Jump to content
SAU Community

Weird Misfiring At 2000rpm? (rb30)

BradyJ_R31

By BradyJ_R31,
in Engines & Forced Induction

 Share

Recommended Posts

BradyJ_R31 Apprentice

BradyJ_R31

Posted
Posted (edited)

Hey pplz.. I guess this is the fun part about owning a car i was sposed to be going for a roadworth cert. last friday but now shes playin up :D okay..saturday last weekend i put all new plugs in my R31, that afternoon it worked perfectly...(quieter..no smoke) then the next morning i started it up, it idled fine, let it warm up then lightly put my foot down and the revs dropped? to about 500Rpm and nearly stalled, then once it got past that stage and revved it to around 2000rpm it started unevenly revving (1500 - 2500)... so any help would be greatly appreciated, changing the plugs is all i have touched under the bonnet since it started playing up..i am trying to avoid a mechanic atm as they'll no doubt charge more than i paid for the car :)Brady.

post-29588-1150186036.jpg

Edited by BradyJ_R31
Link to comment
https://www.sau.com.au/forums/topic/122109-weird-misfiring-at-2000rpm-rb30/
Share on other sites
SKY031 Grand Master

SKY031

Posted
Posted

Did you put the leads back on in the right order?

Have you re-checked that one of the leads hasn't come loose?

Did you buy the right plugs?

How did the old plugs look? (colour/condition)

Did you touch anything to do with the distributor?

You mentioned smoke prior to changing the plugs, what colour was the smoke?

BradyJ_R31 Apprentice

BradyJ_R31

Posted
  • Author
Posted

Um the guy at supercheap auto picked out the plugs for me....they fit perfect and all but would surprise me if they are wrong, nah i checked all the leads and lead numbers, the old plugs had barely any soot on them but were very very old, i was going to try putting the old ones back on but i threw them all bar one : the smoke prior to the new plugs was like wispy blue smoke, evn after it had warmed up, i had a look in some other forums and some ppl said there AFM was gone....wats that lol...thnx brady

Nosmo Enthusiast

Nosmo

Posted
Posted

Everyone seems to jump to the AFM (Air Flow Meter) conclusion, but its rarely the cause.

If your car ran fine before you changed the plugs then there is really no reason to look at things like the AFM.

Start by looking at the plug leads - are they clean and tight fitting. Are they in the correct order?

Look at any inlet piping removed during the replacement - are any hoses loose or missing (some are under the inlet / plenum and can be hard to see).

Look at the electrical connectors - are any loose or disconnected?

Hope this helps! If not, let us know and we'll give you some other pointers!

Cheers,

J

BradyJ_R31 Apprentice

BradyJ_R31

Posted
  • Author
Posted

Ahh ok, because i did have to take all the inlet piping off above the rocker cover, i did not know about too many hoses under the plenum lol, so i might have to check it out, how much (average) would all new spark plug leads cost? could be a wise investment, the old ones could be the cause aswell as they arent the best lookin ones ive seen :D

Nosmo Enthusiast

Nosmo

Posted
Posted

I have a set of standard leads on mine original from factory - still working perfectly.

Mate of mine had a set of after market 8mm leads on his GTS - ran like shit. Ended up putting my standard ones on the GTS...

Also, make sure your oil filler cap is tight and sealing properly. This will make a big difference if not right!

BradyJ_R31 Apprentice

BradyJ_R31

Posted
  • Author
Posted

Geez i never realized how many things it could be lol but yeah this weekend i might just get in there and try it all out, maybe go back to supercheap and check the polug type, could it be anything fallin into a cylinder (dust,gunk) thats doing it? from when i took the plugs out,?..thanx a heap

BradyJ_R31 Apprentice

BradyJ_R31

Posted
  • Author
Posted

Yeah it sstill starts 1st time everytime, and it idles fine (around1000rpm) but if you slightly put your foot down the revs will drop....then pick up again and at round 2000 it just fluctuates the revs, but nah i havent checked the gaps yet, thnx brady

rob82 Mentor

rob82

Posted
Posted
make sure you have the right gap in the spark plugs as well this makes a big difference.

For 33's its 8mm's off head. Dont know about yours but should be similar

8mm thats a big gap!!! I think he means 0.8mm. And for a naturally aspired RB30 it should be about 1.1mm gap. Check that you didn't crack a plug when you installed them would be my advice.

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

    • mr.torquesplit
      T56 In Gtr

      By mr.torquesplit · Posted

      looking forward to your t56 swap man its a game changer if it works! 
    • Kinkstaah
      MLR's Bogan cruise ship

      By Kinkstaah · Posted

      So, when are you trying the new GR86 or BRZ?
    • The Bogan
      MLR's Bogan cruise ship

      By The Bogan · Posted

      Uncle Duncan Yeap, FI Interchiller  Works well, normal IAT's cruising with the WTA only went from 50°c+ to 25-30°c with the interchiller  Before, when on it hard, the IAT would see 80-90°c, now, the highest has been was around 38°c IIRC IAT is measured under the blower hat I recommend it for the street or strip where your only on it hard for 10 or so seconds, but it wouldn't be efficient for sustained track use as it would heat soak from the AC turning off or whatever it does during WOT to protect the compressor It really needs the AC running for it to not heat soak and keep the WTA coolant chilled My WTA coolant temps when just cruising is around 2°c
    • Duncan
      MLR's Bogan cruise ship

      By Duncan · Posted

      Hey Mark...sorry to interrupt your career change to hair dressing... but...did you ever fit the interchiller to the commodore, and if so how was it? And, who made it?
    • The Bogan
      MLR's Bogan cruise ship

      By The Bogan · Posted

      I've been pondering this, I really enjoy the convertible thing, for me, it's like riding a motorbike, without all the issue of riding a motorbike, mainly, my old sore arthritic joints getting beaten up, and, being able to do it in shorts and a T-shirt and not needing a helmet and all the other gear required, especially like wearing jackets and pants in the summer, or needing 6 layers of cloths in the winter, or not having wet weather gear handy when your 100km away from home on the bike when it decides to start raining As for the hard top and its Coupe look, whilst I do lose all that open top feeling that I really enjoy, from my experience with the NB with a detachable hard top, the cabin is a much nicer place to be, the difference in noise for one, a hard top quietens down the interior, alot, with the soft top up or down it's pretty noisy, which, after 5 or so hours, can get tiring But, as you stated, the detachable hard top totally changes the look of the car, in a really good way, and for me, the look of a detachable hard top is so much better than the PRHT which looks more like a after thought with its weird bulbous rear roof line For me, the minimal effort of putting in on, or storing it after removing it, is well worth the time and effort for the look alone And yes, I'm sure the next owner will be grateful for it as well.......  
×
×
  • Create New...