High Idle on 2000 Sable Wagon w/duratec

[taniamarie]

My son has a 2000 Sable Wago with the Duratec engine it is idling high and the check engine light has just come one. Does anyone have any suggestions of what it might be? The car runs smooth, shifts great, very comfortable besides what I mentioned and it does seem a bit loud, but I assume that's from the high idle.

[taniamarie]

I was able to get the code from Autozone today. It says P1506 IAC valve failed or Engine Vacuum Leak. I think that the IAC valve might has just been replaced, but I am not sure, if someone can tell me where it's located it might help. There is a new part coming off of the top right of the engine??? I am not sure if this is it. Can anyone tell me the severity of this code and what type of costs I am looking at?

[huminski]

IAC could be the cause, it's the valve on top if the intake toward the right of the engine looking from the front.

If it's a vacuum leak, check the large PCV hose that comes off under the intake, almost directly under the IAC. It has a large rubber elbow, that fits to a 1/2" hard plastic line, then back to a 1/2" rubber hose to the pcv valve. The elbow is pretty notorious for degraging due to the hot oil vapor that gets pulled in from the PCV, and it begins to leak, causing a major vacuum leak. Might be tough to take off without removing the upper intake, but it's not hard at all to remove the intake. 8 6mm studs, a couple vacuum lines, and two 6mm bolts on the throtle body. Also two 8mm bolts on the EGR.

Get it idling, then spray some starting fluid or carb cleaner on the elbow. If your idle changes you have a vacuum leak there. If not there, spray around other vacuum hoses and around the intake mounting area, anywhere spraying the cleaner or starting fluid causes an idle change, you have a leak.

Hope this helps, I've just gone thru a similar problem with my duratec sable.

[DistanceGuy1]

ID the part via this link.
http://www.eccentrix.com/members/tel.../3LDuratec.htm