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Ridin Dirty

misfiring problem

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hey guys my s15 has this problem every now and again after it gets started it shakes violently and i assume its misfiring and all i have to do to stop it is push down slightly on the front coilpack and it then returns to a normal idle. its been getting pretty bad lately even starting to shake when i pull up to the lights. im guessing coilpack or spark plugs ? havent changed the spark plugs yet and dont know their condition, is it an easy job to do spark plugs ?? cheers for any help guys :)

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Piece of piss to change the plugs bro. Are your coil packs screwed down or just sitting there?

I would go and get some new plugs and begin the process of elimination.

How much boost are you running and what engine mods have you done?

The reason I ask is that if you are running reasonably hi boost, you should probably go up a heat range in your spark plugs.

The plugs you need are either BKR6E if you are running under 14psi, or BKR7E if you are running higher that 14psi.

That's what I have gone by for a few years now and has worked for me.

 

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the coilpacks are screwed down and im running stock boost. ive got coilovers, swaybars, tie and castor rods but the only engine mod is a pod filter.

are the bkr6e copper or iridium ?

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They are coppers. Iridiums are a waste of cash IMO. Buy the copper plugs and just change them whenever your change you oil.

 

Changing the plugs is just a matter of pulling out your coilpacks and unscrewing your plugs and screwing the new ones in.

You will need a spark plug tool which you can get from any auto place for a few bucks.

Edited by greens14

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ok sweet as ill just watch a youtube video to get some confidence haha. any possible way i could f**k it up ? as in anything i shouldnt be doing or anything to watch out for ?? sorry if im being annoying i just want to do it right

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Over tightening them and gapping them correctly, where about in oz are you bro? If your in bris etc pm and I'm quite happy to show you

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ok so i put new bkr6e's in and it felt like it was idling a lot better and then a few days later out of the blue it started shaikng more violently than in the past. pushed down the front coilpack like i used to do and it idled a bit better but was still misfiring so i then pushed the 2nd one a bit and presto it idled perfectly again. does this mean i need new coilpacks ? or is there something else it could be ?? cheers

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ok sweet as ill just watch a youtube video to get some confidence haha. any possible way i could f**k it up ? as in anything i shouldnt be doing or anything to watch out for ?? sorry if im being annoying i just want to do it right

 

Are we being trolled here still can't work it out

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no im not a troll, i just need to watch videos on youtube since only a few good people on here actually help me and the rest do the same as you, offer absolutely no help just ridicule.

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could be some bad wiring in your coilpack harness. mine does that every now and then...misfires on boost so i get out and jiggle the wiring a bit and itll be fine again untill the next time i bump the wiring when working on something

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No, splitfires only come with the coilpacks,

i had the same problem as yours, ended up getting splitfires and didn't have a single problem after.

unless you want to cheap out and just get single coilpacks instead of all 4.

but from reading your post, it seems like its more than just 1 coilpack.

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They are coppers. Iridiums are a waste of cash IMO. Buy the copper plugs and just change them whenever your change you oil. Changing the plugs is just a matter of pulling out your coilpacks and unscrewing your plugs and screwing the new ones in. You will need a spark plug tool which you can get from any auto place for a few bucks.

 

Had a lot of trouble finding an old wire-style gapping tool myself. Tried all the normal auto places to no avail. That said, Trade Tools sell them for about $13.

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