99 wrangler wont start/stay running - 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 09-03-2010, 06:52 PM   #1
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
99 wrangler wont start/stay running

UGH. still cant fix it. The only code it throws is p0172 system bank 1 too rich. and believe me it is running RICH. the exhaust fumes are wet with black spots out the tailpipe. sometimes it starts, sometimes it just wont turn over at all. then when it does get running.. itll be fine for 1-2 mins idleing and randomly shut off.

the entire exhaust is brand new, cat and 02s are new, fuel pressure is good, tps is good, crankshaft position sensor is good, MAP, spark plugs are good...

anyone!?!

dmw319 is offline   Quote
Old 09-03-2010, 07:02 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 35,704
Images: 2
Try disconnecting the 02 sensor just below the exhaust header from where it is plugged into the harness and see what happens. A bad 02 sensor can cause the engine to run way rich like yours is doing.

__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 09-03-2010, 07:26 PM   #3
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
I just tried unplugging the 1st 02 sensor like you said and it still doesnt start
dmw319 is offline   Quote
Old 09-04-2010, 10:15 AM   #4
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
bump
dmw319 is offline   Quote
Old 09-04-2010, 10:21 AM   #5
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 35,704
Images: 2
Are you getting spark out of the coil that is bolted to the block below the distributor?
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 09-04-2010, 10:23 AM   #6
Jeeper
 
NHrubicon's Avatar
 
Join Date: Jul 2010
Location: New Hampshire
Posts: 844
Images: 1
son just had a terrible time with a comanche he bought, 4.0 engine-couldn't get it to run decent, etc.-was going to start replacing everything and then started to pull the plug wires or something-and found one that was 'in place' but NOT firmly-just enough to let it run 'sometimes' and othertimes it must have moved enough to not fire.
Plugged it firmly back in-engine is running like a full tuneup was done! So...take a deep breath, and start from square one. All 'basics', spark plug wires, ignition wiring, etc.-take each fitting apart or pull it off one by one, look for corrosion, arcing, plug it firmly back in place.
MY wife's cherokee- 94 Grand limited...also just had horrible stumbling and almost dying in idle...mechanic ran all the codes, ended up with corrosion in a 1 year old aluminum distributor cap, and a plug somewhere in the line where he had to pull it apart to plug in a code reader-must have had corrosion. AFter 2 days he couldn't get it to duplicate the problem and figured-simple corrosion in that wiring clip.
NHrubicon is offline   Quote
Old 09-04-2010, 11:16 AM   #7
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
Quote:
Originally Posted by Jerry Bransford View Post
Are you getting spark out of the coil that is bolted to the block below the distributor?

yes. spark is good too.
dmw319 is offline   Quote
Old 09-04-2010, 11:23 AM   #8
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 35,704
Images: 2
Good spark leaving the distributor and all six plugs are getting good spark?
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 09-04-2010, 11:51 AM   #9
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
Quote:
Originally Posted by Jerry Bransford View Post
Good spark leaving the distributor and all six plugs are getting good spark?
yessir.
dmw319 is offline   Quote
Old 09-04-2010, 12:17 PM   #10
Jeeper
 
Rawkon's Avatar
 
Join Date: Apr 2005
Location: fullerton/big bear
Posts: 2,061
Send a message via AIM to Rawkon Send a message via MSN to Rawkon
check to see if your spark plugs are fouled, check to see if you have a bad injector on the cylinders that bank one is on. reset the PCM, if all checks out it wouldnt suprise me if your PCM took a dump. if theres a way you can get one and swap it out for a test that would be ideal
Rawkon is offline   Quote
Old 09-04-2010, 12:39 PM   #11
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
Quote:
Originally Posted by Rawkon View Post
check to see if your spark plugs are fouled, check to see if you have a bad injector on the cylinders that bank one is on. reset the PCM, if all checks out it wouldnt suprise me if your PCM took a dump. if theres a way you can get one and swap it out for a test that would be ideal
how do i test an injector individually? and how do i know which cylinders bank 1 is on?
dmw319 is offline   Quote
Old 09-04-2010, 01:29 PM   #12
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 35,704
Images: 2
You only have bank 1. Bank 1 and bank 2 are terms only used on newer Wranglers with four 02 sensors, yours only has two.
__________________
When you have a choice, buy American.

Jerry Bransford is online now   Quote
Old 09-04-2010, 04:46 PM   #13
Jeeper
 
Join Date: Jul 2010
Location: Raleigh, NC
Posts: 35
ok thanks.

dmw319 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
WANTED--OEM Factory Running Boards for an 07 Wrangler 2 door kevinss2001 Classifieds Archive 0 07-12-2010 09:34 PM
wtb 91 Wrangler Islander pass side running board beachnjeep Classifieds Archive 0 06-24-2010 07:04 PM
1987 Jeep Wrangler Running Issues dj69firebird69 YJ Tech Forum 10 05-17-2009 08:01 AM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 06:45 PM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 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