Hesitation and then dies - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ 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 06-02-2009, 08:45 PM   #1
Jeeper
 
minderbinder3's Avatar
 
Join Date: Apr 2007
Location: East Texas
Posts: 273
Hesitation and then dies

My 91 2.5 cylinder w/175K started hesitating and idling rough. After it gets warm and the RPMs approach about 2500 it starts sputtering and then dies. If it sits a few seconds it will start right up but continue more of the same shortly after. It back-fired the first two times and hasn't since but it "diesels" now a little when it dies. Any suggestions? The plugs and wires are only a couple of months old and they check fine. I was thinking timing chain, but wouldn't that cause more obvious idling problems?

__________________
Respect is earned and Honor is given
2005 LJ 6-speed with 3" Zone & 33" BFG A/T's
minderbinder3 is offline   Quote
Old 06-02-2009, 09:15 PM   #2
Jeeper
 
minderbinder3's Avatar
 
Join Date: Apr 2007
Location: East Texas
Posts: 273
checked codes

By the way...I checked the codes and got a 14 (MAP sensor?0. What and where is the MAP sensor? The code book says that with that code I should be getting a check engine lamp, but I am not.

__________________
Respect is earned and Honor is given
2005 LJ 6-speed with 3" Zone & 33" BFG A/T's
minderbinder3 is offline   Quote
Old 06-02-2009, 09:19 PM   #3
Jeeper
 
Join Date: Apr 2009
Posts: 538
map sensor is the sensor on firewall above valvecover that has a vacum line or two attached to it. make sure you dont have a vacuum leak.
dooder is offline   Quote
Old 06-02-2009, 09:22 PM   #4
Jeeper
 
RednekYJ's Avatar
 
Join Date: Feb 2007
Location: LITH IL
Posts: 1,459
Replace the EGR valve? Sorry, that's my shot in the dark.
RednekYJ is online now   Quote
Old 06-02-2009, 10:14 PM   #5
Jeeper
 
minderbinder3's Avatar
 
Join Date: Apr 2007
Location: East Texas
Posts: 273
I thought vacuum leak at first too but I have checked every connection and everything seems tight. At cold start it idles fine and doesn't start the hesitation until it warms up (about 4-5 minutes into driving).

I have read similar folks issues and they found the crank sensors and MAP sensor to be the fault. Anybody had similar experience that can advise me? Thanks for all your input.
__________________
Respect is earned and Honor is given
2005 LJ 6-speed with 3" Zone & 33" BFG A/T's
minderbinder3 is offline   Quote
Old 06-03-2009, 07:47 PM   #6
Jeeper
 
minderbinder3's Avatar
 
Join Date: Apr 2007
Location: East Texas
Posts: 273
Replace the MAP sensor and it still stalls out when it warms up. I have checked all the vacuum lines and they seem tight without leaks. I put a gauge to the fuel pressure and it stays at 35, so I don't think that it is fuel related. The codes still give me the MAP sensor. I have also noticed the timing chain slapping more, but it could be because I am spending more time listening to the engine. Anybody have any suggestions? Could it be the crank sensor?
__________________
Respect is earned and Honor is given
2005 LJ 6-speed with 3" Zone & 33" BFG A/T's
minderbinder3 is offline   Quote
Old 06-04-2009, 03:14 PM   #7
Jeeper
 
minderbinder3's Avatar
 
Join Date: Apr 2007
Location: East Texas
Posts: 273
Now I have replaced the MAP, coolant temperature, and the crank sensors and still no difference. It is weird that it starts right up, but idles rough after it gets warm. It also studders and when driving and has a noticeable loss of power. Any advice on where to go from here?
__________________
Respect is earned and Honor is given
2005 LJ 6-speed with 3" Zone & 33" BFG A/T's
minderbinder3 is offline   Quote
Old 06-04-2009, 07:39 PM   #8
Jeeper

WF Supporting Member
 
copleydad's Avatar
 
Join Date: Jun 2009
Location: Woburn MA
Posts: 368
Had something similar happen to a Durango. Changed the fuel filter and all was well.

Good luck!
copleydad is offline   Quote
Old 06-04-2009, 09:01 PM   #9
Jeeper
 
minderbinder3's Avatar
 
Join Date: Apr 2007
Location: East Texas
Posts: 273
Fuel filter is new and the fuel pressure stays the same even when it begins studder. Anybody know anything about timing?

__________________
Respect is earned and Honor is given
2005 LJ 6-speed with 3" Zone & 33" BFG A/T's
minderbinder3 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




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 10:29 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