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R33 Gtr Missing At High Rpm... Possible Causes?

nuci_gtr
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nuci_gtr Enthusiast

nuci_gtr

Posted
Posted

Hey all,

My gtr has had this issue since I bought it, it drives fine when kept under about 5000rpm, but above that it sounds like it's missing or something.

I've done a bit of research and some people say it could be a coilpack/ignitor issue, others say coilpack harness, or that it is just leaning out at the top end and that an ecu and tune will fix it.

Drives completely fine even at wot under about 5000rpm, and on some occasions it will rev out to redline nice and smoothly. Has an intake, 3.5" exhaust, stock ecu and some sort of blowoff valve (came with the car :s).

Any ideas? Just don't wanna shell out big $ for a haltech or something when it could be a much simpler, cheaper fix. Any help greatly appreciated. Cheers.

owen1r Collaborator

owen1r

Posted
Posted (edited)

It won't be the car leaning out.. You won't need an aftermarket ECU to fix this.

Borrow a mates coilpacks/ignitor/loom and see if it fixes it, no need to shell out for new splitfires ect if it isn't the issue.

I would recommend you get rid of the BOV.

Edited by owen1r
KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Simple solutions first. Have you replaced the plugs and gapped them down to 0.8mm? I would suggest returning to stock bovs but you probably don't even have the piping let alone the bovs. Not to say that yours is faulty - try to find out what it is.

If your coils are the originals its quite possible they are on the way out but you could try a thorough clean and spray with liquid insulation - there is a good "how to " somewhere.

Same with the fuel pump. Can you access a fuel pressure meter?

If it is stock (apart from the bov) you shouldn't need an aftermarket ecu although it would be nice.

nuci_gtr Enthusiast

nuci_gtr

Posted
  • Author
Posted

I have also noticed that under hard acceleration that on some occasions the fuel light pops on for a second or two, even on a full tank. Could this be fuel pressure related? I raised the issue on here a whole back, most people said it'd just be a dirty float in the fuel tank or something harmless.

I don't have a fuel pressure meter, I could take it to a shop but when I'm asking them to help me with an issue I have limited knowledge on, I can just see that they'll see me coming and I'll be replacing parts that have nothing wrong.

But I might start with the spark plugs and coilpacks, just wanted to get a few opinions first.

Ben C34 Grand Master

Ben C34

Posted
Posted

Could be anything.

But more than likely is the most common cause ever discussed on this forum. Coilpacks.

Seriously, they are old,along with everything else in the car.

Or your car could be an absolute piece of shit. Hard to say from here.

nuci_gtr Enthusiast

nuci_gtr

Posted
  • Author
Posted

Just an update, fitted new splitfires and ngk spark plugs gapped at 0.8mm and the misfire is gone. Revs out to redline nice and smooth, no hesitation or backfires or anything. Thanks to those who made a positive contribution, that's what these forums are all about.

And hey I guess I'd rather pick the kids up from school in a stagea than a tarago ;)

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