No spark - JeepForum.com
 
LinkBack Thread Tools
post #1 of 13 Old 03-04-2010, 09:32 PM Thread Starter
ewhitaker75
Registered User
1999 TJ Wrangler 
 
Join Date: Jun 2009
Location: Ellensburg, WA
Posts: 4
No spark

First off, I have a 99 TJ 6cyl. MT that had a dead battery, so I jumped it, ran fine, got back home and shut it off and went to drive again. It started fine and the engine shut off abruptly but still had battery. The engine would spin but not start.

Replaced (so far) plugs, ignition coil, cap and rotor and crankshaft position sensor.

What is left to check? Is it a PCM issue?

Thanks in advance

ewhitaker75 is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 03-04-2010, 09:40 PM
CRAWLING 98
Wheeler
 
CRAWLING 98's Avatar
1998 TJ Wrangler 
 
Join Date: Aug 2007
Location: SanDago
Posts: 2,543
Quote:
Originally Posted by ewhitaker75 View Post
First off, I have a 99 TJ 6cyl. MT that had a dead battery, so I jumped it, ran fine, got back home and shut it off and went to drive again. It started fine and the engine shut off abruptly but still had battery. The engine would spin but not start.

Replaced (so far) plugs, ignition coil, cap and rotor and crankshaft position sensor.

What is left to check? Is it a PCM issue?

Thanks in advance
Have you reset the computer? When you crank the engine do you get any spark at all?
Check all the engine fuses.

Group W Bench
CRAWLING 98 is offline  
post #3 of 13 Old 03-04-2010, 09:41 PM
88blkyj
Registered User
1988 YJ Wrangler 
 
Join Date: Feb 2010
Location: Florida
Posts: 583
is it trying to fire after your letting off cranking?

do the tjs also have the ignition module on the driver side wheel well that is prone to getting wet?
88blkyj is offline  
post #4 of 13 Old 03-05-2010, 06:51 AM Thread Starter
ewhitaker75
Registered User
1999 TJ Wrangler 
 
Join Date: Jun 2009
Location: Ellensburg, WA
Posts: 4
Checked all fuses under the hood. How do you reset the computer? Also swapped the ASD and A/C relays to see if that was bad but no difference
ewhitaker75 is offline  
post #5 of 13 Old 03-05-2010, 07:47 PM
greekboy
Registered User
2003 TJ Wrangler 
 
Join Date: Feb 2010
Location: michigan
Posts: 32
Have you checked the camshaft sensor? Might be worth a try. Also check and see if you have any codes by doing the key sequence.
greekboy is offline  
post #6 of 13 Old 03-05-2010, 08:36 PM
madmechanic
Registered User
2005 LJ Wrangler 
 
Join Date: Apr 2006
Location: middlesex New Jersey
Posts: 52
your tps could be done. they can get stuck in clear flood mode and this can cause a no start condition. but that disables injector pulse. are you sure you have no spark? the ignition module is part of the ecm.
madmechanic is offline  
post #7 of 13 Old 03-12-2010, 02:33 PM Thread Starter
ewhitaker75
Registered User
1999 TJ Wrangler 
 
Join Date: Jun 2009
Location: Ellensburg, WA
Posts: 4
Took it to the shop finally, ended up having a short in the injector wiring that was on the same circuit as the crank position sensor therefore the sensor was bad allowing no spark.
ewhitaker75 is offline  
post #8 of 13 Old 03-26-2010, 04:51 PM
Billyjoebob007
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Denver
Posts: 409
Quote:
Originally Posted by ewhitaker75 View Post
Took it to the shop finally, ended up having a short in the injector wiring that was on the same circuit as the crank position sensor therefore the sensor was bad allowing no spark.
So if the crank sensor is bad there will be no spark coming from the coil ?

