po79
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| posted on 6/3/19 at 03:01 PM |
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Zetec 1.6 SE misfire on N'4 cylinder
Hi guys,
looking for some help.
I've got a misfire on number 4 cylinder with a fault code of P0304.
The fault code comes and goes but the misfire does not.
I have replaced the spark plug, swapped spark plugs around but the misfire remains, removing the HT lead on number for makes no difference when
running and there is a spark.
I've looked around and all houses seem fine.
The fault code is confusing though as it comes and goes but the misfire doesn't and I think the fault code only relates to what the ecu can test
so any thing electrical.
I can't think of any thing except a sticky valve but I always use 5 -30 oil.
How can I check this or could it be something else ( hoping it's not had gasket!)
Cheers,
Po79.
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rusty nuts
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| posted on 6/3/19 at 03:37 PM |
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Try swapping the leads for cylinders 1 and 4 over at the coil, if the misfire moves then the problem is the coil , if not check compressions or better
do a cylinder leakage test , check for air leaks , if everything is in order try swapping injectors over
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ian locostzx9rc2
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| posted on 6/3/19 at 03:54 PM |
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As per last post
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po79
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| posted on 6/3/19 at 05:26 PM |
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Thanks both!!!
It was the coil pack.
I'm a bit annoyed with myself as this was one of the first things i suspected but as I had a good bright blue spark and with No4 lead off the
misfire remained the same I started to over think and forgot the basics and to triple check.
I think the fact the coil pairs cylinders together and the problem never shifted from No4 i doubted the coil.
I needed to unbolt the coil to get the swapped leads to reach (probably another reason i didn't triple check the coil) and once swapped the
misfire immediately moved to number 1 cylinder.
But thanks once again,
Po79.
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ian locostzx9rc2
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| posted on 6/3/19 at 07:30 PM |
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All sorted that’s the main thing
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