Very Low idle..... - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today



Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 06-03-2010, 04:58 PM   #1
Jeeper
 
Join Date: Mar 2010
Location: Connecticut
Posts: 449
97'wrangler is on a distinguished road
Very Low idle.....

I no this question has been asked like a thousand times, but i can't find the threads...
My TJ has a very low idle almost to the point of stalling, it shakes a lot and it feels like it wants to stall.
Can anyone help me out and tell me how i can fix this?

I no my way around carb. engines, and how to adjust the idle on them, but i don't no to much about fuel injected idle adjustments..
And suggestions!
97'wrangler is offline   Quote
Old 06-03-2010, 05:50 PM   #2
Jeeper
 
Indy's Avatar
 
Join Date: Jun 2009
Location: Bay Area
Posts: 569
Indy is on a distinguished road
Try cleaning the throttle body and IAC (Idle Air Control). Make sure you clean IAC passage inlet, IAC module connectors. You can also remove the IAC module and clean it as well.

Attachment 19911

__________________
98 TJ with 5.3 and 4L60E, HPD30/D44, 4.56, Detroit Locker in rear axle, 4 inch SL, 1.25BL, 35x12.50x15, Cager Softs 15x8
Indy is offline   Quote
Old 06-03-2010, 06:13 PM   #3
Jeeper
 
Join Date: Mar 2010
Location: Connecticut
Posts: 449
97'wrangler is on a distinguished road
Is it the same way on a 4 Cyl.
97'wrangler is offline   Quote
Old 06-03-2010, 06:41 PM   #4
Jeeper
 
Indy's Avatar
 
Join Date: Jun 2009
Location: Bay Area
Posts: 569
Indy is on a distinguished road
Exactly the same!
__________________
98 TJ with 5.3 and 4L60E, HPD30/D44, 4.56, Detroit Locker in rear axle, 4 inch SL, 1.25BL, 35x12.50x15, Cager Softs 15x8
Indy is offline   Quote
Old 06-03-2010, 08:39 PM   #5
Jeeper
 
For_4x4's Avatar
 
Join Date: May 2010
Posts: 61
For_4x4 is on a distinguished road
i had a high idle on my old 97, turned out to be bad throttle position sensor.

i hope its that simple for ya
__________________
02' TJ Sport, 4.0 I-6, NV3550, D44 rear
2'' Rubicon Express, 32x11.50 Cooper STT
For_4x4 is offline   Quote
Old 06-03-2010, 08:46 PM   #6
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 42,035
Jerry Bransford is on a distinguished road
The IAC is what provides the engine with all its air at idle so when you have idle issues, odds are it's a dirty IAC. Clean the interior of the throttle body with an aerosol throttle body cleaner with the engine running and get some of the spray into the idle air control passage inlet so it will be drawn through the IAC port. In fact, it is the IAC and computer that controls the engine rpm, there is no idle adjustment.

If it's not a dirty IAC, the next thing to be suspicious of would be the TPS (throttle position sensor). However, if it is the TPS, it cannot be cleaned like the IAC can, it must be replaced when it goes bad.
__________________
When you have a choice, buy American.
Jerry Bransford is offline   Quote
Old 06-07-2010, 05:13 PM   #7
Jeeper
 
Join Date: Mar 2010
Location: Connecticut
Posts: 449
97'wrangler is on a distinguished road
Quote:
Originally Posted by Jerry Bransford View Post
The IAC is what provides the engine with all its air at idle so when you have idle issues, odds are it's a dirty IAC. Clean the interior of the throttle body with an aerosol throttle body cleaner with the engine running and get some of the spray into the idle air control passage inlet so it will be drawn through the IAC port. In fact, it is the IAC and computer that controls the engine rpm, there is no idle adjustment.

If it's not a dirty IAC, the next thing to be suspicious of would be the TPS (throttle position sensor). However, if it is the TPS, it cannot be cleaned like the IAC can, it must be replaced when it goes bad.
If it is the TPS, Is there any way for me to find out for sure before i buy a new one, or will i have to buy a new one and hope i didn't waste my money on it?

And i have been experiencing that when ever i go to start my jeep, and i back out of my drive way and start to build of speed in 1st gear, it starts to sputter and backfire and wants to stall. When that happens, i push down the clutch and rev up to about 4000 RPM's and then start going again and it doesn't happen again until i shut it off for a little while. What could be causing this? a bad fuel filter?
97'wrangler is offline   Quote
Old 06-07-2010, 05:17 PM   #8
Jeeper
 
Indy's Avatar
 
Join Date: Jun 2009
Location: Bay Area
Posts: 569
Indy is on a distinguished road
When was the last time you replaced spark plugs, distributor cap and rotor?
__________________
98 TJ with 5.3 and 4L60E, HPD30/D44, 4.56, Detroit Locker in rear axle, 4 inch SL, 1.25BL, 35x12.50x15, Cager Softs 15x8
Indy is offline   Quote
Old 06-07-2010, 05:20 PM   #9
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 42,035
Jerry Bransford is on a distinguished road
Quote:
Originally Posted by 97'wrangler View Post
If it is the TPS, Is there any way for me to find out for sure before i buy a new one, or will i have to buy a new one and hope i didn't waste my money on it?

