illusiVe Posted September 20, 2006 Share Posted September 20, 2006 my search came up with lots of topics on how to remove, but not if its bad for engine/turbo etc. my R34 GTT is on 10psi with stock turbo, just recently under heavy acceleration it seems to missfire asif traction control is on (which it isnt) and i get lovely pop pop pop pop noise (while accelerating) towards redline, happens occasionally not consistantly.. could this be the R&R i've heard so much about? but why havent I had this issue before today?.... Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/ Share on other sites More sharing options...
mad082 Posted September 20, 2006 Share Posted September 20, 2006 rich and retard isn't a popping sound. it is just a dead stop in power. it sounds like you have ignition issues, like a dud coil or spark plug. this isn't that bad as it isn't really doing anything except not sparking. it would actually be cooling the cylinder that isn't firing. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2512517 Share on other sites More sharing options...
illusiVe Posted September 20, 2006 Author Share Posted September 20, 2006 ok, so more of something i can still drive with.. but nothing that needs imediate attention.. tis good cause i have no money Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2512525 Share on other sites More sharing options...
mad082 Posted September 20, 2006 Share Posted September 20, 2006 have you diagnosed as to what the problem is? also if it is only under hard acceleration, just don't acellerate hard until it is fixed. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2512561 Share on other sites More sharing options...
r33_racer Posted September 20, 2006 Share Posted September 20, 2006 could be a slight leak somewhere in the piping. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2512890 Share on other sites More sharing options...
Haxorz Posted September 20, 2006 Share Posted September 20, 2006 I'd bet it's exactly what I had... check this thread. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2514320 Share on other sites More sharing options...
illusiVe Posted September 21, 2006 Author Share Posted September 21, 2006 i put boost to 11psi, doesnt happen anymore.. no farken idea. it almost sounds like a rev limiter so it might pop every .3 seconds under the hard acceleration, then just stops. power seems to die for the .3 seconds, or whatever, boost holds. either way, problem gone for the moment. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2517035 Share on other sites More sharing options...
chrissso Posted September 21, 2006 Share Posted September 21, 2006 Hmm, I'd go to the dyno and get your fuel ratios checked. Popping is most commonly because its too rich. Rich mixture is harder to ignite. Then the mixture is burnt after it has exited the cylinder giving a pop. Usually caused by the air flow metre detecting too much airflow, (usually from intake mods like fmic and pod). The EUC adds not just a littlle more fuel, but a lot more. Too much infact as it thinks the excess flow is a problem. I regard to the issue going away after the boot rise... I can't say for r34's, but with 33gtst's, it would seem that the fuel pump only supplies enough fuel for std boost. Your poping might have gone on higher boost because your fuel pressure might be dropping, and themixture is coming back to lean, or at least closer to where it should be. Anyway, there are 101 answers to this. IMO minor popping, as long as it is a minor misfire is not going to cause imidiate problems. However, if it is running rich, and you don't do something about it, then you risk other issues like cat damage and washing the bores. Best best, get it checked on the dyno and then talk to the tuner about a course of action. Most probably ECU, maybe a fuel pump. Chriso Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2517128 Share on other sites More sharing options...
Guest 40th-edition Posted September 21, 2006 Share Posted September 21, 2006 unburn fuel will damage the cat if it gets to much.. other wise miss shouldnt have any detrimental affects.. it will also use more fuel Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2517176 Share on other sites More sharing options...
psybic Posted September 21, 2006 Share Posted September 21, 2006 (edited) Wow, I was JUST about to add about richness damaging the cat. Good point! I have experienced an engine running way to rich and damaging the cat in a 3SGTE, which has the cat IN the DUMP PIPE! Stupid place I know, so more prone to getting damaged I guess... but yeah, amazing how much power you will be loosing if you are both running rich AND have a blocked cat. I went from 62fwkws to 125 fwkws on that car with hi flow cat + retune. Edited September 21, 2006 by psybic Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2518674 Share on other sites More sharing options...
Nozila Posted September 21, 2006 Share Posted September 21, 2006 then you risk other issues like cat damage and washing the bores. cat damage i undertstand, but 'washing' the bores? i didnt know this was possible. my understanding is that running rich only cause rediculous fuel consumption (blocked o2 sensor) and damaged/blocked cat. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2518728 Share on other sites More sharing options...
RB20_ZED Posted September 22, 2006 Share Posted September 22, 2006 unburn fuel will damage the cat if it gets to much..other wise miss shouldnt have any detrimental affects.. it will also use more fuel is damaging the cat really that bad a thing? wont it just start to become a "high-flow" cat? Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2519380 Share on other sites More sharing options...
illusiVe Posted September 22, 2006 Author Share Posted September 22, 2006 last dyno showd AF was very rich, even when on stock... Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2520579 Share on other sites More sharing options...
RB30-POWER Posted September 22, 2006 Share Posted September 22, 2006 is damaging the cat really that bad a thing? wont it just start to become a "high-flow" cat? ahh, no... it melts and causes a major restriction or blockage in the exhaust system, not what you want. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2520739 Share on other sites More sharing options...
Rolls Posted September 22, 2006 Share Posted September 22, 2006 (edited) i put boost to 11psi, doesnt happen anymore..no farken idea. it almost sounds like a rev limiter so it might pop every .3 seconds under the hard acceleration, then just stops. power seems to die for the .3 seconds, or whatever, boost holds. either way, problem gone for the moment. Id say its a spark problem, weak coils possibly not causing a powerful enough spark. The higher boost level is blowing the spark out. Try gapping your plugs down (requires less energy for the spark) Also 11psi is as high as you want to boost the stock turbo. It wont last much longer above this level. Its a very common problem, usually coil/sparkplug related. However it could be something else. Read all about it here http://www.skylinesaustralia.com/forums/in...showtopic=32356 Edited September 22, 2006 by Rolls Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2520858 Share on other sites More sharing options...
scags Posted September 22, 2006 Share Posted September 22, 2006 I had the same symptoms about a month ago with my R34 - misfirung under load at aroung 5krpm. Turned out to be the Fuel Pump. Replaced with bigger one (after a headache removing my Amplifiers to get to it) and walla - all fixed. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2521243 Share on other sites More sharing options...
illusiVe Posted September 23, 2006 Author Share Posted September 23, 2006 ahh, no...it melts and causes a major restriction or blockage in the exhaust system, not what you want. just keep melting it until its nolonger there Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2521920 Share on other sites More sharing options...
RB20_ZED Posted September 23, 2006 Share Posted September 23, 2006 ahh, no...it melts and causes a major restriction or blockage in the exhaust system, not what you want. i guess ur assuming that when it melts u turn the car off and let it set... my guess is that the melted bits will be blown out the arse of the car. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2522146 Share on other sites More sharing options...
RB30-POWER Posted September 23, 2006 Share Posted September 23, 2006 what happens in reality, is the cat will usually break apart into pieces that are too large to go out the exhaust, but they block the outlet in the cat, (exhaust pressure pushes the loose bits to the outlet of the cat causing restriction) and your car doesn't make much boost/power due to the restriction and it can't melt further because the exhaust temps dont get high enough, because the vehicle isn't making any power. the above has happened on almost all vehicles i have changed cats on, and they aren't all performance vehicles either. Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2522210 Share on other sites More sharing options...
D-limo Posted September 23, 2006 Share Posted September 23, 2006 Remember a fault in the ignition (if its intermitant) will usually rear its ugly head when the car is under full operating temp... Link to comment https://www.sau.com.au/forums/topic/135081-does-mis-fire-actually-damage-anything/#findComment-2522244 Share on other sites More sharing options...
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