Just Had My R33 Tuned,but Now Its Misfiring Quite Bad ( Yellow Jacket Coil Packs)

[Dose Pipe Sutututu]

dont get me started on YJ's and performance China Racing wise lol. I think a few of you saw the shit storm on some of the products I and a few others had bought which do not fit.

FYP

[Trex]

FYP

good call. fixed it myself too

I HAVE to say; That certain supplier is worse than the producer, as they should have stopped importing certain parts. Anything to make a quick buck eh? Don't worry about stepping over anyone on your way there.

[deprived777]

quick question ,what if you over tap the spark plug and the gaps to small. what do you use to widen the gap without damaging it ?

[75coupe]

Oh dear

[Dose Pipe Sutututu]

Screw driver if coppers, iridium you'll destroy it that way.. just use pliers and be super careful

[Trex]

quick question ,what if you over tap the spark plug and the gaps to small. what do you use to widen the gap without damaging it ?

i have used a flat head in the past and was very careful to push it up.

[Ben C34]

Gapping tool.

[Ben C34]

Pliers

[Cowboy1600]

I think you are aware of the problem (being the coils) and band aiding it by gapping the plugs down isn't really going to be a long term solution.

Our setups are quite similar. Same turbo, computer, AFM, injectors. Though my car makes around 40 rwkw more at the same boost.

I run Splitfires and only had an occasional misfire when using BCPR6ES plugs, but since changing to one heat range colder (the same as you are running) I've had no misfire issues.

I've got brand new Splitfires with BCPR7ES (I think, or whatever Trent told me to get). On 18psi I still had a misfire. Gapped them to about .6mm and they are all good.

I think you should be aware that results with coilpacks and plugs seem to vary quite greatly on RBs for some reason. Two people can have identical set ups but have two very different experiences. There's obviously something else in play, but plug gaps are the only known fix as far as I am aware.

[deprived777]

before reading replies i figured out how to put the gap back up haha i found my round medallion tool and used that. i checked 2 spark plugs and the gap was 0.75mm ..they were supposed to be 0.9mm. unless im measuring it wrong but i span the medallion around carefully till it stopped moving and its where it landed.

i'll do the rest tomorrow so i can see what im doing lol

[Ben C34]

That's a ghetto way of doing it. That would kill iridium plugs.

[Ben C34]

The hole on the round gapping tools is to open the gap, by levering it. Very easy.

[Trex]

[Ryno]

There's obviously something else in play, but plug gaps are the only known fix as far as I am aware.[/background]

Only known fix? There are several ways that could fix the problem other than gapping down the plugs.

It could be a poor engine or coilpack loom. Or the engine earth could be the problem. Also the connection to the spark plug within the coil pack and the coil pack plug itself could be the issue - though this is easily fixed by cleaning the coilpack and using dielectric grease.

By gapping the plugs down, you are trading off low throttle performance and economy, and the car will make more power through the rev range with the largest gap you can get away with running.

So yes everyone's engine is in different levels of condition, but I'd fix the underlying problem rather than living with gapped down plugs.

[deprived777]

yeah im just gapping them down for a temporary fix, didnt realise you lose low throttle response though car is already poor on petrol lol lucky to get 300km out of a full a tank .

coilpack loom look looks like new from my untrained eyes.

coilpacks look very clean i took two of them off earlier, i didnt use dielectric grease though i'll lhave to look into that

[89CAL]

I find they're ok on the dyno whilst I'm tuning, great for street use.. as soon as I hit the track and do a few laps.. bamm misfire city!

But at 0.5mm it's tits.. no misfires at all!!!

Interesting

My old splitfires died recently (this was not a gap issue, they were breaking down nearly on idle. Must have had at least 1 no good coil) so i have a brand new set in now

Might gap the plugs a bit lower next time to be safe. Although its only a street car and havent really had any dramas before on 0.8

[admS15]

Interesting

My old splitfires died recently (this was not a gap issue, they were breaking down nearly on idle. Must have had at least 1 no good coil) so i have a brand new set in now

Might gap the plugs a bit lower next time to be safe. Although its only a street car and havent really had any dramas before on 0.8

How long did they last if you don't mind me asking?

[89CAL]

7 years. Ive always run a valley cover and my engine bay gets quite hot now so i think they failed a little early because of that

[admS15]

^cheers, thanks for the reply.

[deprived777]

update on the ebay dude:If it is a faulty coil then it would only be 1. It wouldn't be all 6 at the same time.

This alone is an extremely rare occurrence as a lot of care goes into these coils during the manufacturing process.

We will need isolate the single faulty coil though so it can be replaced under warranty.

Thanks.

whats my reply going to be ? should i go for replacements or keep insisting on a refund. to me replacing them is more hassle and seems a waste of time if they're going to keep failing