2007 JK no spark at coil on #1 & #4 cylinders - Jeep Garage - Jeep Forum

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Old 01-12-2016, 02:44 PM
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2007 JK no spark at coil on #1 & #4 cylinders

I hope someone can help me. I don't have any spark at the coil on #1 & #4 cylinders. I have replaced the coil, wires and plugs still no spark.
Can someone help?

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  #2  
Old 01-12-2016, 09:12 PM
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Re: 2007 JK no spark at coil on #1 & #4 cylinders

Which engine do you have?
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Old 01-12-2016, 11:09 PM
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Re: 2007 JK no spark at coil on #1 & #4 cylinders

3.8l

---------- Post added at 04:09 AM ---------- Previous post was at 04:08 AM ----------

I was told it is the ECM.
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Old 01-13-2016, 10:07 AM
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Re: 2007 JK no spark at coil on #1 & #4 cylinders

The ECM indeed supplies the ground for the ignition coils, but it would be wise to check the voltage side first. The voltage to the coils is switched via the ASD relay ( auto shut down). When ignition is switched to run, the ASD relay will be powered, but when not started, it will fall off after some seconds. If power is available there, you could measure the ground wire from the coil to the ECM for continuity. If this also is ok, then most probably the ECM is faulty.
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Old 01-13-2016, 11:02 AM
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Re: 2007 JK no spark at coil on #1 & #4 cylinders

I did check both ASD'S and both were fine. Thank you for your reply.
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Old 01-13-2016, 12:47 PM
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Re: 2007 JK no spark at coil on #1 & #4 cylinders

Your jeep has two ASD´s? Eventhough the relay is fine, it doesn´t say that the wiring to the coil is. It would be a pitty to change the ECM to find out that the problem is wiring related. Only by measuring the voltage at the coil you can be sure about that.
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Old 02-13-2016, 03:34 PM
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Re: 2007 JK no spark at coil on #1 & #4 cylinders

It was the ECM. Thanks to all for there input.
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