> are you sure this is something you want to get into?
If I didn't rely on my car, it'd be a curiosity, and lower priority than a bunch of other stuff I want to learn, but since I expect it to work when I need it, not understanding isn't really acceptable for me.
> what do you mean by your spark plugs being faulty?
Just a theory so far, someone mentioned it a while back of being a possible cause of sometimes taking a few tries to start, and since the battery has been replaced it has twice failed until I left it 5-10mins with the heating on. It might also be cold/damp, but one of those times was about 90 minutes after having been driven, and I read something suggesting that in those conditions it can cause an issue with the sparkplugs being confused about temperatures or something (I'm not describing that very well, and I didn't bookmark the page. :()
I've also recently been getting judderyness when driving, which I've also seen suggested as a spark plug issue, though that's got a variety of other possible causes too.
And that's the thing, I'd like to be able to accurately diagnose an issue - I don't need to be able to fix everything, so long as I can at least have an idea about it.