Engine Error code P0302

[pete 56]

Originally Posted by Banshee

I have spare leads if you want to try a different one, as I swapped mine out a couple of months ago when I had to replace an injector.



I think I have some spare plugs (old ones), as well.

Hey Banshee I might take you up on your offer. Work has taken over my life at the moment, so a little difficult at present. Will make contact, thanks again, pete...


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[Banshee]

Something else you could try in the meantime:

1. Swap the 2 & 4 plugs. See if the misfire moves.

2. The leads might just be long enough, swap 2 & 4 leads . Again, see if misfire transfers. (Both ends, I mean, I accidentally crossed over 1 & 3 & the 3.8 drives like even more of a dog on 4 cylinders! And you get 'multiple random cylinder misfire' code that does SFA for trying to figure out what is wrong. I checked the leads to make sure they were right 3 times before I even started the engine & still got it wrong. )

[pete 56]

UPDATE:
Visited Banshee, thanks and was given 2x leads & 2x plugs, both used. Tried the lead, light back on, replaced the plug and it seems back to it's good old self, yeah!
Now I'm thinking should I put my lead back on and see if it's ok proving it to be the plug only
Should I buy a brand new plug.
Should I buy 6 new plugs, decisions.
Best way to go?



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[OzRick25]

What did the sparkplug look like?

[pete 56]

It looks OK to me but I'm absolutely no expert! Couldn't see any cracks in porcelain, colour light grey


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[pete 56]

Was a Champion not NKG as I thought!


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[OzRick25]

Looks ok maybe running a bit lean but hard to tell. Depending on Kms and what has already been done I'dd get a set of stock plugs, stock leads, and a stock coil from Rockauto (these are due at 160 or 165,000 km from memory).

If you do replace all plugs you'll be able to get a better picture to whether you are running lean and there is an issue with cylinder 2 injector but you could just pull a few other plugs to compare with as well.

If your thinking of getting any of the higher capacity coil or leads I'd recommend doing a few searches on the forums (I wouldn't)