engine revs up

[mstngcbra42]

I got and idle problem with my stang. When i start it up the car idles just fine. After about 5 minutes of driving engine revs up to about 1500 rpm then to 2000 rpm. I turn the car off and turn it back on and the idle goes back to normal. I cleaned the air bypass valve with carb cleaner, but it hasnt made a difference. O2 sensors are new along with fuel regulator. Any suggestions??

 

[DW5.0L]

Check the accelerator cable linkage directly underneath EGR spacer. I have the same problem. I noticed that I am missing the clip ( ford part #9D726) that holds the other cable( ford part #9A825) in place. My engine never raced prior to losing that clip.

Any other ideas?

 

[dstanggt50]

When it idles high, unplug the tps, is the idle comes down with it unplugged, try adjusting or replacing tps. (Thats what happened to my 87 gt, same issues.

 

[mstngcbra42]

I will try that, but also about 3 weeks back i had a short which i took care of, but when i pulled the codes and i got a 40 and a 12. I know the read that the 12 is for idle speed solenoid. Thats the reason why i cleaned the IAB. Also on deceleration the engine hesitates. When i throttle up it feels fine.

 

[BrutalStang]

if it hesitates on deceleration then its probably the accelerator cable linkage.

 

[mstngcbra42]

I unplugged the TPS and it started to Idle fine, but i got a check engine Light. So it is the TPS. How is the tps adjusted??