Low Idle speed - ZR-1 Net Registry Forums

Hoekie · 06-01-2012

I have this problem that the motor idles at a very low speed on startup when cold.
If I dont keep the revs up slightly with the throttle it dies.
As the motor warms up it get better and when hot it will idle properly, any ideas what I can do to solve this?

sammy · 06-01-2012

you might clean you idle air control valve . it on the throttle body on the passenger side . please be careful and ,do not put any pressure on the end of it as yiou will break the spring .

Hoekie · 06-02-2012

Thanks Sammy, that is exactly where I looked this morning and you are 100% correct.

When I stripped it this morning what I found is that the shaft with the little valve had come out of the electronics and the spring had lodged the taper tight into the hole in the plenum.
I managed to screw the little shaft back in, but I obviously dont know where it is supposed to be exactly, but I put the IAC back and the car atleast now idle's, even from cold and it is also not as rich as it was.
Amazing when you solve the poblem that everything suddenly fits.
As they say "hind sight is always the perfect science"
I will obviuosly purchase a new one but any recommendation on make? my problem is Im in South Africa so it will have to be Rockauto or someone like that.

sammy · 06-02-2012

rock auto would be as good as anything .do you have a factory service manual , you know the one the size of a bible .?if not i would invest in one .they are worth their weight in gold . glad you found the problem . have a great weekend

Hoekie · 06-02-2012

Thanks

Yes I do have one got it with the car.
Have you maybe tried to dismantle one of them?
Also changed the fuel filter today and found the old one was installed the wrong way round!!! Dont know if it really matters but it does show direction of flow.
Im still new in playing with a ZR1 but we are getting there. Only have the car for a few months now

sammy · 06-03-2012

no i havent . get a new iac from rock auto .there will be a little adjustment you might have to make to it before you install it then there is a little procedure in the fsm . the first time you start the car with the new iac installed .. good catch on the fuel filter . i change them every 10k miles on both my zr1s .

06-01-2012	#1
Hoekie Join Date: Feb 2012 Location: South Africa Posts: 30	Low Idle speed I have this problem that the motor idles at a very low speed on startup when cold. If I dont keep the revs up slightly with the throttle it dies. As the motor warms up it get better and when hot it will idle properly, any ideas what I can do to solve this?

06-01-2012	#2
sammy Join Date: Jun 2010 Location: back in lone pine Posts: 591	Re: Low Idle speed you might clean you idle air control valve . it on the throttle body on the passenger side . please be careful and ,do not put any pressure on the end of it as yiou will break the spring .

06-02-2012	#3
Hoekie Join Date: Feb 2012 Location: South Africa Posts: 30	Re: Low Idle speed Thanks Sammy, that is exactly where I looked this morning and you are 100% correct. When I stripped it this morning what I found is that the shaft with the little valve had come out of the electronics and the spring had lodged the taper tight into the hole in the plenum. I managed to screw the little shaft back in, but I obviously dont know where it is supposed to be exactly, but I put the IAC back and the car atleast now idle's, even from cold and it is also not as rich as it was. Amazing when you solve the poblem that everything suddenly fits. As they say "hind sight is always the perfect science" I will obviuosly purchase a new one but any recommendation on make? my problem is Im in South Africa so it will have to be Rockauto or someone like that.

06-02-2012	#4
sammy Join Date: Jun 2010 Location: back in lone pine Posts: 591	Re: Low Idle speed rock auto would be as good as anything .do you have a factory service manual , you know the one the size of a bible .?if not i would invest in one .they are worth their weight in gold . glad you found the problem . have a great weekend

06-02-2012	#5
Hoekie Join Date: Feb 2012 Location: South Africa Posts: 30	Re: Low Idle speed Thanks Yes I do have one got it with the car. Have you maybe tried to dismantle one of them? Also changed the fuel filter today and found the old one was installed the wrong way round!!! Dont know if it really matters but it does show direction of flow. Im still new in playing with a ZR1 but we are getting there. Only have the car for a few months now

06-03-2012	#6
sammy Join Date: Jun 2010 Location: back in lone pine Posts: 591	Re: Low Idle speed no i havent . get a new iac from rock auto .there will be a little adjustment you might have to make to it before you install it then there is a little procedure in the fsm . the first time you start the car with the new iac installed .. good catch on the fuel filter . i change them every 10k miles on both my zr1s .