High idle after long drive

[southaussie]

Hi peeps,

Took my baby for a drive to Renmark and on the way home I noticed that at 110kph I took my foot off the acc. and it was like I had cruise control. (which I don't)

So I knocked it into neutral as I was free of traffic and the rpm was sitting at 2000-3000.

I pulled over and after a while it dropped to 1500 then after longer wait it dropped back to lower idle. This was at Truro.

By the time I got home it was still at 2500rpm.

If it went back to idle 700-900rpm and I lightly tapped the accelerator it would go straight back up to 2500rpm.

I don't know what's happened. Tried disconnecting the air temp sensor just to test if it was reading wrong temp but no difference.

Also when I was in Renmark and I started the car, at idle it would be ok but surge up then drop back down again to idle. Which was unusual also.

Please post your ideas.

[nathanVY]

Hmmm maybe a vacuum leak or the IAC playing funny buggers? Did it actually accelerate forward when you took your foot of the pedal? and then you put it into neutral?? thats insane lol.

[DLFHUB666]

Check your PCV hose for holes, your IAC an TPS may need replacing.

[southaussie]

Cheers guys will look into it tomorrow and let ya's know how I go

[southaussie]

Any pointers on where to find?