Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: scrw on January 21, 2011, 09:30:42 PM

Title: Duff coil on a 93 XJ, does it give a fault code??
Post by: scrw 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?

Title: Re: Duff coil on a 93 XJ, does it give a fault code??
Post by: Mike Pavelin 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.

Title: Re: Duff coil on a 93 XJ, does it give a fault code??
Post by: scrw 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.

Title: Re: Duff coil on a 93 XJ, does it give a fault code??
Post by: Jonny Jeep 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.

Title: Re: Duff coil on a 93 XJ, does it give a fault code??
Post by: scrw 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