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  • Hi,

    Thanks for the reply :)

    The photo of sparks plugs are the old ones i took out when I changed them a few months ago, don't think they are in order. If I get time in the next couple of days I'll photo the new ones.

    Did the compression again recently after dumping fuel system cleaner in and from warm cly 3 is 14% down on the others. No signs of head gasket going, emptied all the coolent out when I did the cambelt/water pump and S/S underfloor pipe and it was really clean. I did not try putting any oil in the cylinder to see if it improved.

    The ECU does not give readings on cylinders 3 and 4 only 1 and 2 apperently so Pscan can not read what is not there so gives a ?. The misfire count data seems screwed up, always seems to be one of three values so I have ignored it now.

    I can't remember what the exhaust smelled like after failing on massivly high CO but I would expect to smell petrol if there was incomplete combustion. I came near too death sniffing the exhausts of all three cars recently - lol.
    VW T4 camper smelled of exhaust but has no cat anyway.
    Astra smelled of nothing but is a much newer car.
    MG TF smelled of exhaust like the T4 but a bit stonger, no petrol or sulphur smell.

    Did a live scan after fuel system clean, new upstream sensor and coolant sensor from Rimmer Bros and it seems better. See attached - just the fuel correction and both o2 sensors. The fuel correction(I think this is the short term fuel trim) is only fluctuating a few percent either way from 100% and the O2 sensor seem to be doing the right thing, upsteam fluctuating and downstream staying mostly steady on the higher side. The cat is using the O2.

    Hoping that means the fuel trim error is gone and the cat is ok still. I have cleared the error but I need to let it run a good few times to see if it comes back.
    Praying it was a dicky injector cuasing overfueling and the cleaner fixed it.

    If not...

    Maybe a valve on cylinder 3 like you said or too high fuel pressure in the rail (I've checked the vacuum hose to the FPR). I have checked for vacuum leaks all over with smoke from a vape box and a hose connected to the breather. Also double checked the cambelt I did for timing - all good.

    If it was a leak in the exhaust manifold I would have thought it would have been picked up on the MOT.

    Written a letter to Santa asking for my car to work - that will do it.
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