pater, in your quest to identify which ignition coil is faulty & it's subsequent replacement, take my advice...find a mech that's pro with cefiro & get him to buy from your preferred spareparts shop rather than yourself. otherwise, you'll be in hot soup when a situation like mine happens. here goes...if you've read my created posts, you'll notice that I experience vibration/jerkiness when idle. it was a result of changed plugs but the earlier mech knew nuts about cefiros (and bear in mind that i didn't pay peanuts...so shouldn't expect monkeys doing it!!). they swore by their bloody heads that the plugs were fine. yet, after sending to a new mech that changed the plugs back to my old ones, whoalla!! the prob's solved! fyi, the new plugs were original as attested by TC. the ratings were correct. it's NGK Platinum TFR 6G-11.
now, the supplier rebutted my claims by saying for electrical stuffs, no warranty. coupled with the delay in informing them, it's impossible to make claim from their supplier, they say. however, the delay was attributed to the 'monkeys' that told me to "try & see for another few days-lor.." afterwhich the new plugs were installed resulting the vibration problem. after voicing out my dismay, they revert back asking me to check which plug out of the six I bought is faulty. WHAT??!! which mech will do this dirty & time-consuming job? (unless no business) it's not a mere un-plug & re-plug affair. yet, they have the audacity to ask this...jeez..i suggest that we should create a sticky for "blacklisted suppliers/mechs" coz i know a lot of us went thru' this stage, right?
you see, the essence of the story is that you check price, ask your preffered mech to buy from that particular shop & subsequently install it. if the parts don't work or cannot rectify the apparent problem, suppliers must accept the returns. if not, no mechs would not even pay (coz they have credit terms), let alone to buy again from them. and mechs talk around...they would spread the news fast amongst themselves when such a case happens. in short, the mech's bargaining power is significantly above ours (consumers).
now, i'm awaiting the autoparts shop's response from their supplier. fingers crossed that they won't "tai-chi" me around. otherwise, i'm bringing this matter up to the consumers tribunal court for my due refund!