Jump to content
SAU Community

Fouling Plugs On My Rb30

FAT_3L

By FAT_3L,
in Engines & Forced Induction

 Share

Recommended Posts

FAT_3L Collaborator

FAT_3L

Posted
Posted

hi guys got a drama ive been having for a few weeks and need some advice so here goes...

I have a rb30et fairly worked, i had the engine in another car until my brother crashed it for me.

Now i had a mate install all my running gear into another vl and mounted my coils in a different spot, this is the only difference from my other car.

I had the car defect almost instantly when it got onto the road so it sat in my shed for around 6 months, modifying it for my engineers cert. It was started regularly still.

I have finally got the car legally road registered and now i keep blowing the plugs!! :)

I thought it was just way out of tune so i took it to my tuner. He dynoed it for me and he said it read as everything was fine. That day i drove it home and replaced my plugs. 4 days later they fouled up again, not all 6 this time just the back 3 (4,5,6). First 3 were fine so i replaced them again thinking they may have been faulty.

1 day since replacing them i have blown them again!!

Compression reads around 125psi over all 6 cylinders. My tuner said that is about right due to my setup and cam.

My tuner is well known for tuning microtech's aswell!!

I just dont understand what it could be!!

Any help will be appreciated

Thanks in advance...

Kris

Link to comment
https://www.sau.com.au/forums/topic/169750-fouling-plugs-on-my-rb30/
Share on other sites
T04GTR Grand Master

T04GTR

Posted
Posted

ok. well theres some reason for it. what sort of microtech is it? and was the wiring redone? it sounds like the ecu or the wiring for the injectors.

we fitted a brand knew haltech a while ago and had to send it back cos it was fouling no3 plug. new one. al fixed

FAT_3L Collaborator

FAT_3L

Posted
  • Author
Posted (edited)

blind elk - the car will run rich when it is cold but pretty well when it up to temp!!

tridentt - Nah crash was at the side toward the back witha guardrail. :thumbsup:

T04GTR - Microtech is a ltx12. it was a brand new loom when it was installed on the old car and i guess nothing has changed since unless something when wrong when getting installed. But wouldn't something ke that show up on the dyno??

NXTIME - Formally Rx Engineering turned to Blacktrack Performance

Guilt-toy - Its a custom plenum and not sure what reg but is new from autobahn. only one i could get at the time! and yeah the fuel pressure is reading good!

http://img263.imageshack.us/my.php?image=k...ncars021tx1.jpg

Heres the pic the some specs on the car,

NOTE: coils were mounted there but since have been moved onto the chaiss rail underneath the plenum after i encounted the problem because it was earthing on the firewall every now and than but not on the back 3 cylinders coils.

R31 Nismoid -

Engine management is a microtech ltx12. 6 individual bosch coils,. the head has been rebuilt with a stage 3 cam, good port and polish, new valve springs, lifters etc. The bottom end has standard rods, arias forged pistons (20 thou), not sure about rings thou (which is what im thinking but hopefully not), Turbo is a t04 highmounted, custom plenum and fuel reg, 550cc injecters (RX7), 450hp external pump.

Thats all i can think of at the moment, if u require any more infom just ask. thanks for ur help so far!!

Also the car has made 380hp on 14psi but on the last tune it made 340hp on 15psi ( i think the dyno was out but i have given you the info incase the problem may cause the loss in power)

Edited by FAT_3L
FAT_3L Collaborator

FAT_3L

Posted
  • Author
Posted (edited)

blind - they are standard plugs for a vlt gapped to .8mm. i have tried hotter plugs but they do the same just not as quick!!

rob82 - everytime i start the car after driving it for a while or at all at that, i need to give it a good rev so it will idle properly, otherwise it will stall or go very close but once i do that the car will run fine up until the plugs start to break down or i turn it off!!

Edited by FAT_3L
Adriano Grand Master

Adriano

Posted
Posted (edited)

I would get the injectors looked at, at the best of times, rx7 injectors have a poor spray pattern not really suited to iston motors, yours may just be dirty. When you say they are fouled, do they come out smelling fueley or are they just black?oily?