I'm trying to work on me roomies 97 , he said he hit a big water puddle and it died on him and now it will only crank and will not kick over. I tried shooting a bit of starting fluid in the air filter and nothing, i even tried pouring a bit of gas into the throttle body and nothing. I went to relieve the fuel pressure one the relief valve on the fuel rail and the gas did not spray out but only a little bit dripped out. I tested the ignition coil and there is not spark from the coil. Sooo, bad coil/crankcase sensor/fuel pump ???? We have let the vehicle sit and dry out for a couple days. Theres no moister inside the dist. cap and none in the air filter box.
Billyjoebob007 is offline  
post #9 of 13 Old 03-26-2010, 04:55 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 64,352
Correct, there will be no spark if there is no output from the crankshaft or camshaft position sensors. Have you tried reseating all the engine's electrical connectors, especially the ignition coil's 12v connector? Rinsing the connectors with WD-40 will get rid of any moisture inside, just shake the excess WD-40 out before reconnecting them.

Getting Savvy...

When you have a choice, buy American.
Jerry Bransford is online now  
post #10 of 13 Old 03-26-2010, 05:16 PM Thread Starter
ewhitaker75
Registered User
1999 TJ Wrangler 
 
Join Date: Jun 2009
Location: Ellensburg, WA
Posts: 4
Sounds like you have a bad fuel pump. Rent a fuel pressure gauge from autozone. Should be around 45-55 psi. Have someone lay under the fuel tank while you turn on the key and you should hear it energize. If it works, I'd check the wiring for a short as well. Good luck
ewhitaker75 is offline  
post #11 of 13 Old 03-26-2010, 10:18 PM
Billyjoebob007
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Denver
Posts: 409
Quote:
Originally Posted by ewhitaker75 View Post
Sounds like you have a bad fuel pump. Rent a fuel pressure gauge from autozone. Should be around 45-55 psi. Have someone lay under the fuel tank while you turn on the key and you should hear it energize. If it works, I'd check the wiring for a short as well. Good luck
Yea i dunno though, I poured a bit of gas into the throttle body while some one was cranking it and it would not even try to kick over. I didn't i hear the pump prime when turning the key on , I will have to have someone turn the key while get back there and listen. I think it may be that crank sensor or the coil though.
Billyjoebob007 is offline  
post #12 of 13 Old 03-26-2010, 10:24 PM
Billyjoebob007
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Denver
Posts: 409
Quote:
Originally Posted by Jerry Bransford View Post
Correct, there will be no spark if there is no output from the crankshaft or camshaft position sensors. Have you tried reseating all the engine's electrical connectors, especially the ignition coil's 12v connector? Rinsing the connectors with WD-40 will get rid of any moisture inside, just shake the excess WD-40 out before reconnecting them.
I tried a few, the connector for the crank sensor/the computer - took all three connectors off and 1 had some kind of fluid in it didnt look like water though, and i cleaned that up good, i did check the connector to the coil and it was secured, i will disconnect it and clean it though. To check trouble codes doing the key on/off trick how many times do you turn the key for that ? I turned it on/off three times then back on and the check engine light didn't do anything.
Billyjoebob007 is offline  
post #13 of 13 Old 03-27-2010, 05:51 PM
Billyjoebob007
Registered User
1997 ZJ 
 
Join Date: Dec 2008
Location: Denver
Posts: 409
Humm ok i found the problem, its the ignition switch and the i think its called the ignition start module, are both bad. who would've thunk it .
Billyjoebob007 is offline  
Reply

Tags
1999 tj , electrical , ignition , spark

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



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
No spark during crank but spark when key released...WTF? USMC_JeepGuy YJ Wrangler Technical Forum 16 08-03-2013 08:00 PM
spark from spark plug! AlaskaJeepMan TJ Wrangler Technical Forum 3 08-20-2010 06:08 AM
No spark on start, one spark on run. Benny88 YJ Wrangler Technical Forum 7 03-05-2010 02:38 PM
no spark gordonsjeep YJ Wrangler Technical Forum 1 01-14-2009 06:24 AM
88 yj 2.5 no spark help snofrog YJ Wrangler Technical Forum 1 01-08-2005 01:25 PM

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