The idle keeps surging from 1000 rpm to 2000 rpm until you put it in gear (auto ).
Is there a way to check if the IAC is working or not?
Or could it be something else?
No codes no light.
Any help would be great.

John

 

Unplug the IAC while the car is acting up.
Be sure the car is full of coolant.
You can also try to clean it out with throttle body cleaner.

 

I did unplug the IAC and the idle got rough and pulsated around 1000 rpm's.

What should it do?

John

 

did you chk to see if you have enough coolant ?? you could also have a vacc leak, chk the adjuster screw at throttle body make sure it is not ready to fall out,,

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2BDiesel &raquo;</TD></TR><TR><TD CLASS="quote">I did unplug the IAC and the idle got rough and pulsated around 1000 rpm's.

What should it do?

John</TD></TR></TABLE>You've got excess air entering the intake from somewhere. Check for a dirty IACV, Vaccum leaks in lines and intake and throttle body gaskets, Bad PCV, too tight throttle cable or throttle plate not closing properly, Idle screw out too far, and for air trapped in the coolant lines. On a car that is operating properly, the idle should fall to between 450 and 550 when the IACV is ulplugged.

 

Where is this screw located?
Coolant is full.
Cleaned iacv.
The idle did not fall to 450-550.What does this mean?

I will check for vac leaks.

John

 

also could be a fuel pressure problem...

 

Fast Idle Valve or Throttle position sensor maybe.