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You can see a small bit of rubber ring on some of them (notice on the picture above you can see it on the one on the left, but not on the one on the right). tbh you would soon know if they weren't in correctly as it would do similar to what happened yesterday when you have an air leak :)
I always use GSF, they have the NGK plugs, but I cant see HT leads on there for some reason, so you may have to go else where. G172 on here is a good shout.
I would say the HT lead needs replacing then. Its probably damaged/broken down inside, and by moving it you have just made a better connection for it. it might last like that for a long time, or could fail again tomorrow. If it was the coil pack or spark plug, you would generally expect no...
that should have read injector 2 and injector 4 btw (i'm miss-read a previous post which said third from the left, not cylinder 3!), i'm sure you swapped the correct one anyway? its regardless now anyway as from what you have just posted, all injectors are working.
thank f**k for that! it sounded a lot worse than an air leak on the video. unfortunately what Danny is telling you to do wont tell you if it's the coil pack, ht lead or plug. As you already know its cylinder 3, its not really going to tell you anything new. you need to swap the full HT lead...
Re: Misfiring + Engine Light (& now noise from engine)
ps. an air leak somewhere can cause it to rev, but that squeal sounds like metal against metal on the video.
Re: Misfiring + Engine Light (& now noise from engine)
Christ that sounds bad! don't run it for the moment!! what did you do before this happened? did you take the inlet manifold off? Regarding the ht leads, you needed to swap the whole lead over. Are you sure you have put them back on the...
you can leave them as they are :) That eliminates the injector, so the next thing to do is swap a HT lead over. You will have to remove the upper manifold to do this iirc as they are under the manifold. See if the misfire moves position, if not, then I would say its the coil pack or spark plug.
to get the rail/injector back onto the manifold, line up the injectors with the holes and try wiggling the whole assembly up and down whilst pushing inwards. You can also use to grease to help it go in. Remember to reconnect the fuel rail before starting up!
with the fuel rail removed, remove the silver clip by moving it upwards with a screw driver, then the injector will just pull out. Its takes a bit of force to pull it out once the clip is removed.