Jump to content
SAU Community

R34 Gtr - Missfire @ Approx 2500Rpm / Low Rpm

iwanta34gtr

By iwanta34gtr,
in General Maintenance

 Share

Recommended Posts

iwanta34gtr Grand Master

iwanta34gtr

Posted
Posted

Hi Everyone,

Getting a misfire / hesitation in my R34 GTR, at low RPM - approx 2500RPM.

Changed the plugs today and put in with NGK Platinums but its still there.

My initial thoughts are coil packs.

Is there anything else in particular that I should be checking or that could be causing the issue? (Injectors - etc)

Cheers in advance.

GTRNUR Grand Master

GTRNUR

Posted
Posted

I'll be different and say, virtually no chance at all its the coil packs.

You changed the plugs and it developed a miss. Therefore thats whats wrong.

Did you try your old ones again? Try that first and see how it goes.

What are the plug codes on the new plugs? I've used BKR6EIX with 22lb boost and 0.8mm gaps with stock coil packs, 470+hp atw no problems. If your tune is right they won't foul up.

Check you haven't left a hose clamp un-done if you also had part of the intake system apart recently. At 2500 RPM the turbo's start making a little boost. If you have an air leak post turbo's, it will run rich and can blow out the spark as a result.

iwanta34gtr Grand Master

iwanta34gtr

Posted
  • Author
Posted

I'll be different and say, virtually no chance at all its the coil packs.

You changed the plugs and it developed a miss. Therefore thats whats wrong.

Did you try your old ones again? Try that first and see how it goes.

What are the plug codes on the new plugs? I've used BKR6EIX with 22lb boost and 0.8mm gaps with stock coil packs, 470+hp atw no problems. If your tune is right they won't foul up.

Check you haven't left a hose clamp un-done if you also had part of the intake system apart recently. At 2500 RPM the turbo's start making a little boost. If you have an air leak post turbo's, it will run rich and can blow out the spark as a result.

Hey mate,

Thanks for the reply.

The miss was there before I changed the plugs, was hoping that changing the plugs would solve the issue.

The car is completely standard. The plugs I used are NGK Platinum PFR6A-11.

Cheers.

GTRNUR Grand Master

GTRNUR

Posted
Posted

Ah, I didn't realise the miss was there before the plug swap.

In that case... you can try close up your plug gaps a little and see if that makes the miss go away.

Also, the checking for air leaks still applies.

Even split vacuum hoses, like the one from the back of the vacuum manifold that goes to the MFD map sensor can cause a sufficent enough leak to cause a miss.

If those checks fail, then I would also be inclined to think coil packs. Buying a set of splitfires to diagnose straight off the bat is a bit excessive IMO.

iwanta34gtr Grand Master

iwanta34gtr

Posted
  • Author
Posted

Check you haven't left a hose clamp un-done if you also had part of the intake system apart recently. At 2500 RPM the turbo's start making a little boost. If you have an air leak post turbo's, it will run rich and can blow out the spark as a result.

Thats a good point, I was also thinking it may have a leak a few days ago?

Its just before it comes on boost it misses approx 2500 RPM and then boost will just kick in hard.

And also when just on a staight road cruising for example in 5th, low RPM - it will miss around 2,500RPM.

Havent been able to see any obvious leaks though.

Also put a new K&N high flow panel filter in this morning, no difference (still missing - before and after).

iwanta34gtr Grand Master

iwanta34gtr

Posted
  • Author
Posted

Even split vacuum hoses, like the one from the back of the vacuum manifold that goes to the MFD map sensor can cause a sufficent enough leak to cause a miss.

If those checks fail, then I would also be inclined to think coil packs. Buying a set of splitfires to diagnose straight off the bat is a bit excessive IMO.

Cheers mate, will take a look in this area tomorrow.

Owgasm Grand Master

Owgasm

Posted
Posted

Yeah, well replacing the plugs is the cheapest option and you hope that it fixes the problems.

Next i'd try coilpacks, as they are at least 10 years old now.

Just like the R32/R33s, they need to be replaced eventually.

edit: slow to submit post.

Perhaps try to borrow a set from someone in Sydney?

iwanta34gtr Grand Master

iwanta34gtr

Posted
  • Author
Posted

Yeah, well replacing the plugs is the cheapest option and you hope that it fixes the problems.

Next i'd try coilpacks, as they are at least 10 years old now.

Just like the R32/R33s, they need to be replaced eventually.

edit: slow to submit post.

Perhaps try to borrow a set from someone in Sydney?

Hi again mate,

Cheers for the reply.

Yeah I've had coil packs fail for me in my S15's and R34's previously too. (Example - one day my S15 started sounding like a rexy)

Had a close friend help me change the plugs today and check out the packs, he used to be a mechanic by trade - he also said they looked like they weregetting on with age and would most likely need to be replaced.

I also did change the fuel filter the other day, made a difference for when it comes on boost, but obviously didnt fix the miss under low RPM.

iwanta34gtr Grand Master

iwanta34gtr

Posted
  • Author
Posted

Also, jjust remembered when i picked up the car the timing was completely retarted.

