Jeep Cherokee Forum

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech
Register Forgot Password?
Search

Welcome to Cherokee Forum!
Welcome to Cherokee Forum,

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread Display Modes
Old 10-20-2008, 01:58 PM   #1
CF Veteran
 
tampaviking's Avatar
 
Join Date: Sep 2008
Location: Ft. Lewis, Wa
Posts: 1,051

View tampaviking's Photo Album My Photos
1987 Cherokee
Default High Idle but only in park

It takes a bit to start and then idles like crazy in park. But as soon as I put it in gear it smooths out to normal. The inside of the intake manifold is pretty dirty from the blow-by, but that is fixed now. It has been doing it since I got home. And there is no problems that I have noticed while driving. It just happens in park.
tampaviking is offline   Reply With Quote
Old 10-20-2008, 02:04 PM   #2
Senior Member
 
CodeXJ's Avatar
 
Join Date: Oct 2008
Location: Port Orange, FL
Posts: 871

View CodeXJ's Photo Album My Photos
1993, 1994 Cherokee
Default

Probably the same in Neutral, when there is no load on the engine.

I'd pull the throttle body and give it a good cleaning. A new base gasket is like $2.50, a can of carb cleaner is $4, and a cheap toothbrush can go a long way. Specifically, get the ICV ports cleaned out. If it's sticking open a little, you'll have a high idle. If it's sticking closed, you'll have hard starts.

Did wonders for the starting/idle on mine.
__________________
48hrs must pass before a person may be considered missing, longer if they own a Jeep.


1993 White 4-door. Bone stock 2wd, for now.
1994 Red 2-door. Parts rust bucket and 4wd donor.
2008 GSXR-750, black and orange, akrapovic shorty, 6k HID, CRG bar end mirrors, PUIG Windscreen.
CodeXJ is offline   Reply With Quote
Old 10-20-2008, 04:37 PM   #3
Senior Member
 
seed's Avatar
 
Join Date: Sep 2008
Location: pa
Posts: 772

View seed's Photo Album My Photos
2000 Grand Cherokee
Default

does an 87 cherokee have a throttle position sensor?my 89 f150 did the exact same thing and it was the tps
__________________
2000 laredo lifted & stuff
seed is offline   Reply With Quote
Old 10-20-2008, 04:45 PM   #4
Senior Member
 
CodeXJ's Avatar
 
Join Date: Oct 2008
Location: Port Orange, FL
Posts: 871

View CodeXJ's Photo Album My Photos
1993, 1994 Cherokee
Default

Ah, crap, it's an '87. Didn't even see that. I dunno.
__________________
48hrs must pass before a person may be considered missing, longer if they own a Jeep.


1993 White 4-door. Bone stock 2wd, for now.
1994 Red 2-door. Parts rust bucket and 4wd donor.
2008 GSXR-750, black and orange, akrapovic shorty, 6k HID, CRG bar end mirrors, PUIG Windscreen.
CodeXJ is offline   Reply With Quote
Old 10-20-2008, 05:27 PM   #5
Renix Super Guru
 
BlueXJ's Avatar
 
Join Date: Mar 2008
Location: In yourz postez fissin jurr spelinzs
Posts: 24,537

View BlueXJ's Photo Album My Photos
1990XJ/1989MJ Cherokee
Send a message via Yahoo to BlueXJ
Default

Yes it is a Renix and has a TPS and an IAC also called the Idle stepper motor. I would bet the IAC has never been off to be cleaned. If you take it off(T-10 torx) be very gentle with the idle pintle. That is easily damaged. If cleaning the IAC does not improve your idle then post back up and we can then try some more complicated fixes.
Click the image to open in full size.
__________________
JEEP I bow to its almighty power which no mortal 4x4 can match.
R.I.P. Zachman you will be missed.
CF the friendly forum
R.I.P. Brian (96_XJ) Perinne

CBW Member #69
BlueXJ is offline   Reply With Quote
Old 10-20-2008, 05:37 PM   #6
Senior Member
 
CodeXJ's Avatar
 
Join Date: Oct 2008
Location: Port Orange, FL
Posts: 871

View CodeXJ's Photo Album My Photos
1993, 1994 Cherokee
Default

Quote:
Originally Posted by BlueXJ View Post
Yes it is a Renix and has a TPS and an IAC also called the Idle stepper motor. I would bet the IAC has never been off to be cleaned. If you take it off(T-10 torx) be very gentle with the idle pintle. That is easily damaged. If cleaning the IAC does not improve your idle then post back up and we can then try some more complicated fixes.

