Well i think its a misfire?

 

Start car when cold, everything sounds perfect. once the revs settle down out of the passenger side exhaust pipe you hear like a sputtering type of noise, almost like "per per....pper....per....pp...per", yet she runs fine as day when more revs are applied?

 

I havent changed the coil packs around yet to see if that's anything to do with it, and she has a nice and new S2 PTU with cleaned connections so i cant see that being a problem. I'm kinda worried that she might fail on emissions on the passenger side bank at this rate.

 

But when its doing it i get a noticeable change on number 6, if removed, but not on number 4, and i cant try number 2 yet as i havent managed to free the cable enough to unplug it yet *mainly due to not trying lol*

 

So any ideas what it could be if the coil pack and spark plug change doesn't cure it?

intrested on what you find mate as im getting somthing similar on the other bank. lol. i know its not plugs or coil packs. i have series1 ptu so might try that. but like you say its only very slight and only at idle. pick revs up and all is ok:)

 

Well i get no hesitation when i floor it, though im too busy holding on for dear life to even notice much else. so what ever it is, it isn't effecting performance.

as it goes ive got this passed emissions fine got series 1 ptu two new coil packs all new plugs,new maf,decatted,no power loss runs great,na

as it goes ive got this passed emissions fine got series 1 ptu two new coil packs all new plugs,new maf,decatted,no power loss runs great,na

 

You got your through a Emissions test with the same sort of misfire? also do you have decat pipes as mine does, so emissions are going to be a bit higher on mine already.

Edited February 17, 201115 yr by vodkashots

flew through emissions got paperwork from vosa which i gave tester as 300zx not on database can only test it on idle,i can dig it out ,straight through system no cats two hks back boxes

flew through emissions got paperwork from vosa which i gave tester as 300zx not on database can only test it on idle,i can dig it out ,straight through system no cats two hks back boxes

 

Yeah but what i mean is did it have a strange kind of misfire at idle and only at idle from one bank, when you took it? lol

Its always had it at idle,like a intermitant popping or per,perp as you describe it ,only does it on one bank,passed emissions with it,aint got a clue why it does it seems more so when cold but does it after run to.