harks

98 ron. i guess i had ruled them out thinking it was all down to a coil problem, which evidently is not the case! ill inspect them later in the week.

True. I didnt want to come across like i had my finger on exactly what it was, because i evidently have no idea what the issue is. I made the previous comment becuase from my observations and limited mechanical knowlegde, it seemed illogical that one day the tune could start a problem after 1500km of perfect running (after the cam install), then after a temp fix make the problem after only a few dozen km.. if the tune is the broken variable it doesnt add up. It will be getting looked at though.. my issue now is limp it to canberra or tow it to melbourne because wagga is lacking in tuners/performance workshops.. hence trying to explore alternatives that dont require flying in and out of wagga to get it sorted again, thanks for your input guys, i do appreciate it.

The tune was looked at by the workshop after the cams were installed.. but it had very limited dyno time and just had some minor ignition adjustments made. still, it has done over 1500km since the poncams before any issues began.

Yes, because the car has done around 10,000km on the tune before any issues came up. Has done Bris to Melb and back in straight drives twice in the last 5 months.

This thread is actually providing me some useful insights on my current tune. thanks for starting it Zoom Zoom. Looking at my AFR and IGN tables they definitely need some tweaking.. my AFRs are down to high 12s by 30- 50kpa on the Y Axis. judging by the comments about being closer to stoich at cruise im confident that some changes can be made there. my ignition table looks a bit wierd too, i think it may need some serious work. When i get my laptop sorted ill post up my AFR and IGN tables for reference

Okay this is REALLY frustrating me! I replaced coilpacks and pulld out the plus to inspect (performance has deteriorated to almost vonstant missfire regardless of boost or not) the plugs having only done 300 or so KM since change were horrible. See below No 1. Cyl No 2 and 3 (all others are exactly the same) As you can see.. they are in bad shape, and the car drives very very poorly... I am now at a loss. there must be an issue with a sensor thats causing the issue.. any ideas? cheers Dan

Good on you for taking a chance. Should provide some interesting results for people down the track. Any idea when tuning/dyno will be?

Price drop! GT SS's - $850 -7s - 8800 R33 Kakimoto regu06&R catback 3.5" $400 Sard 700cc injectors $320 Stock fuel rail and injectors $70 feel free to make an offer. GTRR, airbox is gone GHO5T, yeah mate.. i can message them to you, PM me your number or email and i can send you pics of any angle you want. currently its wrapped up ready to post but i'll rip it out and take soem more for you.

Yeah, despite them being drop in, i was of the undertsanding that anything modifying head performance effects the volumetric efficiency of the engine. So on a MAFless set-up which to my understanding during tuning with a wideband sensor calculates VE so that it can work without the MAF, would mean that the head is flowing a different amount of air to what it thinks it is if not correctly adjusted after installation, so despite the ECU "thinking" its at a 11.8 AFR at WOT, it may infact be 10.2 or something. Although i dont think a poor tune could make the car so rich it fouls the plugs within an hour and almost kills the car. especially since i have done about 1500km on the tune without an issue. I had to go for a 200km drive back home today and by the end of the drive the missfire was incredible. SO, i'm back to purchasing an entire set of splitfires and replacing them on arrival. I suspect if i was to pull out the spark plugs they would be fouled again. so i'll need to give them a good clean when i replace the coils. I just think that it may only be 1 or 2 that are bad.. but if 1 or two have gone, whose to say in 3k km another might go, atleast if i do them all i know they will be good to go. If the coils doesnt fix it(which i suspect it should), then it may end up being injector related. as you suggest Blackkers, but the missfire i suspect is an issue for more then 1 cylinder. But i have no way of checking that, and im not sure i trust any mechanics in wagga to diagnose the issue!

Quick update: I managed to get the plugs out today and cyl1 was quite lean, the others were all black.. I put a set of NGK BCPR6ES plugs in and an instant95% improvement!!!! There is still a hint of hesitation at 3.2-3.4k rpm, which leads me to think a single coil is playing up, or an issue with the tune not getting properly modified when my poncams went it. I'll put some photos up when I get a chance.

Funnily enough I have a cas at home that was reading a bit of variation so I've replaced it.. I'll check part number for it on Sunday.

Thanks for the points. I've never had misfire before, but it just started so so gradually, and progressively gotten worse, I would have thought a spark plug would be fine or broken, (although carbon build up or something I guess could be the issue of not gap it's) and a coil would have greater scope for deterioration..? Wondering if I just bite the bullet, buy new coils and plugs, and a better tool and replace both next week after Easter weekend?? And anyone know where to get a quality plug remover tool in wagga??

well, i watched the video, got the coilpacks out. tried to remove the first sparkplug.. it was so firmly in it snapped the metal crossbar on the tool before i could break it.... I figured well... i might aswell clean up the coils, dielectrical grease em etc.. all coils appear fine. put back together... same problem. so possibly an actualy spark plug issue. they SHOULD be 15k old. any tips for getting em out if they are rock solid stuck?? plus, what is the likelyhood of it being a spark plug issue vs a coilpack issue? this may quickly become something ill need to wait untill i can get to melbourne to have good workshop look at

Ahh okay, I'll have a look at it and see if i have time to inspect them tomorrow after work

um, no, theyre not pillowball. and unsure if the bushes have all been greased, could a creaking be as easy a fix as some greasing?