thebrow89

my parents ahve a 2004 grand cherokee wit a 4.0. and when u start it sometimes it reves up to about 3000 rpm and stays there for a few min and then finally settles back down. what can make it do this?

parkerbabco

stays there for litterally a few minutes?? what if you start driving it around right when you turn it on does it stay at 3 grand when you put it in drive??

thebrow89

it stays there for 2 or 3 min. and when i put it in drive and keep my foot on the brake it runs about 1800

OverlandZJ

This is a typical symptom of a bad Throttle Position Sensor (TPS)

thebrow89

that was kinda what i thought to. is there anyway to test a tps?

RRAM

Yep go to chrysler and pay them 100bucks for the sensor and change it. if it works your good to go.
But to encourage you I would say that will fix it. I had the same issue with mine. I used to try to take off while sitting at a red light. That was kinda the last straw for me so I swapped it out. takes about 10 to change. No issues since.

they would probably charge you as much to test it.

seed

i believe there is a way to test with a multi meter,tho i'm unsure what the readings should be.... bad IAC could also be a cause

thebrow89

yea thats what one of the guys i worked with said. is there a way to kno if thats bad i dont really kno much bout it.

ol"blue

Take it to Advance Auto Parts and have them scan the ECM for any stored codes. There's no charge.

seed

my haynes says .20-.90 closed throttle,4.5 volts wide open