Strange Power Issues

[Darkplague]

Hey, about 2 months back shortly after i bought my r34 GT some problems started to occur that i tried to ignore them hoping they wouldnt came back but it seems to be happnening quite a fair bit now. It seems like the problems are very similar.

Problem 1. On startup at rare times the idle will be very irratic for a minuite or so.

Problem 2. The engine warning light will come on for no reason and the car acts fine for awhile, eventualy ill pull up to a set of lights or something and the idle will be extremely irractic, then when i go to take off i have to put my foot almost flat to the floor to take off as quickly as i normaly would, almost like im running on 5 cylinders or something.

Problem 3. Ive noticed on the highway if im going about 95 and i stay at the speed, every now and then all of a sudden the car gets a sudden boost in power and without me putting my foot down to accelerate the car starts accelerating i can easily hit 110 without moving my foot.

Also at times the car feels like it has more/less power then usual.

I just cant figure out whats goin so i thought id just ask in case someone has some clue of whats going on.

Should also mention the car is about to be booked in for a service.

[gt-ahhh!]

i have some of those symptoms. and i've narrowed it down to what i suspect is the O2 sensor. i completely unplugged it and it made no difference (better or worse) so im assuming that means it farked!

have a read of this:

http://www.skylinesaustralia.com/forums/O2...sor-t43095.html

have you noticed poor fuel economy? that would normally be a good sign of the 02 sensor being rooted.

i dare say it would be the original part still in there, god knows japs dont look after their cars. i believe theyre recommended to be replaced every 40000.

theyre only $80-100 so its probably worth replacing anyway, otherwise id advise getting a diagnosis performed on a dyno. theyre quite useful.

good luck!

[Darkplague]

Ah thats interesting, might have to look into that. I should of also mentioned i get a very strong fuel smell in the car if i have my windows down or at low speeds. Im not sure exactly how many km to a full tank, all i know is it lasts me about 2 and a half weeks going to work and back. But thanks ill defently look into that.