Hi, this is my first post. I am looking for some advice on what could be wrong with my car as I've already gone done the route of having a garage look at my car with no improvment (luckily I carried the work out myself for a fraction onf the cost!).
I have this wierd hissing/tapping/rattle/clicking (not sure what to call it) that started a while back, but I've heard a lot of focuses sounding similar so stupidly I left it. Much more recently the engine has become very underpowered which is when I took it to a garage and they said I needed a new catalytic converter and the rest of the exhaust all the way and including the tailpipe. So I bought all that new and fitted it. While it did make a slight difference to the noise, the power was still down and the noise still there, especially under moderate to hard acceleration and lower revs. So I thought I'd check the plugs to see if they had become sooted up as a result of the cat failing (not sure it even had now.. but thats past and I have a new exhaust now). removed the plugs and they all looked fine except one (furthest right as you look at it, nearest the distributor). This onehad oil all over the lower portion, thread and right on the tip. I have not been loosing oil noticeably, was checked and topped up about 2months ago and still right at the top mark. My question is what does everyone think could be wrong. I've searched everywhere and not found much conclusive evidence. Some say valve seal, some say piston ring, and some say head gasket. What do you think could be the most likely as that where I need to start as money is tight (just finished uni and hardly earning anything...) and I need this fixed to get to work. I'm hoping its something I can take on and do myself to stop costs rising. Any and all help appreciated.
Also here is a quick video I took to try and let you hear the sound it is making (this is after the exhaust change, and I have checked for any leaks in that as well.)
Oh and its a 2002 1.6