Cranks but wont start - 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 > Cranks but wont start

FS: Wrangler RGB Multicolor Fog Light LEDs: Awesome EffectFS: Wranger BRIGHT License Plate LED! Just $3! Great valueThanksgiving/Black Friday/Cyber Monday Deals at JeepinOutf

Reply
Unread 02-13-2013, 08:54 PM   #1
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
Problem Solved



Now i cant get th jeep tostart its. 92 4.0
It cranks and wants to start then stops. I also noticed the rpms arent moving.
Would that keepit fromstarting?

Where is thr sensor for thst?

__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-13-2013, 09:52 PM   #2
Mark05059
Registered User
1989 YJ Wrangler 
 
Join Date: Mar 2009
Location: quechee Vermont
Posts: 4,353
turn the key to the on position... dont try and start it.. keep watch for the check engine light (should come on right away and then go out in about 3 seconds) if it does then the computer is good... if it doesnt come on right away.. wait (could be up to 2 minutes) with the key on for the light to come on... you will hear a few clicks etc when the light comes on... then turn it to start..

report back on your findings
__________________
1998 ZJ 5.2 Auto

1989 Wrangler Black Bone Stock 2.5l 5spd
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Mark05059 is offline   Reply With Quote Quick reply to this message
Unread 02-13-2013, 11:00 PM   #3
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
Yes it comes on right away. And i got the rpms to show. But now its running rough and rpms drop to stall. Now im thinking TBS?
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 07:09 AM   #4
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Start with the basics. Check your codes and post back what you find:
http://www.jeepforum.com/forum/f12/h...codes-1257145/
No rpm is a cam(Distributor pickup) or the more likely issue(Since rpm indication comes from the CPS) The crank position sensor.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 07:32 AM   #5
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
thanks i've counted 3 times and every time i've gotten 35 and 76 which arent listed?
I will check readings on Cps
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 08:01 AM   #6
Berniebikes
Registered User
1988 YJ Wrangler 
 
Join Date: May 2010
Location: Williamsburg, VA
Posts: 739
Here ya go. Would first investigate the possible fault for your fuel pump

Code 76-Ballast bypass relay-open or short in fuel pump relay circuit.
Code 35-Radiator fan control relay circuit-open or short detected in teh radiator fan relay circuit.
Berniebikes is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 09:01 AM   #7
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Did you get 12,33, and 55 as well?
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 10:31 AM   #8
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
its an islander so It had A/c

start 12
35
76
end 55
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 11:02 AM   #9
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
No the ac is a different thing. Dont worry about it though. code 76
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 11:05 AM   #10
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Sorry. The codes you are throwing can only be there because the ecu was swapped out at some point. No big deal. It is from an XJ. Back to the issue it sounds like the crank position sensor if you don't see rpm.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 11:08 AM   #11
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
yea, that's looking like the culprit I got no continuity.
I'll report back this afternoon when it comes in.
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 06:14 PM   #12
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
Replaced the cps and got it to run shortly. Ran really rough and the. Stalled out
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 07:59 PM   #13
Que89YJ
Web Wheeler
1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit, Michigan
Posts: 15,608
Did the rpms on the gauge drop out before the stall? I think you are describing a fuel issue but I have a couple things to try. Disconnect the battery for a 10 count. Try and start and run. Next disconnect the temp sensor at the tstat and the O2 sensor. Run it and if it doesn't make a difference shut it down and disconnect the battery. Last and what I really think is bad you need to go rent the pressure gauge from the borrow program at the parts store and see what your fuel rail pressure is. You should see 31 psi. Let it idle until your problem happens.
Que89YJ is offline   Reply With Quote Quick reply to this message
Unread 02-14-2013, 10:29 PM   #14
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
yea that's what I was figuring after all that
I dropped the tank and am putting in clean fuel and grounding the pump to frame.

will keep you posted..
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Unread 02-17-2013, 08:05 AM   #15
robx316
Registered User
1992 YJ Wrangler 
 
Join Date: Jul 2012
Location: , New Jersey
Posts: 61
Quote:
Originally Posted by Que89YJ View Post
Did the rpms on the gauge drop out before the stall? I think you are describing a fuel issue but I have a couple things to try. Disconnect the battery for a 10 count. Try and start and run. Next disconnect the temp sensor at the tstat and the O2 sensor. Run it and if it doesn't make a difference shut it down and disconnect the battery. Last and what I really think is bad you need to go rent the pressure gauge from the borrow program at the parts store and see what your fuel rail pressure is. You should see 31 psi. Let it idle until your problem happens.
Thanks for all the help
turns out the connector on the fuel sending unit was pulling apart.

also the gas looked like snot and I flushed it out and got some fresh gas in there


purring like a kitten now!
__________________
My build thread
http://www.jeepforum.com/forum/f12/prolonged-yj-build-1470550
robx316 is offline   Reply With Quote Quick reply to this message
Reply

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






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.