano2k0) so you can point me in the right direction for the ECU.

    thanks for the advice so far much appriecated
    sam

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    you should get a haynes manual if you are going to be doing alot of work on it.

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    how did the battery work out ?

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    nothing i did the test where you put a cable on 4 and 6 in the diagnostic socket and came up with the code 1405 and came back with EGR valve problem. i had this problem earlier on in the year which i had blocked off and my engine managment light comes on and off because off it so i think it came up with that for the fact being it had no EGR valve just a blanking plate. But it seems like the EGR vavle runs the middle 2 cyclinders and there the ones that arnt sparking from the coilpack. when i took the spark plugs out the middle 2 had like wet ends and the outer 2 was just fine and dry. but i tryed them in the outer cycliners and it still runs the same so it isnt the spark plugs.

    anyway later on that day i had a good friend that came round and we did a proper diagnostic test on it and it came back with...
    Ignition coil B primary/secondary circuit.

    i take it this brigns me back to the coil pack so im not sure if anyone had any ideas? for some reason theres..
    Ignition coil A primary/secondary circuit
    Ignition coil C primary/secondary circuit
    Ignition coil D primary/secondary circuit
    etc
    mine just came back with B?

    I had the idea of finding a friend with the same engine and changing over the coilpack and EGR valve then if i no it doesnt work then it gets rid of 2 possibilities as my coilpack was a used one form a breakers so it could of been a dodger to begin with.

    thanks again sam

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