Rpm Drops

[Puppey]

Hi guys, i'm a newbie here.

i got 32gtr and have a little thing concern.

when i am revving it in the neutral position: the rpm sort of drop a little and then goes up normally. after engine reaches normal operating temperature it still does the same, but just drop less.

what is the likely culprit for this problem? Any input much appreciated

cheers.

[Kujotk]

02 sensors, clean afm, change spark plugs to platnium or iridiums,change oil, depending what rpm you idle at you might have to raise it alittle..... i had same prob in rb25det, eventually it will conk out or nearly conk out.....

i did all of this and the prob went away, but for me i did the 02 sensor last and that completed the solution..... hope this helps, im pretty sure it will

[Puppey]

the O2 sensor??

ok i'll see. but do you know where it is located?

only know it's attached to the exhaust manifold (correct me if i'm wrong ), but don't really know the shape or what it looks like?

[adam-__-]

Quick google search for you,

3

Should be something similar to those.

[Kujotk]

its on the dump pipes that come of the turbo's, you have a gtrso you have 2 dumps with 2 02 sensors

anyway you should change these for better fuel economy, mine was $70 and in a month i have saved about $50 in fuel, i filled up today with $51 where as i'd usually fill up with $70-75 for the same distance...... and the fuel prices have been fairly constant at $1.50-$1.60 for 98 octane fuel.... because there a bitch to take off i just changed the whole dump pipe for a larger one instead of trying to unbolt the old rusty one.

and if you want the idle probs to go away this will help to get rid of it,,,, as i said before, it did the trick in my car, similar engine

[jutstar]

+1 for O2 sesor, worked for me, I had the same problem with bad fuel economy and revs dropping, when I took the old one out, it was all smashed and boken. Fixed my problems.

[joeleo87]

interesting....

i also have this problem, my car idles at about 1300rpm but after reving it the revs drop slightly then go back up. I thought it might have been the AAC vavle???

i just had 1 O2 sensor replaced as my exhaust wheel smashed it to pieces lol, shouldve got my mechanic to replace the other 1.

[Puppey]

thanks for the input guys. will try to look into it.

btw does a 32gtr have more O2 sensor after the cat converter?

funny thing again is now, when i rev, instead of slightly dropping it slightly jumps up... then goes up as normal.

as for the idle, it actually idle very well. very stable.

problem is only when i rev it ...

[Kujotk]

you should be able to hear that the idle isn't constant and if you look really closely i think it will still drop..... mabey you havent noticed it yet

[Puppey]

actually i did accelerate really slowly. so slowly indeed .. and i paid attention at the needle very closely

and it doesn't go down anymore .. not even a slight bit .. instead .. it jumps up .. with the same distance as when it used to drop down (around 50 rpm).

Ok it's the detail .......

(1) previous cold idle: 1,200 rpm.

(2) starting around two weeks ago, rpm drops when i rev (by 100 rpm from 1,200 to 1,100) then goes up as normal.

(3) 6 Oct: i initially just thought it could be clogged injectors . so i just add fuel injector cleaner liquid into fuel tank, the whole bottle into a full fuel tank. that's all i could do as the first step since i was worried

(4) have used up the almost fuel tank until this Sunday.

(5) 12 Oct: rpm didn't drop when i rev (i guarantee not even a bit..), instead it jumps up (by 100 rpm as well).

the difference also ... idle when cold became 1,100 (whereas previously cold idle was 1,200)

(6) so, revving when cold:

before: 1,200 -> 1,100

now : 1,100 -> 1,200

seems like there is a gap there between 1,100 and 1,200 that rpm just skips.

what do you think ?

[Rocky88]

Same problem with R32 gts-t. Same solution?

[Kujotk]

clean throttle body, change sparks, clean afm, check that there are no leaks in the engine pipes and 02 sensors..... has to be these..... its just general maintenance issues....

same solution for gtst

[Puppey]

clean throttle body, change sparks, clean afm, check that there are no leaks in the engine pipes and 02 sensors..... has to be these..... its just general maintenance issues....

same solution for gtst

kujotk ... thanks hips for the answers . i will try to get all those done... thanks again