(17-12-2012, 09:24 AM)Poodle Wrote: No, i'd taken them out completely, left gaping holes to atmosphere on each cylinder, ran fine. :pYes, they were unplugged, had put new ones in and had to rush to finish the job, forgot to wire them in.
Fair enough, maybe i was lucky. All i know is i drove around with it like that for a couple of weeks in bollock-freezing weather and didn't really notice the difference, sure it was a bit rough first thing, but that was normal lol.
Cully, i'm not saying they aren't used on an HDi, just that they don't appear to be necessary, in my experience anyway.
Lol, pedantic, you knew what I meant.
Also, you say they're not necessary but the engine ran rough......well thats why they're there lol, so its up to a decent cylinder temp quicker to run smoothly and not waste fuel and create so many emmisions, not a neccessity, but useful to have, the OP says his car still starts anyway.
I'm tempted to try some new plugs in mine now to see if it makes a difference, will see what they cost first lol. But if its chucking fuel out as smoke on every cold start maybe thats where my mpg is dropping. Hmmm....
Hmm, at £40 for the set.....I don't think I'll bother!