bogging and idling high? - Jeep Wrangler Forum
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 11-22-2009, 10:22 PM   #1
Jeeper
 
koz555's Avatar
 
Join Date: Nov 2009
Location: silverwood, mi
Posts: 89
bogging and idling high?

98 sahara is bogging out and ideling high. is it time for a new fuel filter?

koz555 is offline   Quote Quick Reply
Old 11-23-2009, 01:02 PM   #2
IITYWTMWYBMAB

WF Supporting Member
::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 10,010
Images: 5
Could be, have you tried some fuel injector cleaner yet? I would try that the next two fill ups and see, as it far less expensive. Any check engine lights or codes?

__________________
79.96.85.00.01.97.00.97.93.97.95.94
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
4Jeepn is online now   Quote Quick Reply
Old 11-23-2009, 01:26 PM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,452
Images: 2
I doubt it's a clogged fuel filter. The TJ's fuel filter is positively huge, surface area-wise, and is designed to be a lifetime filter. That you have to drop the gas tank to get to it is a pretty good indication Jeep doesn't think it'll ever need changing.

I would head down to your local auto parts supply store and buy an aerosol can of throttle body cleaner. Then after reading the instructions on the can, remove the air intake tube from your throttle body, start the engine, and then use the entire contents of the can to clean the interior of the throttle body. Keep the engine rpms up a tad as you do this as the engine will bog down as you spray. There is a funny shaped slot inside the throttle body, just above the butterfly valve plate, that provides all of the engine's air at idle. That slot feeds air to the IAC (Idle Air Controller) which meters air through that slot into the throttle body below the butterfly valve plate. Make sure some of the throttle body cleaner gets into that slot as the IAC invariably gets dirty which causes idle problems.

I doubt a fuel injector cleaner will help or do anything at all. Today's gasolines, as opposed to how they used to be, contain sufficient fuel injector cleaners to keep the injectors clean. Out of couriosity, I asked a lot of dealer mechanics (I used to have 20-30 car dealerships as clients) if they had ever seen a clogged/dirty fuel injector in their work. Only the older guys had but not in many years. That "fuel injector cleaning service" dealerships push on their customers is something like 90% profit for a dealership and is really not needed any more. They sell a lot of them though to unsuspecting customers as it adds a lot of profit to any job they do.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 11-24-2009, 06:58 PM   #4
Jeeper
 
koz555's Avatar
 
Join Date: Nov 2009
Location: silverwood, mi
Posts: 89
there are no check engine lights on.. im a new jeep owner. where exactly is the throttle body? i have a k&n air filter .. i was also told it might be a vaccum leak? where should a check the hoses for that also?
THANKS
koz555 is offline   Quote Quick Reply
Old 11-24-2009, 07:59 PM   #5
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,452
Images: 2
The throttle body sits on top of your engine and is what all of the engine's air enters through. The big 3" diameter black air tube that is connected to your air filter box connects to the throttle body at its other end.
Attached Images
 
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 11-24-2009, 08:53 PM   #6
Jeeper
 
koz555's Avatar
 
Join Date: Nov 2009
Location: silverwood, mi
Posts: 89
alright thanks jerry
koz555 is offline   Quote Quick Reply
Old 11-25-2009, 07:39 AM   #7
Jeeper
 
adkjoe's Avatar
 
Join Date: Aug 2009
Location: Northern Vermont
Posts: 1,615
ok I have always done this with the engine off so im curious. When spraying the whole can into the TB you want to get it past the butterfly. So do I just hold the butterfly open a bit so the rmps stay higher and just spray away?
adkjoe is offline   Quote Quick Reply
Old 11-25-2009, 09:25 PM   #8
Jeeper
 
pyro's Avatar
 
Join Date: Nov 2008
Location: Philly
Posts: 539
I have this problem also, But I already cleaned my TB. I changed the TPS and cleaned the TB at that time about a month ago. new air filter done at same time. any other suggestions as to what to try next?
pyro is offline   Quote Quick Reply
Old 11-25-2009, 10:56 PM   #9
Jeeper
 
JimmyJazz's Avatar
 
Join Date: Sep 2009
Posts: 193
I have a question? What is the "normal" idling level for the engine? What do you mean by "high"?
__________________
2000 Jeep Wrangler TJ Sahara Black
Manual Gearbox
JimmyJazz is offline   Quote Quick Reply
Old 11-25-2009, 11:16 PM   #10
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,452
Images: 2
Quote:
Originally Posted by adkjoe View Post
ok I have always done this with the engine off so im curious. When spraying the whole can into the TB you want to get it past the butterfly. So do I just hold the butterfly open a bit so the rmps stay higher and just spray away?
Yep engine running is best for cleaning the intake. I just crack the butterfly and let 'er rip while keeping the rpms up to keep it from bogging down. I do clean the back of the butterfly without the engine running but most of the cleaner is used with the engine running. I also make sure to get some into the passage inlet above the butterfly which helps clean the IAC inlet.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 11-27-2009, 08:47 AM   #11
Jeeper
 
adkjoe's Avatar
 
Join Date: Aug 2009
Location: Northern Vermont
Posts: 1,615
thx Jerry I will do that.

adkjoe is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 06:21 AM.



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