4.0 not getting spark... - 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 03-30-2013, 06:23 PM   #1
Jeeper
 
Join Date: Nov 2012
Posts: 37
4.0 not getting spark...

I'm swapping a 92 4.0 into my cj. I figured y'all might could help me out over here.

I bought the hesco harness that is made for this swap. It calls for a distributor and coil for a 1998-99 4.0


I have a brand new coil. I tested the power coming to it and get 12 volts on both wires coming in. Is that correct?

I get no spark coming from the ignition wires though.
Did I probably just get a bad coil? Any other possible culprits?

Gigemags05 is offline   Quote Quick Reply
Old 03-30-2013, 06:46 PM   #2
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
I just had a simular no spark issue. Turned out to be the pick up coil in the distrib had a bad ground. Isn't one of the wires going into the coil a ground? Maybe I missed something? New to Jeeps, just trying to learn some stuff.

Squirrel 442 is offline   Quote Quick Reply
Old 03-30-2013, 06:59 PM   #3
Jeeper
 
Join Date: Nov 2012
Posts: 37
That's what I thought. That's why I'm confused how its got 12 volts from
Both wires coming in.

Where did you end up finding the ground for the pick up? I'll check mine out.
Gigemags05 is offline   Quote Quick Reply
Old 03-30-2013, 07:20 PM   #4
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
on my rig it was ground to the side of the engine block half way betwween the starter and valve cover.
Squirrel 442 is offline   Quote Quick Reply
Old 03-30-2013, 07:25 PM   #5
Jeeper
 
Join Date: Nov 2012
Posts: 37
Yeah that's what I figured. My Ground there is good.
Gigemags05 is offline   Quote Quick Reply
Old 03-30-2013, 07:42 PM   #6
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
I also replace the crankshaft sensor (CKS) at the bell housing (drivers side top). That will also give you no spark.

Did you put on a new one with the swap? I hear they are easily damaged. They are about $60 in the auto parts store, $16 on amazon and a lot of guys say to use the dodge or Chrysler part (not sure what number).

There is a way to test the CKS. You'll have to google it.
Squirrel 442 is offline   Quote Quick Reply
Old 03-30-2013, 07:51 PM   #7
Jeeper
 
Join Date: Nov 2012
Posts: 37
Yeah I have a brand new crankshaft sensor. I bought the relocation kit from hesco that moves it to the crankshaft pulley.

That very well could be an issue, though. Maybe I have it spaced wrong
Gigemags05 is offline   Quote Quick Reply
Old 03-30-2013, 08:00 PM   #8
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
it is one of the main culprits and it is before the coil in the scheme of things, a double check could not hurt.
Squirrel 442 is offline   Quote Quick Reply
Old 03-30-2013, 08:30 PM   #9
Jeeper
 
Join Date: Nov 2012
Posts: 37
I'll check it out.

I'm also wondering about the neutral safety switch. I spliced the wire from the harness into the current switch. Is that alright to do? I guess I could just ground it and see if it starts.
Gigemags05 is offline   Quote Quick Reply
Old 03-30-2013, 08:42 PM   #10
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
Make sure it is not in gear and has the e-brake on. Turn the ignition on and jump it at the starter. That should bypass the switch, if I remember right. That is how I bypassed the switch on my 442.
Squirrel 442 is offline   Quote Quick Reply
Old 03-30-2013, 08:55 PM   #11
Jeeper
 
Join Date: Nov 2012
Posts: 37
How would I jump it at the starter?
Gigemags05 is offline   Quote Quick Reply
Old 03-30-2013, 09:07 PM   #12
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
they make a push button with alligator clips that connect to pos and neg terminal. Us shade tree guys use a rubber handle screw driver to bridge the pos and neg terminals. don't do it with a metal tool in your hand or she will bite you. Also ensure you're not covered in fuel.

Very easy to do, I am sure there are videos on youtube.
Squirrel 442 is offline   Quote Quick Reply
Old 03-31-2013, 03:18 PM   #13
Jeeper
 
Join Date: Nov 2012
Posts: 37
If it was the nss, though, would it still get power to the coil?
Gigemags05 is offline   Quote Quick Reply
Old 03-31-2013, 07:14 PM   #14
Jeeper
 
Join Date: Nov 2012
Posts: 37
I grounded the neutral safety switch and got the same results.

Beautiful day here and the jeep won't start.
Gigemags05 is offline   Quote Quick Reply
Old 03-31-2013, 08:55 PM   #15
Jeeper
 
Squirrel 442's Avatar
 
Join Date: Mar 2013
Posts: 152
Did you ever find out if one of the coil wires is supposed to be grounded? Try to google it?
Squirrel 442 is offline   Quote Quick Reply
Old 03-31-2013, 10:28 PM   #16
Jeeper
 
Join Date: Nov 2012
Posts: 37
I've tried googling it and haven't come up with anything.

The harness is brand new and both of the wires are part of a dedicated connector, so if one is supposed to be grounded it would mean te harness is messed up, I think.
Gigemags05 is offline   Quote Quick Reply
Old 04-02-2013, 11:32 AM   #17
Jeeper
 
Join Date: Nov 2012
Posts: 37
I checked it with a light last night and now only the green/orange is getting power to the coil, the white was not.

Also, the switched 12 volts is getting power all the way through cranking, so that is good I think.
Gigemags05 is offline   Quote Quick Reply
Old 04-02-2013, 01:28 PM   #18
President, ThumbJeeps

WF Supporting Member
 
sevenservices's Avatar
 
Join Date: Sep 2009
Location: Mid-Michigan/Thumb
Posts: 3,947
Quote:
Originally Posted by Gigemags05 View Post
Yeah that's what I figured. My Ground there is good.
but, is your block grounded to the frame? with the rubber in engine mounts you may want to run a ground strap from the block to the frame depending... If you have a continuity tester (beep setting on voltmeter) then touch one end to the - on the battery and the other end to your block, it should beep.
__________________
-Chris
President, ThumbJeeps
CB Callsign "AirForce One"


1994 Wrangler YJ I6 4.0 H/O Auto 3 spd. 4" RC (33x12.5) (15x8) 3:54 Gears
sevenservices is offline   Quote Quick Reply
Old 04-02-2013, 02:14 PM   #19
Jeeper
 
Join Date: Nov 2012
Posts: 37
My voltage meter doesn't have a beeper.

But I do have a ground running from the block to the firewall, that ribbon looking one.

I also have the block grounded to the negative side of the battery.

Is this wrong?
Gigemags05 is offline   Quote Quick Reply
Old 04-22-2013, 02:04 PM   #20
Newb
 
Join Date: Mar 2010
Posts: 5
What was the issue with not getting power to the distributor?

Thank you sir, in advance.

SGT DELTA is offline   Quote Quick Reply
Reply

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




Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 03:53 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