And i have been experiencing that when ever i go to start my jeep, and i back out of my drive way and start to build of speed in 1st gear, it starts to sputter and backfire and wants to stall. When that happens, i push down the clutch and rev up to about 4000 RPM's and then start going again and it doesn't happen again until i shut it off for a little while. What could be causing this? a bad fuel filter?
If the problem isn't cured by cleaning the IAC as recommended as a first step, odds are very good the problem is caused by the TPS. I always like to try the easist/cheapest/most-likely fixes first & only after that doesn't work, go to something that costs more $$$. Cleaning the IAC as a first step & only buying & installing a new TPS afterwards if cleaning the IAC doesn't fix it seems like a good way to go.
__________________
When you have a choice, buy American.
Jerry Bransford is offline   Quote
Old 06-07-2010, 08:38 PM   #10
Jeeper
 
Join Date: Mar 2010
Location: Connecticut
Posts: 449
97'wrangler is on a distinguished road
My spark plugs not to long ago,and they look in fine shape. but i'm not sure about the distributor, is there a way to check and see if i need to change it without buying a new one first?
97'wrangler is offline   Quote
Old 06-07-2010, 08:48 PM   #11
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 42,035
Jerry Bransford is on a distinguished road
Have you cleaned the IAC that was first suggested to you last Thursday? If not, why are you asking about things like the distributor when you haven't yet tried the free and easy stuff that is the most likely to be causing your problem?
__________________
When you have a choice, buy American.
Jerry Bransford is offline   Quote
Old 06-07-2010, 10:28 PM   #12
Jeeper
 
Join Date: Aug 2008
Posts: 2,473
rrich is on a distinguished road
I have a customer like that --- "I don't want it to be that simple."

Now I just send him down the road.
__________________
It's no wonder the country is falling apart - stupidity abounds!
rrich is offline   Quote
Old 06-08-2010, 07:40 PM   #13
Jeeper
 
Join Date: Mar 2010
Location: Connecticut
Posts: 449
97'wrangler is on a distinguished road
i have already cleaned it... didn't help!
97'wrangler is offline   Quote
Old 06-08-2010, 08:03 PM   #14
Jeeper
 
Indy's Avatar
 
Join Date: Jun 2009
Location: Bay Area
Posts: 569
Indy is on a distinguished road
You can remove the distributor cap (make sure to mark the wires!!) and clean the pins inside. Clean the rotor as well. See if that helps.

Also, the new ones are not very expensive. Distributor cap and rotor total are less than 30 bucks. If you are going to get new distributor cap and rotor, get the ones with brass contacts. They will last a lot longer.
__________________
98 TJ with 5.3 and 4L60E, HPD30/D44, 4.56, Detroit Locker in rear axle, 4 inch SL, 1.25BL, 35x12.50x15, Cager Softs 15x8
Indy is offline   Quote
Old 11-16-2010, 10:49 PM   #15
Newb
 
Join Date: Aug 2010
Posts: 3
Red/Black is on a distinguished road
Hi everybody.
I have a 1993 manual Jeep Wrangler. It started to develop problems during the last week or so...
Everytime I am in neutral or standing on the clutch the idle goes down as much, that everynow and then ist stall. My housemate knows his way arond engines and he said to adjust the idle, but he never done it on a jeep and couldn't figure it out.
There is also a loud clicking coming from the engine when it is running. Could there be a connection??
We also cleaned the spark plugs (is that how you call them?) but it doesn't help.

I would really appreciate your help!!
Red/Black is offline   Quote
Old 11-16-2010, 11:00 PM   #16
Jeeper
 
jasonwrangler's Avatar
 
Join Date: Oct 2010
Location: Omaha, NE
Posts: 892
jasonwrangler is on a distinguished road
Quote:
Originally Posted by Red/Black View Post
Hi everybody.
I have a 1993 manual Jeep Wrangler. It started to develop problems during the last week or so...
Everytime I am in neutral or standing on the clutch the idle goes down as much, that everynow and then ist stall. My housemate knows his way arond engines and he said to adjust the idle, but he never done it on a jeep and couldn't figure it out.
There is also a loud clicking coming from the engine when it is running. Could there be a connection??
We also cleaned the spark plugs (is that how you call them?) but it doesn't help.

I would really appreciate your help!!
you should go to CJ forums since TJ is all fuel injection. YJ is carbed so its kinda different.
jasonwrangler is offline   Quote
Old 11-17-2010, 12:05 AM   #17
Jeeper
 
Join Date: Aug 2008
Posts: 2,473
rrich is on a distinguished road
When you first start it, the computer isn't on line yet. A vacuum leak can drop the idle till it warms up a little and the computer starts working - compensating for the vacuum leak.

