R34 Break Down Problem :(

[ian_and1]

Ok

Cut a long story short, im having problems with my R34 at about 4800rpm+ it starts to stutter and break down.

now ive read this thread

http://www.skylinesaustralia.com/forums/Mi...500-t32356.html

pulled out my coils etc most of them were arked etc so i replaced them with a new set

now i did this on friday and it was ok for the day now it's doing it again it currently has platinum plugs and for some reason i think the mechanic gapped them at 1.2 :S now that seems a lil big, can any-1 confirm if they should be at about 0.8 and could that cause the break ?

[tridentt150v]

yep, reset to 0.8 and you'll be fine

[ian_and1]

well at 0.8 now still doing it, should i try and chang the plugs ?

running out of idea's what it could possible be , dunno if this helps but it's running FMIC, turbo back exhaust, KKR430, super spark coils (car has done this be4 these mods were done) and sometimes like ill be cruising in say 3rd you can here it sort of miss type of sound and can feel/hear it, on idle some times it will miss and back fire sometimes between gear changes

[ClutchBurndout-:(]

could your injectors be dirty? sounds like theres not enough fuel coming out of them, tried running a injector cleaner through? its a long shot but worth a try.

[ian_and1]

yeah have done a purge (think that's how it spelt) some-1 said possible fuel pump ? but then i dont know why it wouldn't do it some times but other times it would ? could it be the ECU ? it's hard to explain it over the net today i poped into town then got back to my car turned it on started to idle drop revs pick them up again etc :S then i drove and it stopped it

Edited December 1, 2008 by ian_and1

[ian_and1]

when driving for example 3rd doinh 60km and just let your foot of the pedal makes sort of a baffling sound :S

[ClutchBurndout-:(]

yep, had the same problem as that, did u recently install a pod or adjust any airflow? if so, the ecu should soon adjust istelf, as mine did!

[tacker]

sounds like fouled plugs but that would only be under load not on lift off.

[ian_and1]

ok now if i drive the car dont floor it just slowly incrase my speed the tacho goes all the way up to 8000RPM, but as soon as i boot it, it does it again ? fuel pump or something to do with the fuel line maybe ? it's going on the dyno next week to see WTF it's doing also changing plugs over the w/e

[666DAN]

What are super spark coils???? Why are so many people just not getting 'tried and tested' Splitfires? They're not even expensive anymore and work no questions asked.

You've defiantely got a missfire there, what you're explaining I can only achieve with moisture in the cam valley....or when I didn't have splitfires.

[ian_and1]

What are super spark coils???? Why are so many people just not getting 'tried and tested' Splitfires? They're not even expensive anymore and work no questions asked.

You've defiantely got a missfire there, what you're explaining I can only achieve with moisture in the cam valley....or when I didn't have splitfires.

http://www.skylinesaustralia.com/forums/Su...ks-t228296.html

http://www.superspark.com.au/

didn't want split fires, all i wanted was a cheap replacement coil wasn't at looking at getting a high performance set. also another thing is that super sprak offer 60 day warrenty

[cosmic starz]

you have'nt given the most important infor - do you get an emgine warning lite and the code it is flashing or not?

if its coils or ecu you would get the code flashing

problems like you describe unless related to loose connections would point to air or fuel not in correct ratio at high revs when booted hard obly as you say a slow rev up is OK - so make sensible guesses as to why the ratio is wrong at high boot up (e.g. fuel pump cannot deliver enough fuel quickly - blocked, worn , and maybe filter clogged etc)

and read the R34 Manual if necessary

[ian_and1]

you have'nt given the most important infor - do you get an emgine warning lite and the code it is flashing or not?

if its coils or ecu you would get the code flashing

problems like you describe unless related to loose connections would point to air or fuel not in correct ratio at high revs when booted hard obly as you say a slow rev up is OK - so make sensible guesses as to why the ratio is wrong at high boot up (e.g. fuel pump cannot deliver enough fuel quickly - blocked, worn , and maybe filter clogged etc)

and read the R34 Manual if necessary

no engine warning light does not come on, im starting to think that it is fuel related under load