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Thread: Exhaust popping on overrun and after ive blipped the throttle

  
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    Browny_37's Avatar
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    Exhaust popping on overrun and after ive blipped the throttle

    Hey guys got a new car Astra Sport 1.6 16v a while back, but the exhaust went pop on sunday....and ended up getting a new zorst all the way thru from the manifold.......as due to incorrect parts fitted by previous owners with some obscence crushing of various parts of the zorst :'(
    I've had trouble with the rear sections being sealed.....its been back countless times and its a bit better than what it was...but still getting popping and banging through the exhaust.
    I've just disconnected the battery to reset the ecu going to give it 30mins to reset....i also changed and put proper gaps on some Champion EON2 sparkies yday, to find the old NGK R twin prong plugs to be ok on cylinders 1 and 2, but 3 and 4 to be a bit sooty (black)
    Maybe some new HT leads would sort this out?
    What i think is happening is that fuel/air mix is getting past the combustion cycle without being burnt... so im getting popping and clanging in the zorst.
    But only pops and clangs about 3/4 of the time.
    Sounds like a chaved up fezza poppin n banging as it goes down the road on overrun.

    Anyone else got any more suggestions....as i seem to have got the best seal on the rear section as of yet...the rest of the zorst doesnt leak...just the back section slightly, and thats got about 1/2 a pot of zorst repair stuff around it to try and create a seal.

    Im getting so annoyed with this car now

    Many Thnx

    Dan

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    Its popping because you must have a leak at a pipe join somewhere.
    Get the pipes clamped and sealed nice and tight.
    Check around the manifold/downpipe join.

    Fuel is cut-off on overun by the ECU, so it shouldn't pop.


    WIth the sooty plugs, that tells you the engine is running rich, are you getting the Management light on at any time?
    Could be lamda sensor playing up.
    IF you leave it running rich it will damage the CAT.
    My mk3,117K, and the engine is still going strong
    shame about the car shell tho,lol.

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    Thnx for the reply.....not got any engine lights on atm....goes like a train atm....understand it will do the CAT damage...but its got a Guarentee on it for 2 years, everything is clamped right up with pneumatic gun too
    Wondering if the injectors arn't firing right....or if the coil is goin wrong, or what evers wrong....dunno whats up.
    Ive tried injector cleaner when i first bought the car.....going to get the injectors cleaned...first, wonder if i can get a lambda sensor on the cheap from autovaux.

    Thing is i havent got alot of money atm

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    The lamdda can be playing up but not trigger the ECU light.
    If only one or two of the plugs are sooty, then it could be an ignition fault.
    Is the engine distributor or dispak.
    If its dispak then it could be that, might only be supplying HT voltage to two plugs, hence fuel aint getting burnt in the two cylinders that the plugs are sooty in.

    But i doubt the engine would run without two cylinders firing.
    My mk3,117K, and the engine is still going strong
    shame about the car shell tho,lol.

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    yea, ive had new plugs out tonite, and i think i'd got the gap a little too wide, its suppose to be 1mm gap according to the manual.....so ive made sure there is a 1mm gap this time.
    But sparkie 1 to 3 was white on the prong of the sparkies....and number 4 was just completely sooty.
    Also wondering if it could be the coolant sensor thinking the engine is always cool.....so it decides to run ritcher?

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    Could be CTS yeah, but that wouldn't make only one plug sooty.
    Sounds like its not firing, or misfiring on number 4.

    Check you are getting a good spark on number 4 plug.
    My mk3,117K, and the engine is still going strong
    shame about the car shell tho,lol.

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    not entirely sure what could be wrong with this now, as it doesnt feel like its missing a beat........just keeps trundling along.......although im slightly annoyed that ive had engine management light come on about 4-5 times today, 3-4 of them being on the motorway tonight....went out and kept coming back on.

    This afternoon it wouldnt go off until i restarted the engine.
    Will try the sparkies 2mozz.

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