mattyross
Member
Registered: 22nd Dec 05
Location: lincolnshire Drives: 1997 C12NZ
User status: Offline
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i have a p-reg 1997 1.2 eight valve C12NZ
95 thousand miles, owned and maintained carefully for three years.
the engine has suddenly and fairly recently developed a missfire after starting from cold
the engine turns over and fires perfectly, as per usual
but nine times out of ten it suffers from a mild-violent missfire.
i hold and stabilise the revs at fast idle for approximately one minute,
then the missfire eventually settles down and the engine performs normally.
my ignition leads are a year (15k miles) old
my spark plugs are the same and have been cleaned/inspected
i have purchased and fitted a new distributor cap
i have recently replaced the coolant temperature sender in the inlet
i am well and trully confused and losing confidence in the car's reliability.
the problem is not logical and intermittent,
please help or offer advice/ suggested questions 
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williamsvts
Member
Registered: 11th Apr 06
Location: north east
User status: Offline
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poss headgaskett, coolant may be leaking in to the bore and causing it to missfire, is here any coolant loss?
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mattyross
Member
Registered: 22nd Dec 05
Location: lincolnshire Drives: 1997 C12NZ
User status: Offline
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quote:
Originally posted by williamsvts
poss headgaskett, coolant may be leaking in to the bore and causing it to missfire, is here any coolant loss?
no coolant loss at all, i keep a very close eye on it.
if any coolant is leaking in, it must be an extremely small amount.
as of today, i have noticed a very subtle missfire even when warm
placing my hand over the tailpipe, i can feel 'an irregular heartbeat'..
no water vapour or other signs though.
i hate this. thanks for your immediate help though, i appreciate it
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williamsvts
Member
Registered: 11th Apr 06
Location: north east
User status: Offline
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mite still be headgaskett or even a valve problem. try getting a leak test done
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ali_corsa
Member
Registered: 30th Jun 07
Location: Tamworth Drives: Focus st
User status: Offline
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headgasket mine was still the same changed cts sensor still the same so just changed headgasket and has been fine ever since
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