ABuSD Posted January 30, 2004 Share Posted January 30, 2004 Yeah my mates reckon it could b that (looks like mines already been changed) or a sticky valve. If its your crank angle sensor will it rob u of power, and im talkin of a fair chunk here!!(guessing 50 or so rwkw) Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-665249 Share on other sites More sharing options...
Abo Bob Posted January 30, 2004 Share Posted January 30, 2004 well i think so because it's now chirping at the top of 1st gear (tiptronic) and it never had the power to do that before. Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-665819 Share on other sites More sharing options...
ABuSD Posted January 31, 2004 Share Posted January 31, 2004 sweet ill let yas know how i go! Cheers Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-666903 Share on other sites More sharing options...
Abo Bob Posted March 22, 2004 Share Posted March 22, 2004 Well rather than edit... Changing the CAS just coincided with a few days of running fine. It was the coil packs after all. Now have some nice Splitfires in there. Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-736347 Share on other sites More sharing options...
SLY33 Posted June 18, 2004 Share Posted June 18, 2004 developed a pretty bad miss from 4grand up, well its more like a rev limiter sound after 4 grand! other than that it drives normal. Suspect its a coil or even 2 coils seeing as the miss is so bad. I was recently told that hitting the rev limiter frys the coils, i did not know this, and the car usually hits the limiter regularly... after reading this thread i pulled out all the coils and had a look, the one closest to the firewall has a very fine crack as is the topic of the thread. i took a picture but the crack is that fine, i had to struggle to identify it, but running my nail over it you can feel it. All other coils appear fine. you cant really see the crack in the pic, but the arrow shows where it is. it runs vertically about 3-4mm and starts underneath the raised numbers on the coil pack. Im still not 100% sure its a crack, as it looks like a mould/cast mark or something, but none of the others have it so i guess it is a crack.... im off to buy some insulating tape to wrap it up. Ill let you know if it fixes the prob! 1 Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-896599 Share on other sites More sharing options...
SLY33 Posted June 18, 2004 Share Posted June 18, 2004 yeah the pic is crap, couldnt get the P.O.S. digi camera to focus close up.. Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-896605 Share on other sites More sharing options...
SLY33 Posted June 18, 2004 Share Posted June 18, 2004 well i am stoked! wrapped the bastard up and she runs perfect! its amazing how such a TINY hairline crack can cause it to run so bad! thanks nightman, if not for this thread i wouldnt have my car running so soon! Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-896708 Share on other sites More sharing options...
Revhead Posted June 19, 2004 Share Posted June 19, 2004 Will have to give this a go - mine runs fine as long as I'm using less than around half throttle. Once over ~4k, if I use more than ½ throttle, it does the rev limiter-like miss. Still managed to drag off an XR8 with half throttle and 8psi though Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-896951 Share on other sites More sharing options...
SLY33 Posted June 19, 2004 Share Posted June 19, 2004 revhead that sounds exactly like mine... just keep in mind when your looking that the crack(s) are tiny! let us know how it goes Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-897811 Share on other sites More sharing options...
Revhead Posted June 19, 2004 Share Posted June 19, 2004 Will do, planning on having a look today (Sunday). I'll post up whether it fixes mine too - here's hoping Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-897872 Share on other sites More sharing options...
benm Posted June 19, 2004 Share Posted June 19, 2004 Hrmm interesting thread. Last week (fri nite before the drags) I gave my car a squirt on 12psi just to make sure everything was running right (I never ever use 12psi, always 7psi for daily driving) and I was shocked when I got this miss/cut at 4,500-5,000rpm like mentioned in this thread. At first I thought it may have been a fuel surge as I was getting low in fuel so I filled it up and still had the miss. Then I replaced the stock air filter with my K&N (it's dirty thats why it wasn't in the begin with) and still had the severe miss. So for the past week i've been meaning to check the spark plugs (haven't checked them in the past 47,000km however UAS regapped them to 0.8 about 3mths ago and said they were fine). I've had the plastic cover removed for about 3-4mths too just to let out heat quicker. Maybe I damaged the coils at my last track day a month ago. I might put aside a few hours tomorrow to have a play around with this coil thingo if I have the right tools. I'm still not sure where/what to tape up tho? Is the tape to hold it together tigher or. . . ? Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-897888 Share on other sites More sharing options...
R33vit Posted June 19, 2004 Share Posted June 19, 2004 Hrmm interesting thread. Last week (fri nite before the drags) I gave my car a squirt on 12psi just to make sure everything was running right (I never ever use 12psi, always 7psi for daily driving) and I was shocked when I got this miss/cut at 4,500-5,000rpm like mentioned in this thread. At first I thought it may have been a fuel surge as I was getting low in fuel so I filled it up and still had the miss. Then I replaced the stock air filter with my K&N (it's dirty thats why it wasn't in the begin with) and still had the severe miss. So for the past week i've been meaning to check the spark plugs (haven't checked them in the past 47,000km however UAS regapped them to 0.8 about 3mths ago and said they were fine). I've had the plastic cover removed for about 3-4mths too just to let out heat quicker. Maybe I damaged the coils at my last track day a month ago. I might put aside a few hours tomorrow to have a play around with this coil thingo if I have the right tools. I'm still not sure where/what to tape up tho? Is the tape to hold it together tigher or. . . ? Ben if your not sure, bring it to my place and I will help you with it Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-897903 Share on other sites More sharing options...
SLY33 Posted June 20, 2004 Share Posted June 20, 2004 the tape just has to cover the crack, it doesnt have to hold it together as the crack wont be that bad, its just to insluate the coil pack as where the crack is the spark jumps out. look at my picture on page one, where the arrow is, you just wrap the bottom half of the pack below the magnet/metal square part, to where the rubber boot goes on. I pulled off my boot, taped it, then squeezed the boot back on so the boot helps hold the tape. Dont wrap too many times like i did at first, as the coil pack didnt fit back in! Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-898667 Share on other sites More sharing options...
SLY33 Posted June 20, 2004 Share Posted June 20, 2004 btw you only need basic tools, some sockets etc, wrap the tape along the direction of the arrow on my picture, horizontally round the bottom half of the pack... assuming you find a crack that is! but it sounds like the problem... i thought it was my plugs too initially, but they were all still at a perfect 0.8 gap. Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-898673 Share on other sites More sharing options...
Revhead Posted June 20, 2004 Share Posted June 20, 2004 Update on mine: I found that every single one of my coils had that hairline crack. I taped up the coils, and the problem seems to have gone away, woohoo! Only problem I'm having is that the tape keeps falling off once I get a bit of heat into the engine, so I hit the coils with a bit of insulating gasket maker (the sensor safe stuff), then taped over that, then put the coils back into the cradle with a small amount of cotton fabric in an attempt to hold the tape in with a bit of force, rather than relying on the adhesive. Seems OK now, will have to give it an extended test today Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-899224 Share on other sites More sharing options...
SLY33 Posted June 21, 2004 Share Posted June 21, 2004 thats great that its fixed the problem, but the tape should really be seen as a stop gap measure until you can replace the coils! how about plastic welding?! the coil pack plastic is obviously very resistant to heat but i might just hit the crack with a soldering iron and see if it will melt the crack shut, talk about backyard techniques! But i have a couple of brand new coils on the way anyhow... Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-900218 Share on other sites More sharing options...
Revhead Posted June 21, 2004 Share Posted June 21, 2004 Of course it's only a temporary fix, I'm not that dodgy I'd always planned on getting some Splitfires or something in there (investigated MSD but was going to cost ~$1.5k!!). It's misfiring again though, so I might rip em out (again...) and try to plastic weld them too. I just have to find something that won't blow the coils to pieces! I could always hit them with the oxy... Nah just kidding, here's the plan though: I don't know whether the soldering iron I have will get hot enough, so I'll get an old screw driver, grind it down to a sharp point, wrap the handle in rags, and heat the fark out of the screwdriver with the oxy. That should make it hot enough to melt some plastic from an old distributor cap/coil/something that's lying around the workshop onto the end of the coils. One other note with mine - the cracks had actually started to make their way up the bit that the spark plug sits in, making it really difficult to get a decent seal. If I get a chance/could be bothered I'll whip out the camera and try to get some shots. Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-900677 Share on other sites More sharing options...
SLY33 Posted June 22, 2004 Share Posted June 22, 2004 i was also thinking, would some silicone glass sealant work? It would be so easy to smear a layer over the crack, or even use it as glue to stick some other material over the crack. would the spark jump through a layer of silicon?! if the soldering iron thing doesnt work, ill try the sealant. does anyone know where you go to get propper plastic welding done? being so small and considering that appearance doesnt matter, i dont think it would cost much... Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-901725 Share on other sites More sharing options...
|PRESA| Posted June 24, 2004 Share Posted June 24, 2004 I been running 10psi nicely for awhile now.. till a couple hours ago i put in an apexi pod filter and its the first time my machine is miss firing. It started missing at just over 6,000revs then began to get worse, now misses at 4,500revs. This all happened in a matter of about half and hour of driving. You guys really think its the coils? If so how much are a set of these Splitfire coils? Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-906158 Share on other sites More sharing options...
GTST33 Posted June 27, 2004 Share Posted June 27, 2004 Hi guys how much do new coil pack generally cost for R33s, and where is a good place to get them with not getting ripped off. Thanks Link to comment https://www.sau.com.au/forums/topic/32356-missfire-boost4500-5500-rpm-the-answer-for-me-at-least/page/2/#findComment-909614 Share on other sites More sharing options...
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