Edited by Adriano
FAT_3L Collaborator

FAT_3L

Posted
  • Author
Posted

T04GTR - It just had a tune. if i turn the ignition on it may tell me the afr on the hand controller but im not to sure what the afr will be idleing at the moment as i am relocating the coils and havn't wired it up yet.

Adriano - it's only the back 3 plugs that are fouling up. the front 3 come out perfect while the back the are very fuely, dont think its oily

Al Grand Master

Al

Posted
Posted
rob82 - everytime i start the car after driving it for a while or at all at that, i need to give it a good rev so it will idle properly, otherwise it will stall or go very close but once i do that the car will run fine up until the plugs start to break down or i turn it off!!

Sounds like it could be a number of problems :stupid:

- wiring

- tune

- posible leaking injectors

- ecu

- etc.

Take it to a another mechanic who can diagnose the fault and sort out the issues. On the net you will just get a whole heap of "maybe's" but no real solution.

Not being rude/smart/etc., but why post up on SAU, when there are SOOOOOOOO many VL / Commodore forums that have better experience/knowledge on the RB30et. Even the R31 forum would likely know more and be of greater assistance. :laugh:

FAT_3L Collaborator

FAT_3L

Posted
  • Author
Posted

because here i have actually recieved some help off people that offer there experience and knowledge. i never even know of the r31 forum but will try there.

as for a machanic most of them here talk crap just to get your money and don't fix the actual problem, and i can't drive it at the moment anyway because i havn't finished wiring my coils!!

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

    • The king 2.0
      Nissan fuga 450gt android screen

      By The king 2.0 · Posted

      Hi guys . Can someone help me  I bought an Android screen for my Nissan fuga but it won't turn on   
    • MBS206
      NC MX5

      By MBS206 · Posted

      My guesstimate, with no real numbers to back it up, is it won't effect it greatly at all.its not a huge change in position, and I can't see the air flow changing from in turbulence that much based on distance, and what's in front of it. Johnny and Brad may have some more numbers to share from experience though.
    • dbm7
      Automatic Power Button Light Flashing

      By dbm7 · Posted

      Which solenoid? Why was it changed? Again, why was this done? ...well, these wear..but ultimately, why was it changed? Did you reset the idle voltage level after fitment? I'm just a tad confused ~ the flash code doesn't allude to these items being faulty, so in my mind the only reason to change these things, would be some drive-ability issue....and if that's the case, what was the problem? Those questions aside, check if the dropping resistor is OK ...should be 11~14 ohms (TCU doesn't throw a flash code for this) ~ also, these TCU designs have full time power (to keep fault code RAM alive), and I think that'll throw a logic code (as opposed to the 10 hardware codes), if that power is missing (or the ram has gone bad in the TCU, which you can check..but that's another story here perhaps).
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Question for people who "know stuff" I am looking at doing the new intake like the one in the picture (the pictured is designed for the OEM TB and intake plenum), this design has the filter behind the front bar, but, the filter sits where the OEM duct heads into the front bar, and the standard aperture when the OEM ducting is removed allows the filter to pulled back out of the front bar into the engine bay for servicing, a simple blanking plate is used to seal the aperture behind the filter This will require a 45° silicone hose from the TB, like the alloy pipe that is currently there, to another 45° silicone hose to get a straight run to the aperture in the front bar Question: how will it effect the tune if I move the MAF about 100-150mm forward, the red is around where my MAF is currently, and the green would be where it would end up Like this This is the hole the filter goes through  Ends up like this LOL..Cheers    
    • Duncan
      R34 Plug Identification

      By Duncan · Posted

      Despite the level up question, actually I do know what that is....it is a pressure sender wire.  So check out around the oil filter for an oil pressure sender, or maybe fuel pressure near the filter or on the engine. Possibly but less likely coolant pressure sensor because they tend to be combined temp/pressure senders if you have one. Could also be brake pressure (in a brake line somewhere pre ABS) but maybe I'm the only one that has that on a skyline.
×
×
  • Create New...