when i first start my truck, the engin is at 2,000-2,250 RPM's. i rev it some and it still stays the same. then after ideling for about 5 min, the RPM's go down to about 750. RPM's stays at 750 for about a minute and then goes back up to 2,000-2,250 RPM's. does anyone know what is wrong?

 

if youre still under warranty, i would take it back in

 

sounds like the idle sensor to me. thats what was wrong with mine... among other things.

 

try re setting the computer

 

mine does that when the A/c clicks on its horrible...

 

its the IAC, let the dealer fix it, im sure its still nder warranty

 

yep its still under warranty. i'll call the dealer when i get home from school

 

i had that same probably but i was told it was the IAC but when i took it to a shop they said it was a vacuum hose had a hole in it

 

it could be a few things, and IAC, or a vacuum leak .... could be a dirty maf, mine had a high idle, replaced the IAC, checked for vacuum leaks, and cleaned my maf, still had a high idle, then a week later the TPS took a ****, truck wouldnt start due to it sending a signal of WOT so there was no injector pulse, anyways I replaced that and the High Idle went away ... i never thought a tps would cause that ... ... but i would take it to the dealer .... good luck!

 

yea mine does the same thing, but it goes up and down, and going in reverse it gets really low, Anybody have a clue what it is? 4.0 running in mine.

 

Look at the posts above you...


Also, whats the rpm ranger happening for you. If its goin up and down with a clicking sound and its not a big difference it is most likely just A/C compressor kicking on and off. Going into reverse would make it go low(altho i dont know how low really low is).

Aaron

 

just like im at a stoplight, it idles down and up, with the a/c off, i heard somthing about the air flo sensor, but i cant figure it out

 

How much rpm is it changing?

I don't remember if this is right, but I believe the air compressor still works when you're driving, that it needs to maintain pressure.

Aaron