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Willybill
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Nov 26, 2009, 6:16 PM
Post #1 of 7
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1999,Jeep Cherokee, 4.0,101,556 miles. This jeep quit while driving down the road. It has no spark. The motor turns over, the fuel pump works as well as everything else. I have changed the Pickup coil,distributor cap, rotor, and crankshaft position sensor. I have the ignition coil off to test, but the book I have says the primary terminals that one is + and the other is -, and the book shows that they are marked. They are not!! I turned the ignition to the run position to see if there was power to tell which was + and -, but no power there. Should there be power at the primary feed wire to the coil?? Reading some of the old Posts, could it be the Ignition control module ??
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 26, 2009, 7:39 PM
Post #2 of 7
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Re: 99 Jeep no spark
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The power only lasts for 2 seconds or until it sees a cranking signal so you need two people to test it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Willybill
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Nov 29, 2009, 2:28 PM
Post #3 of 7
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Re: 99 Jeep no spark
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Thanks, Hammer Time, I finally had time to work on the Jeep, today. There is power to the wire that goes to the coil. I had my wife crank the Jeep also and the test light stayed on while cranking. I had the coil off and it tested with a Resistance meter: + lead to + primary terminal and - lead to - primary terminal @ 200M showed 00.0 / same test but @ 2K showed .004. Then + test lead + primary terminal and - lead to high voltage terminal @ 200K showed 12.5. I assume it is the same as an ohmmeter. Does that mean the coil is bad? My book says if the high voltage terminal test indicates infinite resistance to replace it. 200K it indicates 12.5 and at 20M setting indicates 0.01.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 29, 2009, 2:45 PM
Post #4 of 7
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Re: 99 Jeep no spark
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I can't make heads or tails of what your saying there.
The primary resistance is measured between the + and the - terminals
The secondary resistance is measures from either the + or the - to the coil wire tower.
Also, there are 2 different coil types with different specs
Here they are
Coil Manufacturer
Diamond
Primary Resistance 0.97 - 1.18 ohms at 21 - 27 deg C
Secondary Resistance 11300 - 15300 ohms at 21 - 27 deg C
Toyodenso
Primary Resistance 0.95 - 1.20 ohms at 21-27 deg C
Secondary Resistance 11300 - 13300 ohms at 21 - 27 deg C
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Nov 29, 2009, 2:46 PM)
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Willybill
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Dec 1, 2009, 6:26 PM
Post #5 of 7
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Re: 99 Jeep no spark
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Well, I have a Electro-Tek digital multimeter. It has 6 settings for resistance, 200, 2K,20K,200K, 2M, & 20M. For low resistance I used 2K and for high resistance I used 200K or 20M. When I spoke of high voltage terminal I guess I was talking about the secondary resistance coil tower. I hope that explains things. From the specs you posted It looks like I need a new coil. Thanks, I'll let you know if that takes care of my problem.
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 1, 2009, 6:33 PM
Post #6 of 7
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Re: 99 Jeep no spark
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You would read the primary on the 200 scale and the secondary on the 20K scale.
If the coil doesn't read within those ranges, the coil would be bad anyway.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Willybill
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Dec 13, 2009, 1:11 PM
Post #7 of 7
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Re: 99 Jeep no spark
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Thanks for the help Hammer Time, I replaced the ignition coil and as soon as I added some new gas it started right up. I figured the gas would be bad as it had sat for a couple of months.
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