High Idle when weather is nice.

Junker · 06-12-2006, 11:57 AM

I forgot about this problem because it went away when winter came but now that it's getting warmer it's starting to come back. It's directly related to the outside temperature.

Normally whenever I start my jeep it idles high for a few seconds then settles down to a comfortable level.

However when it's a warm day out it is inevitable that it will remain at a high RPM after starting it and never "settle down" as I would normally expect.

I can tell even before I start it whether or not it will do it by whether it's a hot or cool day... very predictable.

I have a standard tranny and it idles higher than I would normally want it when I take off from a stop. Then when I pull into a parking space and am going slow I push in the clutch and brake to stop and the motor rev's up since it's no longer under a load.

Thanks.

ki1022 · 06-12-2006, 12:43 PM

It's just your Jeep's way of saying it likes the nice weather.

Just kidding......but I am having the exact opposite problem. My idles high when its cold.

WMW0505 · 06-12-2006, 01:17 PM

i would say that it idles high when its cold b/c its just tryin to warm up...like a choke does. i have no idea why it would idle high when its nice outside though

beep_beep_jeep · 06-12-2006, 01:35 PM

Is there a check engine Light on? Do you ever notice black smoke coming from the tail pipe? Is it on the 90 or the 88 ?
could be an idle sensor?

Junker · 06-12-2006, 05:38 PM

Quote:

Originally Posted by beep_beep_jeep

Is there a check engine Light on? Do you ever notice black smoke coming from the tail pipe? Is it on the 90 or the 88 ?
could be an idle sensor?

No check engine light... but then again I've never seen that one so maybe it doesn't work. No black smoke. It's the 1990. It did it again today, not looking forward to a whole summer of it.

mud-dog27 · 06-12-2006, 06:01 PM

its one of those jeep things mine does its aswell.......you start it revs to like 3000RPM sticks.....you kill it......start it again does the same thing.......then third times a charm ...... ive gotten used to it however i have noticed that it wont do it for a while after i give my TB a slight cleaning and oiling......so give that a try spray it down with carb cleaner and oil the linkage and such

90lerado · 06-12-2006, 06:05 PM

check your TPS. common problem on the cherokees.

mud-dog27 · 06-12-2006, 08:21 PM

even after i replaced mine it still did it

RickyN29 · 06-13-2006, 02:22 AM

Damn, my 90 does the same thing. It seems when the engine bay warms up (so warmer intake temps and such) mine idles higher. When it is cold, it nearly stalls!

There must be some sort of intake air temp sensor that is wigging out on us. Do let us know what you find, I will do the same.

clifsmith · 06-13-2006, 11:34 AM

mine does the same, except that it does it when the engine is hot and I turned it off and it sits for at least 5 minutes and I restart it and the idle is at 3000rpm. I have replaced the TPS and cleaned the idle controller and cleaned the throttle body. I don't know what else it can be, but it will ruin my tranny soon cause I have to put it in gear at that high rpm. anyone have a solution????????

06-12-2006, 12:43 PM	#2
ki1022 Registered User Join Date: Oct 2005 Location: Philadelphia, PA Posts: 664 Profile Gallery Classifieds My Jeeps	It's just your Jeep's way of saying it likes the nice weather. Just kidding......but I am having the exact opposite problem. My idles high when its cold. __________________ 94' XJ

06-12-2006, 06:05 PM	#7
90lerado Registered User Join Date: May 2003 Location: Salem MA Posts: 1,105 Profile Gallery Classifieds My Jeeps	check your TPS. common problem on the cherokees. __________________ "Few men are killed by the bayonet, many are scared by it. Bayonets should be fixed when the fire fight starts" - General George Patton Jr, "War as I knew it" 1947 new vehicles:1996 Ford F150 5.0l 4X4 with a plow.

06-13-2006, 02:22 AM	#9
RickyN29 Registered User Join Date: Apr 2004 Location: San Jose, CA Posts: 1,487 Profile Gallery Classifieds My Jeeps	Damn, my 90 does the same thing. It seems when the engine bay warms up (so warmer intake temps and such) mine idles higher. When it is cold, it nearly stalls! There must be some sort of intake air temp sensor that is wigging out on us. Do let us know what you find, I will do the same. __________________ 1990 XJ Laredo 4x4 Auto Rusty's ~6" Lift Dana30/Dana44 3.55's Pacer Wheels/High-Tec Retreads 31" MT KargoMaster Safari Rack CSF Open Cooling System Conversion Hayden Tranny Cooler Flowmaster 40 Delta & High-Flo Cat PORC SYE / FRT DS Combo *The Doors are off again for summer!

06-13-2006, 11:34 AM	#10
clifsmith Registered User Join Date: May 2006 Location: Nashville, TN Posts: 13 Profile Gallery Classifieds My Jeeps	mine does the same, except that it does it when the engine is hot and I turned it off and it sits for at least 5 minutes and I restart it and the idle is at 3000rpm. I have replaced the TPS and cleaned the idle controller and cleaned the throttle body. I don't know what else it can be, but it will ruin my tranny soon cause I have to put it in gear at that high rpm. anyone have a solution????????