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Author Topic: Duff coil on a 93 XJ, does it give a fault code??  (Read 1322 times)

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scrw

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Duff coil on a 93 XJ, does it give a fault code??
« on: January 21, 2011, 09:30:42 PM »
Troubleshooting a non starting 4l, its not the CPS, getting no fault codes, cranking fine but won't start. Have chacked the coil yet but if they do fail will they give an engine fault code?
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Mike Pavelin

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Re: Duff coil on a 93 XJ, does it give a fault code??
« Reply #1 on: January 22, 2011, 09:13:33 AM »
It might if the primary (low tension) side fails. Unplug it and see if it sets a code. They seldom fail on Jeeps.
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scrw

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Re: Duff coil on a 93 XJ, does it give a fault code??
« Reply #2 on: January 22, 2011, 10:33:10 AM »
Okay, If we have the ignition on and earth the low tension side we get no spark. Off to get one from a scrappy to swap out & see, must say it would be the first time I have seen one fail on a jeep.
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Jonny Jeep

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  • Vehicle: TJ 4.0 Sport
  • Year: 1997
Re: Duff coil on a 93 XJ, does it give a fault code??
« Reply #3 on: January 22, 2011, 08:20:00 PM »
Coil packs used on new jeeps will cause codes but not the good old fashioned coils. Measure the resistance between the LT contacts which should be 0.95-1.2 ohms. Measuring between the LT and HT should give in the region of 11,300-15,300 ohms.
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scrw

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Re: Duff coil on a 93 XJ, does it give a fault code??
« Reply #4 on: January 22, 2011, 09:00:53 PM »
Ta, getting 5k ohms on the HT side, we ordered a new coil at lunchtime, arrives monday/tuesday
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