My mechanic rectified this, and also fixed the idle as it was a bit high.

Dont know if this could be a contributing factor and would need some further attention?

Just thought it may be worth mentioning.

Ironing out the bugs. Love it.

Owgasm Grand Master

Owgasm

Posted
Posted

The way I see it, not sure if correct:

When coilpacks get old, they tend to crack/split and with that the current isn't concealed and you get an uneven current to the spark and therefore missing.

Normally the cracks are hairline and you can't really see them, but sometimes you do.

Best bet and to save you money. Borrow another set if someone is kind enough down that way.

See if its 100% the coilpacks. If it is, replace them, or if you can be bothered, work out which one it is and replace.

GTR-N1 Grand Master

GTR-N1

Posted
Posted

Yes, the pit holes or scorch marks may not show up very well > smear some silicone filler around the packs and cover with electrical tape to ascertain if there's an improvement albeit temporarily.

iwanta34gtr Grand Master

iwanta34gtr

Posted
  • Author
Posted

Genuine Nissan ones are the best.

But they're either really expensive or you can't get them anymore.

The rest are debatable.

Thanks for the tip, much appreciated.

yellow jackets :thumbsup:

theres a big thread about splitfire vs yellow jackets vs oem

Thanks for letting me know, will have a search and read now.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GoHashiriya
      From Japan and back to Europe, my sh*tbox R34 GTT

      By GoHashiriya · Posted

      I got back to Japan in January and was keen to get back on track as quickly as possible. Europe is god-awful for track accessibility (by comparison), so I picked up a first-gen GT86 in December just to have something I could jump into right away. The Skyline came over in a container this time and landed in early January. It was a bit battered after Europe, though—I refused to do anything beyond essential upkeep while it was over there. The clutch master cylinder gave out, and so did the power steering. I didn’t even bother changing the oil; it was the same stuff that went in just before I left Japan the first time. Naughty. Power steering parts would’ve cost double with shipping and taxes, so knowing I’d be heading back to Japan, I just postponed it and powered through the arm workout. It took a solid three months to get the car back on the road. Registration was a nightmare this time around. There were a bunch of BS fees to navigate, and sourcing parts was a headache. I needed stock seats for shaken, mistakenly blew 34k JPY on some ENR34 seats—which, of course, didn’t fit—then ended up having the car’s technical sheet amended to register it as a two-seater with the Brides. Then there’s the GT86. Amazing car. Does everything I want it to do. Parts are cheap, easy to find, and I don’t care what anyone says—it’s super rewarding to drive. I’ve done a few basic mods: diff ratio, coilovers, discs, pads, seat, etc. It already had a new exhaust manifold and the 180kph limiter removed, so I assume it’s running some kind of map. I’ve just been thrashing it at the track non-stop—mostly Fuji Speedway now, since I need something with higher speed after all that autobahn time. The wheels on the R34 always pissed me off—too big, and it was a nightmare getting tires to fit properly under the arches. So I threw in the towel and bought something that fits better. Looks way cleaner too (at least to me)—less hotboy, less attention-seeking. Still an R34, though. Now for future plans. There are a few things still outstanding with the car. First up, the rear subframe needs an overhaul—that’s priority one. Next, I need to figure out an engine rebuild plan. No timeline yet, but I want to keep it economical—not cutting corners, just not throwing tens of thousands at a mechanic I can barely communicate with. And finally, paint. Plus a bit of tidying up here and there.  
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Nope, needed to clearance under the bar a little with a heat gun, a 1/2" extension as the "clearancer", and big hammer, I was aware of this from the onset, they fit a 2.0 with this intake no problems, but, the 2.5 is around 15mm taller than a 2.0, so "clearancing" was required  It "just" touched when test fitting, now, I have about 10mm of clearance  You cannot see where it was done, and so far, there's no contact when giving it the beans Happy days
    • GoHashiriya
      From Japan and back to Europe, my sh*tbox R34 GTT

      By GoHashiriya · Posted

      It's been a while since I've updated this thread. The last year (and some) has been very hectic. In the second-half of 2024 I took the R34 on a trip through Germany, Italy, France and Switzerland - it was f*cking great. I got a little annoyed with the attention the car was getting around Europe and really didn't drive it that much. I could barely work on the car since I was living in an inner-city apartment (with underground parking). During the trip, the car lost power steering in France - split hose - and I ended up driving around 4,000kms with no power steering.  There were a few Nurburgring trips here and there, but in total the R34 amassed just shy of 7,000kms on European roads. Long story short, I broke up with the reason I was transferred to Europe for and requested to be moved back to Japan. The E90, loved it. It was a sunk cost of around EUR 10,000 and I sold it to a friend for EUR 1,500 just to get rid of it quickly. Trust me, moving countries f*cking sucks and I could not be bothered to be as methodical as I was the first time around.
    • MBS206
      NC MX5

      By MBS206 · Posted

      I assume clearances were all a-okay?
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Shock tower brace is in +5Kw....LOL  
×
×
  • Create New...