idle issue rb20det

**noiseMaker_** · 12-10-14, 20:57

Hi all,

Before I changed plugs, she would idle perfect at 800rpm, very steady without any splutter. Since Ive changed plugs she would tick over sometimes at 800rpm, then 600rpm then 400rpm and back up, just all over the place and shes very lumpy...but it would boost and run not a bother, much smoother than before. I was recommended to get NGK copper core for my skyline rb20. Could it be wrong plugs that I got? As well cleaned throttle body with carb cleaner as it was filthy. Gave it good run after but still the same... Any ideas?

**CillianS14a** · 13-10-14, 11:54

sounds like plugs considering it was fine better, one could be faulty. are they the right heat range?

**pt_y2k** · 13-10-14, 12:19

Sure ya didnt pull off a vacuum line or the likes??

**Dunnedriftin** · 13-10-14, 17:53

What are the plugs gapped to ?

**noiseMaker_** · 13-10-14, 18:27

plugs are ngk bcr8es copper core, as far as i know they gaped to .8, i didnt disconnect many vacuum lines just two, and i lifted the whole thing up ( had mate holding it while i was changing plugs lol ). The little pipe under throttle body was all cracked, so I fitted the spare one, but i think its way too small for air to travel through. This is a lil hose I am on about

My yoke is running ~240 at 1 bar, did i get the wrong plugs?

**Hachi** · 13-10-14, 19:25

What plugs were you running in it before, just out of curiousity?

**Ja S14.5** · 13-10-14, 19:35

Throw back in the old plugs again jus so you can rule that out, bcr8's should be sound, jus make sure your vacuum lines are all on properly!

**noiseMaker_** · 13-10-14, 19:40

Originally Posted by Hachi

What plugs were you running in it before, just out of curiousity?

Only have this yoke a month, previous owner had denso pk20pr-p11 plugs in

**noiseMaker_** · 13-10-14, 19:51

Originally Posted by Ja S14.5

Throw back in the old plugs again jus so you can rule that out, bcr8's should be sound, jus make sure your vacuum lines are all on properly!

Yeah thats what i was thinking to do. I won't be able to do it till saturday tho, I wont cause any damage driving it up and back from college?

**Ja S14.5** · 14-10-14, 22:08

Originally Posted by noiseMaker_

Yeah thats what i was thinking to do. I won't be able to do it till saturday tho, I wont cause any damage driving it up and back from college?

Ah ya should be sound, can't see it being anything too serious, it has to be something that you done when changing the plugs if it was sound before you went at it! Check your vacuum pipes whilst your at it,
Let us know how you get on

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