spit, sputter, pop..........? - 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 11-28-2011, 05:59 PM   #1
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
spit, sputter, pop..........?

I have a 90 2.5 YJ with manual tranny. I went wheeling Sat at Uwharrie, and I was getting aa slight miss every now and then and just ignored it thinking maybe some bad fuel.
Well as I went on wheeling it got worse, and eventually it would do it on every incline, and when it was under any kind of load. It even died a few times. It will idle fine for as long as I will let it, but under a load it starts the sputter/pop.
I am torn between pulling the tank, and replacing the crank position sensor.

__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 11-28-2011, 07:29 PM   #2
Thank you Veterans

5-Year WF Supporting Member
::WF Moderator::
 
Beastmaster's Avatar
 
Join Date: Aug 2011
Location: The Old Pubelo
Posts: 24,761
Has the tank ever been down? In 21 years allot of gunk can build up back there but is easy to clean out once it is opened up. You can even replace the screen in the tank for not too much. It definately sounds like a fuel problem to me, I'd start in the back and work my way forward. The cheapest thing would be to start with your fuel filter, I replace mine annualy.

Beastmaster is offline   Quote Quick Reply
Old 11-28-2011, 11:04 PM   #3
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
I changed the fuel filter 2 weeks ago, and a full tune-up 4 weeks ago.
The crazy thing is that I went out and ran it through the woods tonight, and it is running great. I climbed tree stumps, hills and everything I could to get it to miss and sputter, and it ran fine. I plan to drop the tank and see if I have a ghost in there floating around
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 11-28-2011, 11:26 PM   #4
Jeeper
 
guardian262's Avatar
 
Join Date: Oct 2011
Location: Baltic, CT for the time being.
Posts: 89
Very well could be the mystery floater. If you come up empty on that, might want to try a compression check on all cylinders just to make sure you aren't getting blow-by when under a heavy load.
guardian262 is offline   Quote Quick Reply
Old 11-29-2011, 07:55 PM   #5
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
Quote:
Originally Posted by guardian262 View Post
Very well could be the mystery floater. If you come up empty on that, might want to try a compression check on all cylinders just to make sure you aren't getting blow-by when under a heavy load.
Compression is great, the motor has about 5,000 miles on it since a re-build. I am thinking either trash in the tank or fuel pump.
Is there a fuel pressure regulator on my 90 with a throttle body? I was thinking the injector regulated the pressure
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 11-30-2011, 10:10 PM   #6
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
I am hearing that I may need to get a computer. This is kinda frustrating.........I know that usually a sputter/pop is usually a fuel delivery problem, but can't the crank position sensor do this as well? A computer can to I am told.
Now I can't get it to do it
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 11-30-2011, 11:51 PM   #7
Jeeper
 
guardian262's Avatar
 
Join Date: Oct 2011
Location: Baltic, CT for the time being.
Posts: 89
D5....The CPS can definitely be a culprit and loves to be an intermittent problem. Do you notice it acting up more when it is wet or humid out? Could be a good sign of some exposed wiring. I have had that problem in the past but it was on a newer OBD II vehicle.
guardian262 is offline   Quote Quick Reply
Old 12-04-2011, 02:53 AM   #8
Jeeper
 
Join Date: Dec 2011
Location: Elizabethville
Posts: 16
There is a fuel pressure regulator on. 1990 2.5 TBIs its located on the back side closest to the valve cover below the fuel return line. Looks like a little canister hanging upside down
strykerman is offline   Quote Quick Reply
Old 12-04-2011, 09:10 PM   #9
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
Quote:
Originally Posted by guardian262 View Post
D5....The CPS can definitely be a culprit and loves to be an intermittent problem. Do you notice it acting up more when it is wet or humid out? Could be a good sign of some exposed wiring. I have had that problem in the past but it was on a newer OBD II vehicle.
I haven't been able to drive it much this past week, but as far as I can tell it is not predictable at all.
What I have found is earlier today that when it sputters, I can lift the hood and mess with the CPS plug on the passenger fire wall, and then it will go back to running ok. There seems to be no damage to the plug, and it is not corroded. This may be a fluke, I will have to drive it some more to be sure
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 12-04-2011, 09:11 PM   #10
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
Quote:
Originally Posted by strykerman View Post
There is a fuel pressure regulator on. 1990 2.5 TBIs its located on the back side closest to the valve cover below the fuel return line. Looks like a little canister hanging upside down
Thanx I will also look at that tomorrow
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 12-05-2011, 10:15 PM   #11
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
I changed the crank position sensor tonight. I haven't driven it much yet, but no sputter/pop so far

The old one was very dirty. I am wondering if just a cleaning would have helped?
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 12-05-2011, 10:17 PM   #12
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
Quote:
Originally Posted by strykerman View Post
There is a fuel pressure regulator on. 1990 2.5 TBIs its located on the back side closest to the valve cover below the fuel return line. Looks like a little canister hanging upside down
Btw I didn't see one of those on my Jeep.
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 12-06-2011, 07:41 PM   #13
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
I do believe it is fixed after changing the CPS
I am going to drive it again to the store now and I hope it is fixed. So far so good
__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Old 12-06-2011, 09:34 PM   #14
Jeeper
 
guardian262's Avatar
 
Join Date: Oct 2011
Location: Baltic, CT for the time being.
Posts: 89
Keeping my fingers crossed for you D5. That CPS seems to be my nemesis with every vehicle I own.
guardian262 is offline   Quote Quick Reply
Old 12-07-2011, 10:05 PM   #15
Jeeper
 
DirtyRob's Avatar
 
Join Date: Sep 2011
Location: Sampson County N.C.
Posts: 1,155
Images: 3
Quote:
Originally Posted by guardian262 View Post
Keeping my fingers crossed for you D5. That CPS seems to be my nemesis with every vehicle I own.
Thanx fella. I have owned a lot of Jeeps, but this is the foirst time I have had one with the Crank Sensor going out. I have heard people say they give a lot of trouble.
It runs much better now

__________________
wherever you go there you are..........
DirtyRob is offline   Quote Quick Reply
Reply

Tags
backfire , loss of power , sputter , sputtering

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:
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sputter sputter BigGreen98 TJ General Discussion Forum 17 11-27-2011 05:54 PM
97 Wrangler Sport with sputter. HELP! vaughnt252 General Jeep Discussion 0 07-29-2011 02:32 PM
Help me! Spit and sputter! BlackedOutYJ YJ Tech Forum 9 05-13-2011 11:05 AM
Sputter on Initial Accel in my 2004 4 banger Atthehop TJ Tech Forum 0 09-11-2010 02:04 PM
How can i get my 95' yj to spit a code... Anthony YJ Tech Forum 3 08-28-2010 02:12 AM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 11:23 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