Just as a note, when I cleaned the IAC on my '93, just cleaning the plunger didn't help. I had to remove the entire throttle body and clean the chamber out, it was full of a tar-like substance.
__________________
48hrs must pass before a person may be considered missing, longer if they own a Jeep.


1993 White 4-door. Bone stock 2wd, for now.
1994 Red 2-door. Parts rust bucket and 4wd donor.
2008 GSXR-750, black and orange, akrapovic shorty, 6k HID, CRG bar end mirrors, PUIG Windscreen.
CodeXJ is offline   Reply With Quote
Old 10-20-2008, 05:43 PM   #7
Renix Super Guru
 
BlueXJ's Avatar
 
Join Date: Mar 2008
Location: In yourz postez fissin jurr spelinzs
Posts: 24,537

View BlueXJ's Photo Album My Photos
1990XJ/1989MJ Cherokee
Send a message via Yahoo to BlueXJ
Default

Quote:
Originally Posted by CodeXJ View Post
Just as a note, when I cleaned the IAC on my '93, just cleaning the plunger didn't help. I had to remove the entire throttle body and clean the chamber out, it was full of a tar-like substance.
That happens when a Jeep sits for an extended period of time and seafoam can usually clean it without disassembly. Sry you had to take your apart.

Hope it runs well now Code.
__________________
JEEP I bow to its almighty power which no mortal 4x4 can match.
R.I.P. Zachman you will be missed.
CF the friendly forum
R.I.P. Brian (96_XJ) Perinne

CBW Member #69
BlueXJ is offline   Reply With Quote
Old 10-20-2008, 05:53 PM   #8
Senior Member
 
CodeXJ's Avatar
 
Join Date: Oct 2008
Location: Port Orange, FL
Posts: 871

View CodeXJ's Photo Album My Photos
1993, 1994 Cherokee
Default

Quote:
Originally Posted by BlueXJ View Post
That happens when a Jeep sits for an extended period of time and seafoam can usually clean it without disassembly. Sry you had to take your apart.

Hope it runs well now Code.
Runs great, thanks!

Wasn't a big issue, unhook two electrical connections, unscrew like 8 torx bolts, and a new gasket.
__________________
48hrs must pass before a person may be considered missing, longer if they own a Jeep.


1993 White 4-door. Bone stock 2wd, for now.
1994 Red 2-door. Parts rust bucket and 4wd donor.
2008 GSXR-750, black and orange, akrapovic shorty, 6k HID, CRG bar end mirrors, PUIG Windscreen.
CodeXJ is offline   Reply With Quote
Old 10-20-2008, 06:14 PM   #9
Renix Super Guru
 
BlueXJ's Avatar
 
Join Date: Mar 2008
Location: In yourz postez fissin jurr spelinzs
Posts: 24,537

View BlueXJ's Photo Album My Photos
1990XJ/1989MJ Cherokee
Send a message via Yahoo to BlueXJ
Default

Quote:
Originally Posted by CodeXJ View Post
Runs great, thanks!

Wasn't a big issue, unhook two electrical connections, unscrew like 8 torx bolts, and a new gasket.
They have a tendancy to leak at the gasket surface and will often run worse than before the cleaning. That's why I always suggest the Seafoam to keep from breaking the gasket seals. You either were very diligent in cleaning the two surfaces or you got lucky. Either way I'm glad it is running well now.
__________________
JEEP I bow to its almighty power which no mortal 4x4 can match.
R.I.P. Zachman you will be missed.
CF the friendly forum
R.I.P. Brian (96_XJ) Perinne

CBW Member #69
BlueXJ is offline   Reply With Quote
Old 10-20-2008, 06:54 PM   #10
Senior Member
 
seed's Avatar
 
Join Date: Sep 2008
Location: pa
Posts: 772

View seed's Photo Album My Photos
2000 Grand Cherokee
Default

typically,i believe, a bad idle air control,much like a bad egr valve will cause stalling at idle
__________________
2000 laredo lifted & stuff
seed is offline   Reply With Quote
Old 10-20-2008, 06:59 PM   #11
Renix Super Guru
 
BlueXJ's Avatar
 
Join Date: Mar 2008
Location: In yourz postez fissin jurr spelinzs
Posts: 24,537

View BlueXJ's Photo Album My Photos
1990XJ/1989MJ Cherokee
Send a message via Yahoo to BlueXJ
Default

