[Ford5.0]

Sometime when i start the car, it tends to idle up to 2 grand or between shifts when the clutch is in, the idle air control valve an a vaccum line has been replaced to fix the problem didnt fix...need some help thanks,

 

[Chris951]

vacuum leak. also set the TPS voltage

 

[dr.gonzo!]

When you start the car and its cold the car will hold a high rev on purpose for a while in warm up mode.

You can check to see if it is a vacuum leak by spraying carb cleaner around vacuum lines and gaskets.

 

[sickfox]

Did you go through the steps in the sticky also?


Mine does the high idle after i drive on highway, But i parked it for the year.

 

[86FoxBody]

Mine had the same thing.

 

[ddarkslayer]

mine only did it because I had a bad fuel pump and It would only do it at the end of warm up mode. then changed the fuel pump to a 255 walbro and now I didn't have to worry but if it does that when you first start up then its the idle air control valve a vaccum leak and the egr valve or the tps also try to pull out as many codes out as possible

 

[dr.gonzo!]

Mine usually wants to idle real low after warming up. Sometimes too low lol I have the 255 too

 

[ddarkslayer]

well as long as my fuel pressure is 39psi then I'm good

 

[mustangmad]

Make a new iac retaining gasket with felpro 3157 gasket paper. Leave the hole on the air intake side 5/8 but on the engine side make it 5/16 this has fixed 2 of my stangs