Rb26 Misfiring On Boost

[Rolls]

Yeah, money is no problem is just the booking in and waiting etc I suppose ill have to if i cant track it down.

No one thinks gasket ?

an exhaust leak post turbo would just make it noisy, pre turbo would also be noisy but could cause boost to drop, neither would make it run rich or misfire though

[impact_blue]

leaky injector?

[Rolls]

leaky injector?

never heard of them leaking into the cylinder, I guess its possible though.

other thing to check is if you have a rising rate regulator that the lines haven't fallen off, however that would probably make it lean I think, not rich.

Edited January 24, 2011 by Rolls

[DVS JEZ]

pull the spark plugs and post up a pic of them all, keep a note of which cylinder is which.

[Nee-san]

Ok, Will do but as i checked them last time they were all covered in black fuel soot.

[DVS JEZ]

Are they all covered exaclty the same? If so that rules out a leaky injector.

Then u need to do a pressure or smoke test on the entire intake system from airflow meter to inlet manifold.

Just for a quick look if u can check on the fc hand controller in settings and airflow make sure its still set on ur current airflow meter. If theyre stock then it should be on stock. If z32 then on vg30 etc. Its an easy thing to accidently change and sometimes will still run but tune is waay off.

If the intake is all sealed up then the dyno is the next best bet. Give ur tuner some new plugs so he can run it up on the rollers with fresh plugs. So let him putt hem i. Just before he runs it.

[Deano 1]

It sounds like Lean pop to me, if it's only soon it as it rolls on boost, check the fuel pressure after the filter, I'd just replace the filter for the sake of it. Is the car running stock boost?

[DVS JEZ]

Deano when ur s13 fuel pump was dieing and lean popping do u remember if the plugs where sooted up from off boost driving?

I think the op said he can see alot of black smoke when its misfiring

[Deano 1]

It never realy got off boost driving, it was just short bursts up and down my street, the plugs were dark but I think that was because I had that stupid fuel tank breather plugged into the TB lol. Once you found that prob, than it was missing just a's it rolled on boost, the main way I found out it was lean poping, was I turned the boost down from 16psi back to stock, and it got alot better. Hardly did it at all, that's when I realised it was lack of fuel, and a during fuel pump was to blame.

But in saying that if I would have changed the plugs after we change the TB plumbing I'd say the plugs would have gotten light coloured.

[DVS JEZ]

Haha oh yeah forgot u did that with the breather. I suppose thats 1 way of getting more fuel in the engine without bigger injectors. Haha just let the engine suck it from the fuel tank lol.

[Deano 1]

Haha oh yeah forgot u did that with the breather. I suppose thats 1 way of getting more fuel in the engine without bigger injectors. Haha just let the engine suck it from the fuel tank lol.

Lol we should do that with my gtr next time it's on the dyno.... Save me heaps of cash on injectors. Bahahaha

[Rolls]

It would only suck fuel (more likely fuel vapour) on vac, on boost it would either leak boost into the fuel tank or if its a one way valve do nothing.

[Deano 1]

Yea it was sucking vapour, it was just running mega rich and backfiring when you lifted your foot. Like a big back fire lol 1 meter flames, like a gun going off. Haha it blow the middle muffler from the inside out hahaha broke all the little tac dipple welds holding it together. I learnt my lession there hahaha

[Deano 1]

Double

[Rolls]

it probably just ran rich from the boost leak but i imagine sucking petrol vapour on the overrun would make some pretty sick flames

sounds like a sweet mod to do to a shitbox

Edited January 25, 2011 by Rolls

[Nee-san]

Are they all covered exaclty the same? If so that rules out a leaky injector.

Then u need to do a pressure or smoke test on the entire intake system from airflow meter to inlet manifold.

Just for a quick look if u can check on the fc hand controller in settings and airflow make sure its still set on ur current airflow meter. If theyre stock then it should be on stock. If z32 then on vg30 etc. Its an easy thing to accidently change and sometimes will still run but tune is waay off.

If the intake is all sealed up then the dyno is the next best bet. Give ur tuner some new plugs so he can run it up on the rollers with fresh plugs. So let him putt hem i. Just before he runs it.

All are covered the same.

I think I may have a couple of gaskets which are pretty much f**ked, ordered new ones from nissan.

Will check the intake.

[Turbz_13]

more about my car, has a new fuel pump. plugs are 1500kms old(not gapped to .8), new oil. and its running a haltech so no afm and on o2 sensors!!

althought i blew a hose and covered the pods in oil and i had a few inlet hoses off the other day and saw alot of oil in there. so looks like turbo to inlet manifold pipes will have to be pulled out and cleaned out from all the oil

i was gonna check th igniter module.

i think i have a bad grounding in the engine but...

[DVS JEZ]

Try gapping them down a bit ^^^

[Rolls]

Buy pre gapped new plugs at 0.8mm, theres a reasonable chance it will fix it.

[Nee-san]

Just updating my silicon joiners arrived today and they fixed the problem, 100% goes like a rocket now, unfortunately it has started to blow blue smoke on boost.