yesterday i went for a drive to my friends to pick up some headphones and rally car was fine...this morning was misfiering alot....like 3 cylinder all the way to coventry and back
anyway at lunch i go take a peek at them, cylinder 1 the plug was completly fouled with oil and not fiering at all, like take the lead off and running the same.
cylinder 2 the ceramic around had cracked and chiped...i hadnt even touched it so why the duce has it cracked for no reason...the other plugs are in nice condition and have a great colour to them...even the 2nd looked ok if not a lil oily on the outside edge
are they just the wrong plugs? iv got a different set in there now, the 4 electrode ones (had them in my 1st mini, only just put them in before it killed itself) and its runnin sweat as a nut now if not better than before

Cracked Spark Plugs!
Started by
mini93
, Jan 15 2008 12:37 AM
6 replies to this topic
#1
Posted 15 January 2008 - 12:37 AM
#2
Posted 15 January 2008 - 01:09 AM
Could be you were just unlucky and got a bad plug. Could be the took a knock at some time. Could be they are overheating. Could be none of those.
#3
Posted 15 January 2008 - 07:24 AM
Is it always on cylinders 1 and 2 David?
Could it be that the Weber's running lean on that side? Perhaps the idle mixture adjustment needs sorting out? Carb needs balancing or something? Dunno to be honest.
Could it be that the Weber's running lean on that side? Perhaps the idle mixture adjustment needs sorting out? Carb needs balancing or something? Dunno to be honest.
#4
Posted 15 January 2008 - 08:32 AM
as dan says, it could be a bad plug, or it's been knocked.
i've cracked a few spark plugs whilst undoing them before, where they've been screwed in too tight. you know when you push and push and push then all of a sudden it cracks loose, well when the sparkplug socket jerks to one side that's when it happens.
i've cracked a few spark plugs whilst undoing them before, where they've been screwed in too tight. you know when you push and push and push then all of a sudden it cracks loose, well when the sparkplug socket jerks to one side that's when it happens.
#5
Posted 15 January 2008 - 05:55 PM
i never over tighten plugs, and plus the last people who did them up were southam mini and metro centre...they did it tighter than i usualy do but not beyond what they should be
the 1st time was missing on number 1 and 4 cylinder...so i guess that rules out the weber balancing to 1&2 Cyl.
i think im just going to persume i got sh*te plugs twice, the 1st lot were ones the mini came with and i just got the same ones the 2nd time round...this lot i know are definatly for a mini and so should be correct heat range *should* being the main point
the 1st time was missing on number 1 and 4 cylinder...so i guess that rules out the weber balancing to 1&2 Cyl.
i think im just going to persume i got sh*te plugs twice, the 1st lot were ones the mini came with and i just got the same ones the 2nd time round...this lot i know are definatly for a mini and so should be correct heat range *should* being the main point
#6
Posted 15 January 2008 - 07:32 PM
What plugs are they?
I've only used NGK spark plugs for years and I've not had a days trouble from them.
I've only used NGK spark plugs for years and I've not had a days trouble from them.
#7
Posted 15 January 2008 - 07:43 PM
they were NGK copper core ones, like i said not sure if they were the right ones tho, it all fit up correctly electrodes gap etc, ran fine every day till yesterday and pop missfiring away
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