1993 YJ Starting Issue - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > 1993 YJ Starting Issue

TeraFlex Now at Rockridge 4WD! BEST DEALS around!Alloy usa heavy duty ball joint kitsENGO QUADLUX 6" to 54" LED AMBER AND WHITE MULTI

Reply
Unread 06-05-2012, 04:35 PM   #1
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
1993 YJ Starting Issue

Hi Fellow Members,

My son has a '93 YJ that is becoming very hard to get started. I have researched the posts related to the ECU as being the problem, but I'm not sure that's what it is. I don't want to do brain surgery unless absolutely necessary!

Here is a link to a YouTube video showing the issue.


We welcome your feedback and will try to narrow it down to the most likely issue. We will post our results for others having the same issue.

Thanks again for your help!

Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-05-2012, 04:50 PM   #2
superj
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,603
can you write out what the issue is? i cannot watch youtube from work because its blocked. i have an office job so i have lots of time to help diagnose your trouble this evening
__________________
Slow ride, take it easy
superj is offline   Reply With Quote Quick reply to this message
Unread 06-05-2012, 08:53 PM   #3
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
Yeah, no prob!

The facts:

190k
Plugs, wires, dist. cap/rotor all good
Newer battery
Air filter is clean
All fluids maintained and at proper levels
No check engine light/flashing codes
It turns over just fine...doesn't struggle with that, only to get running
Started doing this out of the blue a couple of weeks ago...not cold nor hot out...nice weather
Runs fine once it starts

The problem:
When starting it, it takes 6-8 seconds to start....seems to really struggle when starting, but once started, runs fine.

My thoughts (please correct me if I'm wrong):

That it is not a fuel pump or filter as I believe that would also affect it after it is started
I'm leaning towards the ECU "brain surgery" option.

Maybe it has spring allergies....I don't know lol.

Any feedback is appreciated.
Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-05-2012, 08:58 PM   #4
superj
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2008
Location: corpus christi, texas
Posts: 6,603
i don;t know to much about the ecu deal but i know that some times the check valve in the fuel pump looses its ability to keep pressure and causes some long hard starts for people.

have you put a gauge on your fuel rail to check the pressure when its starting and when its off. i am not 100 percent sure on the amounts but i think i read it should be around 31 when starting and 39 when the vacuum line is removed. then its supposed ot hold pressure for 20 minutes or so when you turn it off.

sorry, mine is carb'd so i am not up on the fuelly numbers
__________________
Slow ride, take it easy
superj is offline   Reply With Quote Quick reply to this message
Unread 06-05-2012, 09:28 PM   #5
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
Hmmm....sounds interesting enough. I haven't done that yet but will give it a good inspection tomorrow to see if there is anything obvious along the fuel line.

If it doesn't hold the vaccuum, would it still run OK once started or would that problem persist?
Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 06:36 AM   #6
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,481
If you are able to check codes the ecu is fine. If you don't get the cel light when you turn the key then the ecu is bad. I can't check codes either but the CEL light is the key. Do you have a CEL when you turn the key?
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 09:15 AM   #7
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
yes it does come on then goes off once started.
Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 09:59 AM   #8
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,481
You dont have the ecu issue then. You need to start with a couple basics. Check your fault codes and post back what you find. You should have 12, 33, and 55
http://www.jeepforum.com/forum/f12/h...codes-1257145/

Does it make any difference cold/warm start?

Check your fuel pressure. 31 psi running, pull the vacuum to the regualtor 39psi, and most important to your start issue the bleed down; shut it off and make sure your pressure stays above 20 psi after 20 minutes.

Clean your IAC and throttlebody:
http://www.jeepforum.com/forum/f12/q...-body-1262267/
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 03:11 PM   #9
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
Ok will do....my parts store doesn't have an OBD1 tester...I'll have to find one to pull the codes.

It does not make a difference cold vs. warm start.
Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 05:43 PM   #10
sentinal02
H2 Recovery Team Member
 
sentinal02's Avatar
1992 YJ Wrangler 
 
Join Date: Feb 2003
Location: New York
Posts: 6,688
Quote:
Originally Posted by Hosejockey61 View Post
Ok will do....my parts store doesn't have an OBD1 tester...I'll have to find one to pull the codes.

It does not make a difference cold vs. warm start.
read the link Que posted, you don't need a code reader in order to check OBD1 codes on the jeep.
__________________
RIP: '88 YJ 2.5L Ax-5 NP231
Posi-Loked. Herculined. Optima yellow top. 1" Shackle, 2" BDS. Cragar 397's Aussie front.

92 YJ 4.0L Ax-15 231
5" springs, 1" shackle 31's or 35's depending on my mood
sentinal02 is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 05:53 PM   #11
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
I'm such a crackhead....didn't even see that! I will look when he gets home. Thanks!
Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 07:06 PM   #12
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
Ok....the only thing that came up with codes is the 55. I didn't get a chance to look at the fuel line today but will report back when I do. Thanks again!
Hosejockey61 is offline   Reply With Quote Quick reply to this message
Unread 06-06-2012, 09:34 PM   #13
HandsOn
Registered User
 
Join Date: Mar 2005
Location: San Jose, CA
Posts: 251
Weak fuel pressure has already been addressed, so what about a weak spark? Is that common perhaps with an older coil, or wiring that's not getting it's full current flow to the ignition? The truck is old enough now that some of those types of things might crop up now and then.
What about a faulty ECT sensor? If the computer thinks the engine is already warmed up, would the leaner mixture that causes make it take longer to start?
And last but not least... What about an ignition switch that's just on the ragged edge of failing in the start mode? Losing power to the ignition during the START process? That might not fly if these rigs still have the jumper wire from the starter relay to the ignition, but if that was no longer used by '93, maybe it's still got merit.

Haven't checked out que's linked thread yet, but thought I'd just throw out the first things that came to mind.
Good luck.

Paul
HandsOn is offline   Reply With Quote Quick reply to this message
Unread 06-07-2012, 04:07 AM   #14
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,481
Super Yj Handson and I are all telling you the same thing about the fuel psr. Do the test and check the bleed down time.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 06-07-2012, 04:40 PM   #15
Hosejockey61
Registered User
2000 TJ Wrangler 
 
Join Date: Sep 2011
Location: Aurora, CO
Posts: 757
Ok....first off, the pressure test/bleed down test. Is the guage something I can get from a parts store? I'm also guessing that I hook it directly up to the valve on the fuel rail? (please excuse my lack of experience in this area!)

Next, I did a visual inspection of the fuel lines and this is what I found. Several hoses have extensive cracking. I don't smell fuel so I don't think they are leaking. Are the cracks bad enough to allow the pressure to seep through and create the problem we're having?

Lastly, so I don't have to figure it out by trial and error, anybody know the fuel line sizes for replacement?





Hosejockey61 is offline   Reply With Quote Quick reply to this message
Reply

Tags
starter , won't start

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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.