Quote:
Originally Posted by seed View Post
typically,i believe, a bad idle air control,much like a bad egr valve will cause stalling at idle
If the pintle sticks it can cause either. It depends on if it sticks in or out. That sounded bad but you understand if you have had one apart to clean it.
__________________
JEEP I bow to its almighty power which no mortal 4x4 can match.
R.I.P. Zachman you will be missed.
CF the friendly forum
R.I.P. Brian (96_XJ) Perinne

CBW Member #69
BlueXJ is offline   Reply With Quote
Old 10-20-2008, 07:18 PM   #12
CF Veteran
 
tampaviking's Avatar
 
Join Date: Sep 2008
Location: Ft. Lewis, Wa
Posts: 1,051

View tampaviking's Photo Album My Photos
1987 Cherokee
Default

When I bought it I checked the air filter first to see how bad the blow-by was, and it had a bit of oil in it. So now that line just goes into a cut-up bottle by the air intake. I pulled the throttle body off and cleaned it out and the IAC. But there is still a buttload of tar in the intake manifold. I want to seafoam in but it would be hard to do on post with the reported white cloud that comes out. But also I didn't replace the gasket to the throttle body. I know my fault. So do you think it might be cause the gasket is pretty much crap. And I also snagged a multi meter today to take care of the TPS.
tampaviking is offline   Reply With Quote
Old 10-20-2008, 07:20 PM   #13
Senior Member
 
CodeXJ's Avatar
 
Join Date: Oct 2008
Location: Port Orange, FL
Posts: 871

View CodeXJ's Photo Album My Photos
1993, 1994 Cherokee
Default

Quote:
Originally Posted by tampaviking View Post
When I bought it I checked the air filter first to see how bad the blow-by was, and it had a bit of oil in it. So now that line just goes into a cut-up bottle by the air intake. I pulled the throttle body off and cleaned it out and the IAC. But there is still a buttload of tar in the intake manifold. I want to seafoam in but it would be hard to do on post with the reported white cloud that comes out. But also I didn't replace the gasket to the throttle body. I know my fault. So do you think it might be cause the gasket is pretty much crap. And I also snagged a multi meter today to take care of the TPS.
If the gasket is leaking, it's going to run funky. Autozone has them for like $2.50.
__________________
48hrs must pass before a person may be considered missing, longer if they own a Jeep.


1993 White 4-door. Bone stock 2wd, for now.
1994 Red 2-door. Parts rust bucket and 4wd donor.
2008 GSXR-750, black and orange, akrapovic shorty, 6k HID, CRG bar end mirrors, PUIG Windscreen.
CodeXJ is offline   Reply With Quote
Old 08-15-2011, 08:54 AM   #14
Newbie
 
Join Date: Aug 2011
Posts: 2

View 2008 hemi jeep's Photo Album My Photos
Cherokee
Default

My 2008 hemi does this hi idle every time it is started . Dirty TB ?
2008 hemi jeep is offline   Reply With Quote
Old 08-15-2011, 04:12 PM   #15
::Regional Moderator::
 
cruiser54's Avatar
 
Join Date: Aug 2011
Location: Prescott, Az
Posts: 23,367

View cruiser54's Photo Album My Photos
1990 Comanche
Default

Quote:
Originally Posted by tampaviking View Post
When I bought it I checked the air filter first to see how bad the blow-by was, and it had a bit of oil in it. So now that line just goes into a cut-up bottle by the air intake. I pulled the throttle body off and cleaned it out and the IAC. But there is still a buttload of tar in the intake manifold. I want to seafoam in but it would be hard to do on post with the reported white cloud that comes out. But also I didn't replace the gasket to the throttle body. I know my fault. So do you think it might be cause the gasket is pretty much crap. And I also snagged a multi meter today to take care of the TPS.
Replace the gasket. PM me your email address and I'll send you a simple tutorial on how to check and adjust your TPS with a voltmeter.

Anyone else want it, do the same.
cruiser54 is online now   Reply With Quote
Old 08-15-2011, 04:12 PM
 
 
 
submit to reddit
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
y dive on park-way but park on drive-way bamorgan7 Off-Topic Discussion 5 11-27-2008 01:48 PM
High Idle 89Pioneer OEM Cherokee Tech 1 11-05-2008 12:42 PM
Will Not Start in Park caddydaddy1027 OEM Cherokee Tech 8 10-24-2008 12:44 AM
High Idle jeepride OEM Cherokee Tech 2 08-03-2008 06:07 PM
Powerline Park jonb8 Trail Reports 11 05-27-2008 08:42 PM

Go Back   Jeep Cherokee Forum > Technical Discussion > OEM Cherokee Tech



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 03:04 PM.


This site is in no way affiliated with Jeep or Chrysler.

Emails Backup