Jump to content
SAU Community

Spark Plugs,can They Affect Idle?

aleisha

By aleisha,
in R Series (R30, R31, R32, R33, R34)

 Share

Recommended Posts

aleisha Apprentice

aleisha

Posted
Posted

hi,i recently bought cheap spark plugs to go into my r33 but a couple hours after i put them in my car it started over revving????????

it usually revs at idle around 850 rpm but it now revs at 1200 rpm at idle.

could it be the cheap spark plugs cause i was told that cheapo ones arent good for turbo cars and i was meant to put either platinum or iridium dont know if thats the right spelling but yeah either of those 2.

any ideas?

Link to comment
https://www.sau.com.au/forums/topic/298413-spark-plugscan-they-affect-idle/
Share on other sites
aleisha Apprentice

aleisha

Posted
  • Author
Posted

also when i was putting them in my friend increased the gap on all the spark plugs,he told me it helps with something like performance or making the spark plugs last longer?

just thought i would add that as well just in case when he made the gaps bigger it may have caused the problem because the idle was at 1400 rpm and i had to turn in the idle screw to get it down to 1200 rpm.

Dorigecko Proficient

Dorigecko

Posted
Posted

plugs are plugs. so longs as they're in the right heat range they're fine. what part number are the plugs? should be a heat range of 5 or 6.

some people will tell you that you HAVE to buy platinums, other people will tell you that they do nothing. doesn't really matter...

the increase in gap would normally make it miss as the standard coil packs don't put out enough juice to spark anything past 1mm. most people do .9mm (standard gap). RB20s have 1.05mm gaps, so if you've got 1.1 it shouldn't be TOO bad.

Shouldn't really touch the idle screw man..

What else has been touched?

aleisha Apprentice

aleisha

Posted
  • Author
Posted
plugs are plugs. so longs as they're in the right heat range they're fine. what part number are the plugs? should be a heat range of 5 or 6.

some people will tell you that you HAVE to buy platinums, other people will tell you that they do nothing. doesn't really matter...

the increase in gap would normally make it miss as the standard coil packs don't put out enough juice to spark anything past 1mm. most people do .9mm (standard gap). RB20s have 1.05mm gaps, so if you've got 1.1 it shouldn't be TOO bad.

Shouldn't really touch the idle screw man..

What else has been touched?

what happens when you touch the idle screw?i had no other choice as the car was revving too loud.

when i started it up it was like someone had there foot on the pedal contantly and there was no way i could drive my car around revving so high.

i will get the part number for the spark plugs in the morning as im taking them out,the only other things that have been touched are the plenum,the throttle body, the rocker covers and the aac valve,the plenum and throttle body had some carbon build up so we cleaned it all off and the same with the aac valve and we only took the rocker covers off because it made it a heap easier the put the plenum back on and we put it all back together carefully to make sure it was done right.as far as i know there isnt an air leak but they are near impossible to track down if there was one.

blind_elk Grand Master

blind_elk

Posted
Posted

Oh dear, you cleaned carbon from the throttle body. This is a common cause for high idle in GT-Rs, so I wouldn't be surprised if the same thing happened in GTSTs.

You may also have dislodged the TPS so it no longer sends the "throttle closed" signal to the ECU.

aleisha Apprentice

aleisha

Posted
  • Author
Posted
Oh dear, you cleaned carbon from the throttle body. This is a common cause for high idle in GT-Rs, so I wouldn't be surprised if the same thing happened in GTSTs.

You may also have dislodged the TPS so it no longer sends the "throttle closed" signal to the ECU.

is there a way to fix this?i didnt know that cleaning carbon could do that to it and what is TPS?sorry not good with abbreviations and can that also be fixed?

blitz r33 Collaborator

blitz r33

Posted
Posted
what happens when you touch the idle screw?i had no other choice as the car was revving too loud.

when i started it up it was like someone had there foot on the pedal contantly and there was no way i could drive my car around revving so high.

i will get the part number for the spark plugs in the morning as im taking them out,the only other things that have been touched are the plenum,the throttle body, the rocker covers and the aac valve,the plenum and throttle body had some carbon build up so we cleaned it all off and the same with the aac valve and we only took the rocker covers off because it made it a heap easier the put the plenum back on and we put it all back together carefully to make sure it was done right.as far as i know there isnt an air leak but they are near impossible to track down if there was one.

we're in the same boat,it aint your spark plugs because mine was fine until i cleaned all the carbon from the throttle body and the top of the plenum as well.

now my car sits at high idle with no explanation of why it does it?

