please help me my nissan 300zx tt 93 series 2 ,will not idle for the first minute of running when warmed up runs spot on although the idle is a touch low i think at about 650 rpm , i have changed the temp sensor maid no difference please help

does it run fine if you keep your foot on the throttle a bit, how many revs does it settle at?? (i presume thats how you get it to warm up)

that might be the thingy bob valve...... the one that opens when the car is cold to allow more air in to increase cold idle. think its the air regulator that regulats air when cold check that maybe? Is the car all good once its warm?

Edited January 9, 200916 yr by j1mmytt

Could be mate, I've just put mine back on about 2 hours ago, after overhauling it, you have the idle control valve (basically a sollenoid), and the air regulator unit that the throttle control valve is attached to, which also has a sollenoid. They do sometimes get gunked up inside, mine was clean (I have a similar problem) but cleaned it all anyways, and the connectors on the sollenoids were really manky, so cleaned them up, put it all back together, and hey preto!!! Still the same.... :-( :-(

 

It's located on the back of the plenum, right hand side, with two plugs on it, a yellow one and a grey IIRC.... 4 10mm bolts, 3 you can see, and as always, 1 you can't :-)

 

It's a bit of a ball ache to take off, small hands are handy, you got any kids? :-)

Also, if you do remove it, and then the sollenoids, be careful not to loose the little springs when you remove em.... Best of luck mate, if ya cure it, let me know!!! HTH...

Also, you can test the sollenoids by putting 12 volts on the two pins, same for both, and you should hear it 'click'......

yes i hold the peddle down a bit for a minute then let go slowly it will idle then at about 650-700 rpm?