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WHITEPRINCESS : just my opinion, probably ur mechanic knows the problem, but said O2 was faulty so he charged u more, and fixed the lil problem caused ur rough idle.

Rough idle could be lots of things,

Dirty Air Filter, AFM Conection?, or Spark Plug etc,

Clean them and see what happen?

To reset eCU...Instructions:

- FUSE box driver side kick panel, (remove it)

- look under, u should see a grey plug,

- there should be 2 wires on its own,

- short circuit it for 2 second,

ecu should be reset, check for engine light flash.

Hope it helps,

cheers,

darrien

also want to check your aac valve mine was idleing a bit rough doin thatup and down thing sometimes when i stopped at intersections

i ended up pulling the connecter off the aac valve and idles smooth as

i have also replaced my o2 senser and spark plugs, only because my car was running rich as, but wasnt really the cause of makin my idle go all stupid

just my opinion, probably ur mechanic knows the problem, but said O2 was faulty so he charged u more, and fixed the lil problem caused ur rough idle.

the guy was quite honest about what he was doing. i saw what readings he was getting on his diagnostic computer before, it was showing the O2 sensor readings 0.01~0.03 and that's not right - i also have r33 engine manual that confirms that O2 sensor should be giving out something like this 0.3~1.0 from what i can remember. also one other sensor was always saying 'rich' where it should be changing to 'lean' when the car was reved... i know for a fact that when i came in my car was stalling here and there, i saw the guy installing the O2 sensor (no hidden magic there) and when i drove out of the garage 20 mins later, the car was running perfect...

thanks for your feedback though :)

i guess my recommendation would be to find a person who can connect up a diagnostic computer to YOUR car, read the reading and understand them so then they will tell you what's wrong with the car... becuase rough idle can be caused by many things as many people said, in my case it was O2 sensor but on another skyline it could be dirty something or rather etc etc.

  • 4 years later...
Thanks for the info guys. I've been searching around and seems to be the AFM. One other thing i should say is if i open the oil cap while the car is idling, the idle drops quite a bit and the car sounds like its going to stall? Vacuum problem maybe?

I noticed this the other day on mine. Is this Normal?

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