1991 Jeep YJ Chugging, HELP! - Page 2 - JeepForum.com
Reply
 
LinkBack Thread Tools
post #16 of 28 Old 08-07-2014, 10:03 PM Thread Starter
cgh498
Registered User
1991 YJ Wrangler 
 
Join Date: Aug 2014
Location: Galveston
Posts: 9
I doubt it would be the fuel pump because I'm able to accelerate quickly now without much struggle. I believe it is sensor related because when it does bog down and stop, when idleing the rpm's range from 500-1500 without touching the pedal.(it moves around on its own)

Also it isn't my cat because right before the cat there is a rust hole so if exhaust needed to, it could exit through there.

Im going to take a look at, clean, and if needed replace the CPS next.

cgh498 is offline  
Sponsored Links
Advertisement
 
post #17 of 28 Old 08-08-2014, 04:42 AM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 24,647
It could be your cat.

Fault codes:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mean Max pics of everything:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

How to use Google to search the forum:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

No Start:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Que89YJ is offline  
post #18 of 28 Old 08-08-2014, 01:10 PM
tjhall
Registered User
 
Join Date: Aug 2014
Location: Galveston
Posts: 1
I'm working with the OP on this issue and will add an update since he is at work. We replaced the crankshaft sensor to no avail. I went back and checked the fuel pressure again, this time while driving around. When the yj started to stumble the pressure dropped from 30 to 15 psi. let me restate that, I would drive and I'll be at 30 psi and slowly start to drop. Once the pressure got under 20 is when the car started having issues.we already replaced the fuel filter, so does this look like the fuel pump is at fault?
tjhall is offline  
 
post #19 of 28 Old 08-08-2014, 03:59 PM
tommy12241
Registered User
1988 YJ Wrangler 
 
Join Date: Dec 2012
Posts: 97
Yes. Definitely the pump
tommy12241 is offline  
post #20 of 28 Old 08-08-2014, 05:25 PM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 24,647
Fuel pump.

Fault codes:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mean Max pics of everything:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

How to use Google to search the forum:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

No Start:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Que89YJ is offline  
post #21 of 28 Old 08-08-2014, 08:18 PM
Delawdude
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2014
Posts: 389
Couldn't be the fuel pressure regulator? Agree it sounds like the pump is not pushing the fuel fast enough to keep up with demand. But not im sure if the FPR could cause similar symptoms?
Delawdude is offline  
post #22 of 28 Old 08-08-2014, 08:20 PM
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
Posts: 24,647
The regulator will always fail high. The diaphragm rips and you see source pressure at the rail.

Fault codes:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mean Max pics of everything:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

How to use Google to search the forum:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

No Start:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Que89YJ is offline  
post #23 of 28 Old 08-09-2014, 01:23 PM
tommy12241
Registered User
1988 YJ Wrangler 
 
Join Date: Dec 2012
Posts: 97
Quote:
Originally Posted by Que89YJ
The regulator will always fail high. The diaphragm rips and you see source pressure at the rail.
I agree. High fuel pressure is generally the sign of a bad regulator. (I say generally because there are no absolutes). But ive never seen a bad regulator create low pressure
tommy12241 is offline  
post #24 of 28 Old 08-09-2014, 01:27 PM
Delawdude
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2014
Posts: 389
Makes sense. Was curious so thought I'd put it out there.
Delawdude is offline  
post #25 of 28 Old 08-09-2014, 06:29 PM Thread Starter
cgh498
Registered User
1991 YJ Wrangler 
 
Join Date: Aug 2014
Location: Galveston
Posts: 9
Solution: I replaced the fuel pump, fuel strainer, and the fuel filter. The fuel filter just needed replaced because of regular buildup, and the fuel pump had little to no output power. Also the fuel strainer had metal shavings inside from the the broken down fuel pump.

Thank you so much for everyone's quick and helpful input
cgh498 is offline  
post #26 of 28 Old 08-09-2014, 07:26 PM
tommy12241
Registered User
1988 YJ Wrangler 
 
Join Date: Dec 2012
Posts: 97
No problem. Glad we could help a fellow jeeper in need
tommy12241 is offline  
post #27 of 28 Old 08-09-2014, 09:04 PM
Delawdude
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2014
Posts: 389
Thanks for posting the fix!
Delawdude is offline  
post #28 of 28 Old 08-11-2014, 06:38 AM
mike134
Registered User
1989 YJ Wrangler 
 
Join Date: Aug 2014
Location: Cleveland
Posts: 5,927
Awesome! Thanks for updating with symptoms and solution!
mike134 is offline  
Reply

Tags
1991 yj , 2.5 liter , 4 cylinder , jeep yj

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

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.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome