Still no spark from Coil!!! - Off-Road Forums & Discussion Groups
Jeep-Short Wheelbase All discussion of short wheelbase Jeeps: CJ, TJ, YJ and JK

 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 07-06-2002, 01:41 AM
**DONOTDELETE**
Guest
 
Posts: n/a
Still no spark from Coil!!!

Hi all,

As posted earlier, I have an 85 CJ-7 that I put a 401 into. I had it running for a short time, and it suddenly died.
I'vge narrowed the problem down to electrical, but am stumpped. Here's why; I have no spark coming from my coil. I've checked the wires, and even put some jumpers from the batt to the appropriate posts on the coil.
I changed the coil (because I thought it might be bad) and it was still "no go". I did a "Nutter Bypass", and replaced my ignition module. Still "nogo".

The engine turns over fine, but doesn't want to start. The coil isn't producing a spark...

Where do I go from here?

Thanks in advance,
Doc
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 07-06-2002, 07:38 AM
 
Join Date: Jun 2001
Posts: 1,705
Thanks: 0
Thanked 0 Times in 0 Posts
 
Re: Still no spark from Coil!!!

Has it run since you did the Nutter bypass?
AllLockedUp is offline  
post #3 of (permalink) Old 07-06-2002, 09:37 AM
Way Outta Control
 
Join Date: Sep 1999
Location: The Palouse
Posts: 13,432
Thanks: 1
Thanked 3 Times in 3 Posts
 
Re: Still no spark from Coil!!!

1. Do you have a volt meter? If not buy one.
2. Don't put jumpers ANYWHERE unless you know why you're doing this and what the results will, or should be. You can take out circuits doing that! My simple guess is that you may have fried the igniton module by doing this activity.
3. Why did you thing the coil was bad?
4. What did you replace the coil with?
5. Why did you do a Nutter bypass?
6. What wiring directions did you follow?
7. Why did you think if the OEM ignition would not work that the Nutter bypass would cause it to work?
8. Have the new igniton module and coil tested.

Ok, now let's get back to basics.

1. Restore the ignition stystem to stock. Troubleshoot from there. If this system does not work, the Nutter won't work either.
2. Do you have 12 volts at the positive post of the coil in the START position of the ignition switch?
3. Do you have about 8.4 volts at the positive post of the coil in the RUN position of the ignition switch?
4. Does the negative side of the coil go to the igniton module? This provides negative return for the coil. The coil is NOT grounded.
5. If you put a test lamp on the negative side of the coil and crank the engine does the test lamp flash? If it ain't flashing you've got:
a. A bad pick-up in the distributor
b. A bad ignition module or,
c. The distributor is not turning or,
d. A combination of the above.
LEVE is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Off-Road Forums & Discussion Groups 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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome