Pointy SV running on one cylinder intermittently.

Pleased to announce that the SV is up and running again

Went with replacing the rear cylinders coil for a new 'pattern' part (just over 15 quid from a known auction site) after being advised to go this route and......it was still missing intermittently

Found an old plug, stuck it in the cap and balanced it on the frame to see a regular sparking plug so started thinking maybe it was the plug....

Pulled out the 1500 mile, 6 year old Iridium tip plug, put in the original plug, fired her up and......no misfire......

Now to be completely honest I can't see how a plug (especially a 'performance' plug) can fail in this way......I've seen old plugs stop working because the core rots and draws out so I've emailed NGK to see if there was a batch issue in 2007.......currently awaiting a response.

Given the fact I've run iridium tips in a few performance cars over the years and currently in my CR-V, it'd be nice to know if I need to avoid them from now on

Anyhow, all the help and advice was much appreciated, guess I'll be pulling out the front iridium plug and go 'back to basics' to prevent further issues

Thanks all!

[Bibio]

i wouldn't give up on iridium just because one plug failed and as you say you have used them before and not had an issue.

i have had iridium plugs in mine for 14k and they are still going strong. i think there must have been a bad batch as i have had a few snap very easily.

plugs fail and i have even had brand new ones not work out the box.

Originally Posted by Bibio

i wouldn't give up on iridium just because one plug failed and as you say you have used them before and not had an issue.

i have had iridium plugs in mine for 14k and they are still going strong. i think there must have been a bad batch as i have had a few snap very easily.

plugs fail and i have even had brand new ones not work out the box.

Not 'giving up' on them completely just not trusting the other plug as both were from the same place at the same time.....

Had a very decent and helpful reply from NGK technical and although not allowed to publish any of the content, will be sending both plugs back for testing incase it turns out to be a batch issue that has not been discovered yet.