Hesitating And Splurting Problem R33 Help Please4

[jack-95-rb25]

95 r33 single turbo skyline when i take the revs up around high 3- 6 thousand range it starts to hesitate and splurt and carry on then once its gone through that it takes off, sometimes it can continue on longer and others times not.. im not sure what the problem is..

When i bought the car the o2 sensor had been disconected and cut off, we dont no why they would of done that so we reconnected the o2 sensor and since then the hesitating has got worse?

Does it need a tune, pcm playing up?

Not getting enough fuel or too much?

I've changes all plugs leads, besides that the car runs smooth.

Any help would be much appreciated.

Jack

[R31Nismoid]

If you reconnected and it got worse, the O2 is stuffed... hence it would have just been disconnected.

Really doesnt do much anyhow (if using aftermarket ECU)

You dont have leads on an RB, so not sure how you changed those exactly

What other mods?

Sounds like a normal case of bad coil packs, incorrectly gapped copper plugs or the lucky last of rich and retard (stock ECU having a fit due to mods other than factory). Could be either one or a combination of some

[jack-95-rb25]

If you reconnected and it got worse, the O2 is stuffed... hence it would have just been disconnected.

Really doesnt do much anyhow (if using aftermarket ECU)

You dont have leads on an RB, so not sure how you changed those exactly

What other mods?

Sounds like a normal case of bad coil packs, incorrectly gapped copper plugs or the lucky last of rich and retard (stock ECU having a fit due to mods other than factory). Could be either one or a combination of some

Yeah im not sure what anyone had done previously to the car, but since i have had it i have put and upgrade to the intercooler and lifted the boost about 2 psi.?

I think your rite with the ecu been the problem.. i changed the spark plugs not long ago with uridium style ones.. i might have to do the coil pack next???

[R31Nismoid]

Well iridi's are a waste of cash mate and they foul easily (if the car is running rich, that could be your problem in stuffed plugs again)

So pull them out and have a look first, if dead put coppers in.

Coil packs, possibly... but the problem doesnt usually "go away" in upper RPM, but then your boost might be dropping off and that could be a reason potentially also (have you had it on a dyno???)

[jack-95-rb25]

No i havn't had it on the dyno at all since buying it. Where i live in the Northern Territory the closest place is 500km away and i have heard bad reports on that place from alot of people, so the next closest place would be darwin. 1100km away.

When i change the spark plugs they didn't seem to be showing of any fuel running rich.

The boost dropping off would that be for turing up the boost a few psi? how would i check or find out it was that.?

[R31Nismoid]

Map the boost pressure vs rpm, suppose it could be done via your eyes?

Only way (really) is a dyno to be honest, you could probably buy some logging tools and what not but its going to cost some coin and for single use its kinda silly in a way.

Then you cna check AFR's also, just a few basic things that help determine where the problems are (or are not to rule things out)

Did the plugs show anything else? Plugs do tell some interesting stories

Check the coil packs one by one for hairline cracks, if they have some then they will me arc'in and causing missfiring

[jack-95-rb25]

Wouldn't the coil pack make the problem happen all the time? not just at high revs?

Map the boost pressure.. what should it be reading at what rpm?

[RubyRS4]

NT?

I had to sell my Celica ZR years ago because there was no premium (hi octane) unleaded for sale up there.

If you're running standard unleaded, thats half your problem.

I say run premium (or use octane booster) and fit a new O2 sensor.

[jack-95-rb25]

We have tried that, 98 octane and ab gas, still the same i seem to think it's the ecu, needs to be tuned for the little mods that have been done

[r32-25t]

its coil packs for sure

buy some split fire coils and be done with it

[Sloane]

yeh i had exact same problem.

it was due to the coil packs needing replacment.

i recommend splitfires too.

[turbs33]

lol, haha read my recent post before spend 400 on splitfires "about to fork out on splitfires"..

put new bcp6es plugs in.. if its still a issue then look toward coils..

dont know about u bout 400-500 anit just pocket money to me!!!

[jack-95-rb25]

Im going to order some new splitfire coil packs for it hopefully that will solve the problem.

Thanks for the help everyone

I just found this thread what do you all think about that?

http://www.skylinesaustralia.com/forums/Pe...ix-t216342.html

Edited April 25, 2008 by jack-95-rb25

[Craved]

We have tried that, 98 octane and ab gas, still the same i seem to think it's the ecu, needs to be tuned for the little mods that have been done

you put leaded petrol in your car? AV gas is leaded

thats a bad idea considering you havea catalytic covertor

[jack-95-rb25]

My brother did that i only just found out it was mixed with 98 and ab gas.. it won't happen again hehehe.

I talked to the mechanic up this way about the coil problem as he has had very little to do with the turboe skylines he said that if it was the coil pack it would be playing up all the time not just at high revs? can anybody shed some light on the coil pack issue.

[jkotsa]

Hi there i have the same problem when pushing the car past 4500rpm.my car has the following mods:BOV3inch fUJISUBO catback exhaustboost 9psipod filter.iridium spark plugs 0.8mmi had a 3inch exhaust before with holes in it (brand unkown) and it never used to back fire like that.now that i have replaced it with a 3 inch catback it is splurting.any ideas might change the plugs first?

[jack-95-rb25]

I've been told its the coil pack mate i have not yet tried that but im looking into it.

I was wondering if there's anyway to test the existing coils, or how to check for damages. I was reading in another thread something about the cracks on the coils.. where would they be located if there's any? on what part?

[jack-95-rb25]

anyone?

Edited April 30, 2008 by jack-95-rb25

[Craved]

there are a couple of threads for cheap fixes to coil packs

as it revs you increase the air into the motor and the fuel - the need for a stronger spark is now, hence the gremlin coming out.

[alwaysdreaming]

im currently having similar problems with mine, especially after boosting it to 9psi. under hard acceleration it seems to be reluctant to go most of the time and will then stutter. i was told it is most definatley my coils, and have also been recommended splitfires. my mechanic said it was because my rea coil was shorting, every now and then when the hood is up you can hear a spark sort of sound which is the short.

hope you figure it out,

will have my coils in a few weeks hopfully that does the trick.

peace