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Stuttering/hesitant At High Revs

JamesK

By JamesK,
in Victoria

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JamesK Experienced

JamesK

Posted
Posted

Hey guys i started to notice recently when i drive flat out and at high revs the car stuttered/hesitated a little i thought it was the sparks so i change the shitty ones that were in there to nice new NGK iridiums :/ it didnt fix it per say but the problems changed now it feels like im hitting the rev limiter at 4-4.5K for a moment then goes fine again, but i havent been able to get on the freeway to really give it a go yet. Im thinking it might be the packs but i wanted to get some input before i blow a wad on splitfires, also could it be the fuel pump? Maybe ill change the fuel filter and see how that goes first

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https://www.sau.com.au/forums/topic/318677-stutteringhesitant-at-high-revs/
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ashneel Grand Master

ashneel

Posted
Posted

coilpacks.

easy way to check is take out all coilpacks and give them a good clean. look carefully for hairline crack. usually looks like white powdery cracks. if you see then that means your coilpacks are gone. if you can do a DIY repair on them with some clean silicone sealant.

i did that to my R34 and it handled 240rwkw daily for over a year and still going strong.

JamesK Experienced

JamesK

Posted
  • Author
Posted
coilpacks.

easy way to check is take out all coilpacks and give them a good clean. look carefully for hairline crack. usually looks like white powdery cracks. if you see then that means your coilpacks are gone. if you can do a DIY repair on them with some clean silicone sealant.

i did that to my R34 and it handled 240rwkw daily for over a year and still going strong.

Hmmm that might make sense, I noticed on the 4th sparky that it was the only one covered in a small amount of white powder, I was wondering what it was but I was in a bit of a rush to get them back in so I didn't take much notice. Do you think that's the problem?....splitfires time?

ashneel Grand Master

ashneel

Posted
Posted

well it could be that or anything really. thats just the first and easiest thing to check. and if faulty cheapest to fix. try the DIY method out first or borrow somones coil packs. then if that fixes the problem you can make you mind if you should get splitfires or not.

JamesK Experienced

JamesK

Posted
  • Author
Posted
well it could be that or anything really. thats just the first and easiest thing to check. and if faulty cheapest to fix. try the DIY method out first or borrow somones coil packs. then if that fixes the problem you can make you mind if you should get splitfires or not.

Just did the whole tape DYI fix, not sure, it seems like it reduced the symptom but I'm also thinking it could be placebo effect. I didn't see any cracks or anything on my packs though....

BeEnAr Experienced

BeEnAr

Posted
Posted

take it off and clean it. Get the MAF sensor cleaner from Bursons etc. it works a treat!

When you say you did the Tape DIY fix, wht did you tape? If it was the coils themselves then maybe do the whole loom as well, I did the loom on mine and it fixed all stuttering issues I had, after cleaning the MAF's and doing the solder joints on them too. Oh and make sure your spark plugs are gapped down to .8mm

JamesK Experienced

JamesK

Posted
  • Author
Posted
take it off and clean it. Get the MAF sensor cleaner from Bursons etc. it works a treat!

When you say you did the Tape DIY fix, wht did you tape? If it was the coils themselves then maybe do the whole loom as well, I did the loom on mine and it fixed all stuttering issues I had, after cleaning the MAF's and doing the solder joints on them too. Oh and make sure your spark plugs are gapped down to .8mm

mmm might have to have a look into that, I only taped up the actual packs and not the rubber part if thats what you mean. I was thinking about the gap. I thought it was 1.1 for stock boost?

BeEnAr Experienced

BeEnAr

Posted
Posted

nooo not the packs themselves, you don't need to tape them up. Pull the loom off (the wires with all the plugs) and check it for any splits, (mine had several and could see bare wire on a couple) then tape the whole thing up with some decent electrical tape (nitto FTW) then you should be right, if that's your problem

JamesK Experienced

JamesK

Posted
  • Author
Posted
nooo not the packs themselves, you don't need to tape them up. Pull the loom off (the wires with all the plugs) and check it for any splits, (mine had several and could see bare wire on a couple) then tape the whole thing up with some decent electrical tape (nitto FTW) then you should be right, if that's your problem

I just followed this guide

BeEnAr Experienced

BeEnAr

Posted
Posted

yes, but dit you have any cracks in the epoxy or not? If no then you wasted your time. Try doing the loom as well, you'll probably find it has a split somewhere, otherwise I rekon it's dry solder joints in the MAF Sensor. Fix it by resoldering the joints Tutorial Here

JamesK Experienced

JamesK

Posted
  • Author
Posted
As far as I know James is still running the standard boost solenoid so boost cut is out. I still place my bet on coilpacks.

Kirs is right standard boost :(, gonna order new splitfires I think

BeEnAr Experienced

BeEnAr

Posted
Posted

Have you checked your Loom and done the MAF joint with fresh solder yet? That's a LOT cheaper than new Splitfires. If it's not your coils then when you get your new ones you will have the same problem.

The above 2 fixes will take bugger all time to do and will cost you all of $5 for tape and solder a little more if you need to buy a soldering iron too but still a lot less than the Splitfires will sting you :)

Owgasm Grand Master

Owgasm

Posted
Posted

I had this problem after a quick squirt on the track.

Checked everything, sparks, coils, intercooler piping etc.

Turned out to be the Vac hose on the Fuel Pressure Regulator, felt kinda stupid once I noticed the little hose dangling.

Chances are yours isn't this, but yeah.

Good luck.

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