R34 Cold Idle Low

[jessiek]

Hey,

I have recently got a r34 running great expect for a couple days ago, basically the idle when cold is at about 1100rpm and sounds very rough it use to sit around 1500rpm.

When i turn it on when its cold it will slowly creeps to 1100(used to hit 1500 pretty fast) and feel abit rough till warms up to temp any ideas on what it might be or what i would need to do to diagnosis it?

i have a feeling maybe it has something to do with the fuel? cause the first time it did this it chocked when i went to start it, then turned on if that has anything to do with it :s

any help would be great thanks

[niZmO_Man]

Replace fuel filter.

Check the temp sensor plug

http://www.skylinesaustralia.com/forums/topic/87460-hi-i-need-help-on-where-the-water-temp-sensor-rb25/page__view__findpost__p__1578970

#1 in the pic

[jessiek]

The fuel filter was changed around around 6 months ago and for the temp sensor plug is that just under the engine cover?

thanks!

[jessiek]

So i changed the sensor on the weekend and its still doing the same thing and i seem to be getting very bad fuel consumption 350kms max! a tank!

[dori34]

your IAC might be full of carbon build up and causing the rough idle, take it apart and give it a good clean and scrub to remove all the black carbon build up inside.

theres a thread in the DIY section on how to remove, clean and reset the idle.

[Sinista32]

Once you have done that and if it has not fixed the issue, give your Idle screw 1/4 to half a turn - only.

I would not expect you to have idle greater than 1 to 1.2 RPM on your tacho. 1500rpm is like an auto choke

[jessiek]

Solved Thanks! was Either the Water temp sensor or the fuel filter thinking it was the sensor tho i forgot to reset the ECU did it this morning and it fired up nicely!

[The_Modern_Greaser]

Could have been the fuel filter, my RB30 injectors are leaking and its idling on about 900-1k rpm, usually sits on about 1.1k - 1.2k. So if the fuel supply's being cut, it'll obviously do that. Good its fixed though, I've still gotta get round to my injectors ha