car wont idle when cold.

[buddielee5]

My friends had a NA 4g63 swaped into a mirage and it does'nt idle very well when cold. any ideas guys? thanks. -Chad

 

[Wells]

Check the IAC.

 

[91Bomb]

Chk ISC motor and plugs.

If he's talking about a rough idle upon starting a previosly fully warmed engine after it's been sitting for 10-30 mins (like when you go to a store and come back out) definately put some intake valve cleaner into the gas tank to help that situation.

 

[Whiplash]

Also try adjusting idle screw. But its probably ISC as stated above.

 

[buddielee5]

I know the iac is idle air control. But What is the isc?

 

[1stGenRocks]

same thing different name. isc = idle speed control motor.

does it idle low and lumpy or does it idle too fast? is the FIAV hooked up? (the 2 coolant lines on the bottom of the throttle body.

 

[SRTthis]

does any one know what the idle speed should be?

 

[doggo]

does any one know what the idle speed should be?

750.

 

[JayRolla]

what is wrong with the idle, does it surge or stumble????

 

[91Bomb]

does any one know what the idle speed should be?

On a cold start during the winter mine is at about 1500 rpm and a warmed up engine should be 750 rpm +/- 100.

 

[1stGenRocks]

On a cold start during the winter mine is at about 1500 rpm and a warmed up engine should be 750 rpm +/- 100.

and if possible you should really check it with a logger. i've seen stock tachs be off by 200rpm which will screw you up trying to set the idle

 

[SRTthis]

well mine is idleing around 1300-1800 so i guess i need to start going over the IAC and all that jazz.. also what should the TPS sensor voltage be???

 

[talontuner1997]

you cant just turn the screw the computer wont allow it. you can turn it all you want and its not going to change the rpm idle. Thats the way it works with the 2g anyway.