StealthX Veteran

StealthX

Posted
Posted

you need to reset your ECU, or perform and Idle air re-learn.

cos the ECU has 'forgotten' the signal that determines how much air and how much the throttle needs to open, for a solid idle.

Problem is, ive got no idea how to do that on a skyline...

should be just pull out the fuse for the engine computer, then leave it for about 10 minutes, then pop the fuse(s) back in and that should do it.

But then again, ive never done it on a skyline.

Take it to a nissan dealer, they can do it all for cheap as chips, or someone in here will know how to do it...

try this thread for more info: http://www.skylinesaustralia.com/forums/Hi...Rb-t297518.html

and these two DIYs should solve your problem (i hope!)

http://www.skylinesaustralia.com/forums/Di...tml&hl=idle

http://www.skylinesaustralia.com/forums/Ni...tml&hl=idle

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

    • Kinkstaah
      Blue slip

      By Kinkstaah · Posted

      I mean, I got two VASS engineers to refuse to cert my own coilovers stating those very laws. Appendix B makes it pretty clear what it considers 'Variable Suspension' to be. In my lived experience they can't certify something that isn't actually in the list as something that requires certification. In the VASS engineering checklist they have to complete (LS3/NCOP11) and sign on there is nothing there. All the references inside NCOP11 state that if it's variable by the driver that height needs to maintain 100mm while the car is in motion. It states the car is lowered lowering blocks and other types of things are acceptable. Dialling out a shock is about as 'user adjustable' as changing any other suspension component lol. I wanted to have it signed off to dissuade HWP and RWC testers to state the suspension is legal to avoid having this discussion with them. The real problem is that Police and RWC/Pink/Blue slip people will say it needs engineering, and the engineers will state it doesn't need engineering. It is hugely irritating when aforementioned people get all "i know the rules mate feck off" when they don't, and the actual engineers are pleasant as all hell and do know the rules. Cars failing RWC for things that aren't listed in the RWC requirements is another thing here entirely!
    • GTSBoy
      Best place to order Authetic R32 Parts in Japan

      By GTSBoy · Posted

      I don't. I mean, mine's not a GTR, but it is a 32 with a lot of GTR stuff on it. But regardless, I typically buy from local suppliers. Getting stuff from Japan is seldom worth the pain. Buying from RHDJapan usually ends up in the final total of your basket being about double what you thought it would be, after all the bullshit fees and such are added on.
    • GTSBoy
      Ethanol Content Sensor - Always at 11%?

      By GTSBoy · Posted

      The hydrocarbon component of E10 can be shittier, and is in fact, shittier, than that used in normal 91RON fuel. That's because the octane boost provided by the ethanol allows them to use stuff that doesn't make the grade without the help. The 1c/L saving typically available on E10 is going to be massively overridden by the increased consumption caused by the ethanol and the crappier HC (ie the HCs will be less dense, meaning that there will definitely be less energy per unit volume than for more dense HCs). That is one of the reasons why P98 will return better fuel consumption than 91 does, even with the ignition timing completely fixed. There is more energy per unit volume because the HCs used in 98 are higher density than in the lawnmower fuel.
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      No, I'd suggest that that is the checklist for pneumatic/hydraulic adjustable systems. I would say, based on my years of reading and complying with Australian Standards and similar regulations, that the narrow interpretation of Clause 3.2 b would be the preferred/expected/intended one, by the author, and those using the standard. Wishful thinking need not apply.
    • GTSBoy
      Blue slip

      By GTSBoy · Posted

      Yes they do. For some maybe. But for those used the most by abusers, ie Skylines, the numbers are known. The stock eyebrow height for R32/3 Skylines is about 365/375mm or thereabouts. The minimum such heights are recorded in adjacent columns in the database.
×
×
  • Create New...