HELP! NO SPARK GOING INTO IGNITION COIL what could it be?! - Page 3 - JeepForum.com

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post #31 of 45 Old 03-09-2013, 10:31 AM Thread Starter
DAjeep88
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Quote:
Originally Posted by vadslram View Post
But there are spliced wires at the solenoid? Like I said our rigs have a long and storied past when it comes to POs.
I scanned in the ignition schematic and some trouble shooting pages from my factory manual.
Try these.
http://home.mindspring.com/~dave.mcd...20ignition.pdf
Thank you! You went above and beyond! Im going to trouble shoot it today...one more question are there any fuses that I have to worry about?

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post #32 of 45 Old 03-09-2013, 11:16 AM
vadslram
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Garage
I don't believe so.
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post #33 of 45 Old 03-09-2013, 12:47 PM
Que89YJ
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Fuseable links on the firewall starter solinoid.
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post #34 of 45 Old 03-09-2013, 01:34 PM Thread Starter
DAjeep88
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Are they the black and red square box fuses on the passanger side of the firewall?
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post #35 of 45 Old 03-09-2013, 04:16 PM Thread Starter
DAjeep88
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Alright guys so I connected the ignition coil straight to the battery and the jeep started so I know my ignition coil is good so where is my problem! ????
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post #36 of 45 Old 03-09-2013, 06:02 PM
Old4X
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Power lead from ICM to coil. Goes to relay under battery, then to coil IIRC. Check your wiring diagram

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #37 of 45 Old 03-09-2013, 06:17 PM
Que89YJ
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It comes off the resistive write from the alternator. In my post I ask for 2 measurements.
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post #38 of 45 Old 03-09-2013, 07:26 PM
Old4X
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http://home.sprynet.com/~dale02/wire-big.png Your hot lead has 2 power sources, one straight battery voltage in "start" and the other via the resistor wire shown in red.

Are you using this wiring diagram?

No part of my ignition circuit has anything to do with the alternator.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #39 of 45 Old 03-10-2013, 08:42 PM Thread Starter
DAjeep88
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Yes I am so what do you think went bad?
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post #40 of 45 Old 03-11-2013, 04:32 AM
Old4X
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Take your multimeter and check the white wire at the ICM with key in start condition.

Check red wire at ICM in run condition. DO NOT leave in run position with engine off for more than a few seconds, else you will burn up your ICM.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #41 of 45 Old 03-11-2013, 09:25 AM
psyco31
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i had a similar issue like this when i put a 4.0L form a 99 XJ into my 89 YJ. i spent three days trying to trouble shoot everything. come to find out it was a mini fuse in the fuse box under the hood that shuts off the ingnition system if it was blown. I learned real quick check every fuse no matter what it was for. I don't know on the 88 if you have a fuse that may do the same thing. Soinds so simple, but i tried everything you have been trying before i figured that out.
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post #42 of 45 Old 03-11-2013, 09:56 AM
Old4X
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Also, do not run straight battery power to coil for very long. Yes, it will run, but the resistor in the normal wiring is to keep from frying your coil.

The start circuit uses full battery voltage to coil, then switches to power through the ballast resistor in run (drops voltage to 8 volts or so).

There are ignition mods that do allow full voltage to coil, as more modern ICMs are internally regulated. I have this setup using a GM ICM from a Chevy V-8.

418 miles on 19 gallons of gas. Can't beat the BBD !
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post #43 of 45 Old 03-11-2013, 10:40 AM
Que89YJ
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DA when you start the jeep it has a path that gives it 12 vdc. When you release the starter it is switched through the resisve wire and drops down the coil voltage to about 8 vdc. In the link is the service manual. Use the 1990 trouble shooting step by step starting at page 117.
http://www.jeepforum.com/forum/f12/c...block-1400388/
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post #44 of 45 Old 03-16-2013, 01:58 PM Thread Starter
DAjeep88
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So guys thanks for all the help it ended up being my starter relay it was 40 bucks and she started right up!
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post #45 of 45 Old 03-16-2013, 02:34 PM
Que89YJ
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Did you use the procedure in the fsm?
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help needed , ignition , ignition coil , no spark

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