Test it by choking off the air at the TB with your hand when you first start it cold. If it runs better for a moment, it's a leak.

Spray a burnable carb cleaner around the TB baseplate, the intake manifold gasket, and the hoses going to the vacuum fitting on the manifold. Look for an RPM change when you hit the leak.

Testing and diagnosing is cheaper and more effective than throwing parts at it.
rrich is offline   Quote
Old 02-26-2011, 11:01 AM   #18
Jeep Ninja

WF Supporting Member
 
scgeek12's Avatar
 
Join Date: Feb 2011
Location: Norfolk VA
Posts: 1,827
scgeek12 is on a distinguished road
i know this thread is a little old but wanted to thank you all anyway! g/f went to drive my 99 tj this morning and it wouldnt start for her, i got it running but had to use the gas a bit to get it going, and it was idling around 300rpms, if you can even call that an idle lol, anyway found this thread and tried cleaning out the IAC with some throttle body spay, died the first few times but i started giving it some gas with the throttle while spraying it after about 10 short sprays it was running perfect, drove it for 5 hours on the highway after that no problem, thanks!
scgeek12 is offline   Quote
Old 03-28-2011, 06:18 PM   #19
Newb
 
Join Date: Mar 2011
Posts: 1
jeepermnksco is on a distinguished road
so did it ever work out for you '97 wrangler?
jeepermnksco is offline   Quote
Old 06-28-2012, 11:49 PM   #20
Newb
 
pruimtime's Avatar
 
Join Date: Jun 2012
Posts: 5
pruimtime is on a distinguished road
thanks for the help i have a tj and frustrated me to death
pruimtime is offline   Quote
Old 11-10-2012, 08:38 PM   #21
evs
Jeeper
 
Join Date: Jun 2008
Posts: 35
evs is on a distinguished road
What kind of throttle spray for the IAC?

I have the same problem, low idle and some times it sputters out and dies. Othre times it runs fine. I just went to Advanced Auto Parts and they said they didn't have any spray. I didn't want to get the wrong stuff. Can I just use carb cleaner. I don't want to ruin the IAC or any O2 sensors. I plan on taking it apart and cleaning it. Hopefully that will work.

TIA
evs
evs is offline   Quote
Old 11-10-2012, 08:42 PM   #22
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 42,035
Jerry Bransford is on a distinguished road
Advanced Auto Parts didn't have an aerosol throttle body cleaner? You sure about that? If you couldn't find it, they're either out of stock or you're looking in the wrong section. A sensor-safe aerosol carb cleaner is essentially the same thing if you can't find the aerosol throttle body cleaner.
__________________
When you have a choice, buy American.
Jerry Bransford is offline   Quote
Old 05-23-2016, 08:24 PM   #23
Jeeper
 
Weedab's Avatar
 
Join Date: Aug 2015
Location: Whatcom County, WA
Posts: 18
Weedab is on a distinguished road
Hey guys,
I am experiencing almost the exact same issue '97 Wrangler was having. My '98 Wrangler is idling terribly (jumping between 250-800 RPMs, and also sputters a little bit while stepping on the gas. Any ideas? I am going to clean the IAC as I see that is a common issue.
Thanks!
Weedab is offline   Quote
Old 09-26-2016, 08:11 PM   #24
Newb
 
Join Date: Sep 2016
Location: East Tennessee
Posts: 8
pittstate6 is on a distinguished road
Quote:
Originally Posted by Weedab View Post
Hey guys,
I am experiencing almost the exact same issue '97 Wrangler was having. My '98 Wrangler is idling terribly (jumping between 250-800 RPMs, and also sputters a little bit while stepping on the gas. Any ideas? I am going to clean the IAC as I see that is a common issue.
Thanks!
same. it was actually after I changed my battery which is weird, because it was running fine before. now it completely stalls if the clutch is engaged for more than a few seconds. lose all power. cleaned the throttle body, iac, etc. Didn't help. It threw the TPS code at me so I bought a new TPS sensor, but of course the torx heads on that are stripped.... If that doesn't work Idk what else it could be and may have to take it somewhere.

pittstate6 is offline   Quote
Reply

Thread Tools

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
4.2 carb problems stray YJ Tech Forum 25 10-27-2016 02:16 AM
question for master mechanics about idle? autopc25 TJ Tech Forum 11 01-19-2010 06:52 PM
Erratic idle after start up for a minute when hot or cold? autopc25 TJ Tech Forum 2 01-09-2010 07:25 PM
Idle..Idle..Idle..Idleeedead. carlyj YJ Tech Forum 4 10-26-2009 03:24 PM
Idle speed 06R1Raven01TJ TJ Tech Forum 17 01-18-2009 03:39 AM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 03:05 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner