won't start, bad ignition coil? - JeepForum.com
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Unread 01-27-2013, 10:47 AM   #1
hadesjeep
Registered User
1997 TJ Wrangler 
 
Join Date: Jan 2013
Location: waianae, Hawaii
Posts: 14
won't start, bad ignition coil?

I just got a 97 Wrangler 4.0 with auto trans, all stock. And now
It won't start. It seems i have no spark coming from
my ignition coil, i do have power going into the coil, so i figured i
Needed a new coil. I went to Napa and bought one,
Installed it, and still it wouldn't start. I tried sanding all
The grounding points nice and clean and still no spark. Any ideas
What i need to check? The terminals that plugs into the coil
Are clean and making good contact. My battery is pretty
New and i have 15v going into the coil on the + side of the
Coil connector. Also the way I'm checking for spark is
by unplugging the spark plug wire at the distributor cap
sticking a screw driver in the end of it. And holding it close
To a ground point. While the engine is being cranked.
Is there a better way? Please help. Any and all questions and comments
Are appreciated.

Aloha

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Unread 01-27-2013, 03:10 PM   #2
jnicewan
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1995 ZJ 
 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,006
There are still a couple pieces before the cap that could fail and give you no spark. Testing for spark right out of the coil would be where I would start. If you have spark out of the coil then test it at the coil wire going into the center of the dist cap. If you have spark at the coil wire at the cap and not out of the cap its either a bad cap or rotor.

Dist cap, rotor, plug wires could all cause these problems, but I am betting you probably wont see spark coming out of the coil. If you dont see spark coming out of the coil you probably need to test and/or replace the crank sensor.
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Unread 01-27-2013, 03:31 PM   #3
hadesjeep
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1997 TJ Wrangler 
 
Join Date: Jan 2013
Location: waianae, Hawaii
Posts: 14
Where is the crank angle sensor on the this motor? I'm new to this jeep
Thing. Almost all of my experience is with nissans and 90-96 300ZXs
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Unread 01-27-2013, 03:40 PM   #4
jnicewan
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1995 ZJ 
 
Join Date: Dec 2010
Location: Norman, OK
Posts: 2,006
The crankshaft position sensor is mounted on the trans bell housing on the LH/drivers side. Its up toward the top near where the trans mounts to the engine. There is about 6-8" of wiring coming off the sensor and Im not sure on the wrangler but I think the plug leads up near the fire wall on the passenger side, somewhere above the starter beside the rear portion of the cylinder head.
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Unread 01-27-2013, 04:26 PM   #5
hadesjeep
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1997 TJ Wrangler 
 
Join Date: Jan 2013
Location: waianae, Hawaii
Posts: 14
No wonder i couldn't find it i was looking in front.
Thank you I'll check it out when i get home.
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Unread 01-27-2013, 04:29 PM   #6
hadesjeep
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1997 TJ Wrangler 
 
Join Date: Jan 2013
Location: waianae, Hawaii
Posts: 14
Is there a test i can perform on the sensor to know if its bad
Or do i just have to replace it?
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Unread 02-05-2013, 05:33 AM   #7
Jeep4869
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1998 TJ Wrangler 
 
Join Date: Sep 2009
Location: Kokomo, Indiana
Posts: 139
if you have a timing light you can check the coil that way...easy
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