No spark on cylinder five off ignition coil

2007 FORD TAURUS
179,000 MILES • 3.0L • 6 CYL • 2WD • AUTOMATIC
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LEVONHOLLAND
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  • 2 POSTS
Number five on the coil is not sending a signal to fire at all. The previous owner had the issue too. Coil pack has been changed. Plugs have been changed and wires. When swapping wires onto the ignition coil point, same result. Now would the camshaft synchronization cause this or the PCM? I'm at a complete loss and am totally confused.
Feb 12, 2022 at 9:38 AM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

First, when the key is turned to either on or start, all the coils receive power from the PCM power relay. It has to be working or none of the coils would work.

The PCM provides a ground path at specific times for the plugs to receive spark. On this vehicle, cylinders 1 and 5 receive spark at the same time from the same coil pack. For the coil pack ignition system, each coil within a pack fires 2 spark plugs at the same time. The plugs are paired so that as one fires during the compression stroke the other fires during the exhaust stroke. The next time the coil is fired the situation is reversed. So, in theory, if cylinder 1 is getting spark, cylinder 5 should be as well. (See pic 1 below for connector information) Notice on the connector there is only one connection for coils 1 and 5.

Are you having any issues with cylinder 1? When you check for spark at cylinder 5, is there anything there? If you haven't, here is a link showing how to test for spark:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Is the only code you are getting a P0305? Are there any others?

Let me know. Hang in there. We'll figure it out. Also, let me know exactly how things were switched and checked.

Take care,

Joe

See pic below.
Image (Click to enlarge)
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Feb 12, 2022 at 10:32 PM
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LEVONHOLLAND
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That is with the ignition on. Spark on 1 is good. Even when I switch plug wires to coil # 5 there is no spark.
Feb 14, 2022 at 6:34 AM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

I have a feeling the new coil is bad. Is it doing the same thing as the original coil pack? There is one power supply to the coil and one ground path from the PCM. It sounds like an internal issue with the coil.

Let me know.

Joe
Feb 14, 2022 at 2:29 PM