1993 Ford Crown Vic

[flech01]

I have a 1993 Ford Crown Vic 4.6L V8. I started it up today and it wont idle. It revs up to normal idle and then almost dies then back up to normal idle. It will keep doing this until I put it in gear then it will idle fine. It does this hot or cold. <br /><br />I have removed the Idle Control Valve and cleaned it but no diffrence.<br />I have inspected all the vacuum lines and they are all good.<br /><br />Pcv valve is fine.<br /><br />Any help would be great. Thanks

 

[jimr]

Re: 1993 Ford Crown Vic

probably it is the IAC cleaning them doesn't always fix them they do go bad.

 

[flech01]

Re: 1993 Ford Crown Vic

Is there a way to test the IAC before I throw parts and money at it.

 

[flech01]

Re: 1993 Ford Crown Vic

Ok I have a manuel and I will test what I can. It only says that there should be 10.5 volts to the IAC. If that checks out and the unit is clean how do I know that it is realy bad and its not something else?<br /><br />Also it seams at times while driveing the car loses power but when I press the gas more it go just fine?<br /><br />Will the IAC cause this. I'm tring to rule out other thing before I buy all these parts.

 

[DJ]

Re: 1993 Ford Crown Vic

Look at your throttle butterfly also. If it is sticky, or held slightly open from dirt, the IAC can't control the idle.

 

[flech01]

Re: 1993 Ford Crown Vic

Ok guys I got it fixed. WOOOOOOOO HOOOOOOO It turns out it was The PCV valve. I looked at it before anything else but didn't realise it was sticking. I will install a new one today. <br /><br />Thanks for the help.<br /><br />Hey I have a nice clean IAC now. <br /><br />Thansk again.

 

[DJ]

Re: 1993 Ford Crown Vic

Good. My next thought was vacuum leak. Which a stuck PCV is.