TangoVTEC

^

I agree, the mechanical advantage of most 1/2" drive wrenches could mean the difference between correctly torqued plugs and 'oh dear, little too much'!

s2konroids

I have looked when i last replaced the plugs, 2 years ago - so if they hadn't been tightened properly they have came loose by now and probably broke.

steveSC2

2 of my plugs worked loose the other week,and my dad said he had been on a spark plug website,that states you should tourqe new plugs to 25 lb and used plugs to 30 lb(to compensate for the squash washer)

I didn't fancy tourqeing them to 30,so did them at 25 lb,touch wood they hav been fine since

s2konroids

Yeah too tight and you'll knacker the thread, i'd rather on the tighter end though

markforrester99

I changed the plugs on my S2000 recently and one very good design feature honda used on the coil packs is the 10mm bolt holding the coil pack to the cam cover. At least if the plugs do become loose you get a missfire rather than a jeremy clarkson mx5 style plug shooting into the bonnet.

It serves two purposes in my eyes 1. being it prevents the coilpack coming off of the plug in the first place and 2. even if the plug unscrews the coil pack will still retain it in its place. I forget how many times with older cars i got rough running only to find the HT lead rubber boot had popped slightly off of the spark plug.

I imagine after an extended period of driving with the plug loose it would cause the insulation to melt on the coil pack thou.