Jump to content
SAU Community

Recommended Posts

car started to miss, mainly above 5000 rpm in first and second. So I put in some new spark plugs same as last ones NPK coppers 0.8mm from memory. It has split fire coil packs which are less than a year old....Still missing quite badly especially above 5000rpm in first....

from trawling heaps of threads on here I've read, people talking about "crank angle sensors " ....and it beening the cause of their car missing..............does my problem sound like it could have anything to do with the crank angle sensor......

a little bit of extra info on mods done ::

dejetro pfc---so no afm's

can't think of anything else that could be related, any help or words of wisdom would be appreciated

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/
Share on other sites

car started to miss, mainly above 5000 rpm in first and second. So I put in some new spark plugs same as last ones NPK coppers 0.8mm from memory. It has split fire coil packs which are less than a year old....Still missing quite badly especially above 5000rpm in first....

from trawling heaps of threads on here I've read, people talking about "crank angle sensors " ....and it beening the cause of their car missing..............does my problem sound like it could have anything to do with the crank angle sensor......

a little bit of extra info on mods done ::

dejetro pfc---so no afm's

can't think of anything else that could be related, any help or words of wisdom would be appreciated

I know this sounds simplistic, but check for boost leaks.

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5068097
Share on other sites

yeah Sheriff they are NGK .8mm same as before, typo in first post... 18psi

yes rb26's have external ignitor, and have quizzed the guys at my local workshop who say if it was that it would more than likely miss right through the rev range and under load , eg 3rd & 4th on the gas ..it doesn't only 1st & 2nd above 5000rpm when reving up fast.. they think probibly crank angle sensor............I have it booked in tomorrow so hopefully they will get to the bottom of this and I will post up the result

cheers guys

stand by

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5077483
Share on other sites

this is getting really annoying, its been missing as above for nearly two months except this morning when I went to the workshop it didn't miss a beat, they checked the odvious stuff again eg spark plug , coils etc took for a hard drive and it never missed once so they though what else can we check this is fine,,

then I pick car up and 30 minutes later its missing again, as above ????

I'm not convinced its a spark problem anymore, ( I'm starting to question everything ), now I'm worried it could be fuel which could be dangerous ......

what to look for, any easy thing to check.............fuel pump maybe

what do I do, short of just start replacing stufff like injectors, fuel pump , regulator etc and there is still the crank angle sensor??

nothing worse than an intermitent problem

got an event in a couple of weeks, need to get this sorted...............................

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5079898
Share on other sites

if it was a fuel problem you could tell by the colour of the spark plugs. also it wouldn't really be a missfire (unless it was an injector not firing properly). if it was the fuel pump then it should get worse under high load in the higher gears as that is when the fuel pump will be working the hardest.

does the problem happen when the car is cold, or only after it has been driving around for a while? if only when hot i would start by getting a new ignitor (although since you have already replaced coils and plugs it wouldn't hurt to get a new ignitor as well).

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5080572
Share on other sites

thanks mad

took the mechanic for a spin this morning and it missed ( hooray ) he said definately a miss not fuel..

So back in on monday to go through ignition system ( especially ignitor & crank angle sensor ) he's already checked gaps, plugs, coils..........

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5080827
Share on other sites

ok well this isn't going help anyone...........

got car back from shop today , all they did was put new plugs in gapped to 0.065mm took for drive , car didn't miss so problem fixed...

the other plugs where new gapped to .08mm ( couple were closer to .085mm ) as before..heat range 6..

Questions ,,, does anyone else with RB26 running 18psi have to run such a small gap, thoughts on plug gaps,,,,,,,,,,,?????

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5089419
Share on other sites

  • 2 weeks later...

18 psi is a reasonable amount of air being forced into a small space, having a larger gap, or even a normal one can end up with the boost air blowing the spark out. lower the gap means you have a more intense spark, less likely to be blown out. iridium and platinum plugs are also sensitive to higher boost levels which is why most revert back to copper.

Link to comment
https://www.sau.com.au/forums/topic/306607-r33-gtr-missing/#findComment-5111360
Share on other sites

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


  • Similar Content

  • Latest Posts

    • Sounds like you've got an interesting adventure ahead here with local support if you have trouble! My guess is that, unboosted, you will be OK with a small upgrade like -9. What will happen is that once the stock ECU sees more airflow than it expects it will add a heap of fuel and pull a heap of timing to be safe because it can't understand how it could get that much air without there being an issue. You will see clouds of black smoke and it won't pull hard through the midrange and top end. So, overall it will be a bit frustrating but should be OK. If you are still nervous set the base timing back 2o through the CAS, but it will be even more sluggish everywhere. As said above through...this is not my guarantee your engine won't be blown into a million pieces, leaving you looking for very hard to find parts A better idea is get a computer with logging ASAP, wire in a wide band O2 sensor and a use remote tuner. I've done multiple cars this way and while it is not as good as a specific tune on a dyno they can get it 90% right. I'd suggest if you can afford an R33 GTR these days you can afford an ECU and tune. And if you can't afford that you sure won't be able to afford the rebuild if it goes bad in the meantime,.  
    • Yeah it would be nice if someone took the time to put that sort of information together, but there are a lot of variations in looms. I think you are making this way hard for yourself if you just want to get it running....sourcing an SR20 with the right wiring will be a billion times easier than matching the RB loom to an S15 chassis. If you do end up going this way, you just need to trace every wire in the loom with a multimeter, 95% of them will go to a location you can confirm at the ECU.....and then post it up for the next person who needs it  
    • Just top it up with water, and keep a general idea of how much you added. It is normal for water to be pushed into and pulled out of the reservoir through the cap, and it should not be more than half full or it will be likely to overflow when hot. Any decent mechanic can do a pressure test of the cooling system to confirm if you have a leak. Keep in mind if it is only leaking a little and when hot it may well evaporate before you see it hit the ground
    • I'd ask the shop what they used and use that. Mixing coolants is sometimes OK, sometimes not, and you have know the details of each coolant to know whether it's a good idea or not.
    • Is it alright to top up with just another green coolant?
×
×
  • Create New...