FORD guys - help...4.6 idle problem

[zam70]

My wife drives a 92 crown vic with the 4.6 modular engine.
The damn thing sporadically wants to idle low, almost to the point of dying.

I've cleaned the throttle body (helped for a few days), put on a new IAC valve, changed the plugs and wires - It still has the problem.
Cleaning the throttle cody seemed to help the most and all was great for about 3 days - then it started idleing low again

Runs excellent under all other circumstances except when sitting at an idle...

Any help would be appreciated

Thanks
Scott

 

[John Larkin]

Maybe you could open up the throttle plate a little to stabilize the idle airflow beyond the IAC.

 

[zam70]

I thought about this...on my Regal, I've got the throttle plate opened up so the IAC doesn't function at all at idle (I run a MaxEffort chip).

Any draw backs to not giving the IAC as much control? If not - I'll crank 'er open.

Thanks for the reply - this has been driving me (and my wife) crazy...If it was my Regal, I know all the specs that the sensors should read... On the Crown Vic, I'm lost...