Technical Misfiring - P0300, P0302, P0303, P0304

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Technical Misfiring - P0300, P0302, P0303, P0304

improveddc

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Jan 27, 2007
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Hi all,

Just looking for some confirmation from anyone who is a bit more technical than me.

Last night my car starting misfiring when ticking over and missing when accelerating. I had noticed in the last couple of days once or twice it seemed juddery and last night it finally stayed constant.

Anyway plugged in my basic fault code reader and it came out with P0300, P0302, P0303, P0304 related to misfiring.

The same thing happened about 3 years ago (although i didn't have codes then) and i replaced the Ignition Coil pack which seemed to solve the problem.

Can anyone confirm if this sounds like the same situation? or could it be plugs/leads which i think is unlikely as 3 coils are misfiring on the codes?

Also should I change plugs and leads at the same time to be sure?
 
are the holes easy to spot?

are we talking about a tear in the rubber?

thanks


pull leads out and my guess is one will have a hole in one of the ends that go onto a spark plug, that spark can travel to all the other plugs and does some strange things with codes, often comes up as multi cylinder miss fire when only one lead has the hole
 
If one plug lead is duff, change the set as the others will be following along soon. Presumably the spark plugs are new. Old ones can look ok but be breaking down internally.
 
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