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Rb26 Misfiring On Boost

Turbz_13

By Turbz_13,
in Engines & Forced Induction

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Rolls Grand Master

Rolls

Posted
Posted

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

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Rolls Grand Master

Rolls

Posted
Posted (edited)

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 by Rolls
DVS JEZ Grand Master

DVS JEZ

Posted
Posted

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 Mentor

Deano 1

Posted
Posted

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?

Deano 1 Mentor

Deano 1

Posted
Posted

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.

Deano 1 Mentor

Deano 1

Posted
Posted

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

Deano 1 Mentor

Deano 1

Posted
Posted

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

Nee-san Grand Master

Nee-san

Posted
Posted

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 Experienced

Turbz_13

Posted
  • Author
Posted

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...

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