mk5 fiesta 1.25 misfire
06-01-2010, 04:32 PM
#1
also known as mini idiot
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mk5 fiesta 1.25 misfire
hi, at 1st the fiesta would have a intermittant misfire when cold but then as it got warm it would disapear.just lately its got worse,even when hot.
now it does it perminantly now. now i am quite good with mechanics but this has me totally confused.com
there is no sign of head gasket damage
ive changed the plugs
ive tryed different leads
coil works as i get a spark when the spark plug is removed and earthed on something metal
The misfire is coming from number 4 pot and its doesnt get any better or worse with the ht lead removed.
tottally flumuxed.
any help would be gladly recieved as my local ford thieves sorry dealers want £80 for a diagnostic.
now it does it perminantly now. now i am quite good with mechanics but this has me totally confused.com
there is no sign of head gasket damage
ive changed the plugs
ive tryed different leads
coil works as i get a spark when the spark plug is removed and earthed on something metal
The misfire is coming from number 4 pot and its doesnt get any better or worse with the ht lead removed.
tottally flumuxed.
any help would be gladly recieved as my local ford thieves sorry dealers want £80 for a diagnostic.
06-01-2010, 04:35 PM
#2
YES I KNOW I CANT SPELL
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have you tryed a compression test? or swaping the injector out of the problem cilinder for one of a good cilinder? to see if the problem changes to a different cilinder?
06-01-2010, 07:25 PM
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escort mk4 cossy 4x4
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coil pack is a common problem. even if its sparking to earth,when its in the cylinder under pressure,it wont work.
ps, 80 quid diagnostic,could be cheaper than randomly replacing parts,hoping to cure a problem
ps, 80 quid diagnostic,could be cheaper than randomly replacing parts,hoping to cure a problem
06-01-2010, 07:33 PM
#5
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There was a thread about this the other day and I'm sure someone said you can use a Zetec coil pack of a focus 1.8 or 2.0? I'll see if I can find the thread...
https://passionford.com/forum/ford-f...r-misfire.html
admittedly a Focus, but its the same basic engine I think?
https://passionford.com/forum/ford-f...r-misfire.html
admittedly a Focus, but its the same basic engine I think?
Last edited by Ginger Will; 06-01-2010 at 07:41 PM.
06-01-2010, 08:39 PM
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well after me and my dad had a chat about the problem i remebered that when the radio is on i get interference in the way off a small clicking noise,not when the cd is on,just the radio.
my dad said go and watch the leads with it running while its dark,move them around and tell me what you see.
well upon doing this i discovered that the leads are very slightly arcing across each other and onto the rocker cover.
when you rev the car the flashes and tiny sparkes get brighter.
so im going to buy a brand new set of leads.
i also discovered that spraying wd40 on the leads stopped this for a very short time.
watch this space to see if the new leads work tomorrow!
my dad said go and watch the leads with it running while its dark,move them around and tell me what you see.
well upon doing this i discovered that the leads are very slightly arcing across each other and onto the rocker cover.
when you rev the car the flashes and tiny sparkes get brighter.
so im going to buy a brand new set of leads.
i also discovered that spraying wd40 on the leads stopped this for a very short time.
watch this space to see if the new leads work tomorrow!
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