No spark on the driver's side of engine

DON KLINE

MEMBER
2011 FORD MUSTANG
5.0L
V8
2WD
MANUAL
87,520 MILES

Why is my car only firing on the driver's side? I have no fire on the passenger side at all. Checked the plugs and the coils they are fine. Help.

Saturday, October 9th, 2021 AT 2:44 PM

6 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

Just to clarify, are you getting codes on misfire for one side, or have you physically checked for spark?

If you are getting misfire codes for one side, then it could be due to a clogged catalytic converter on that side.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Please let me know little bit more about what you are experiencing and what you have done so far.

Thank you.

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Saturday, October 9th, 2021 AT 3:50 PM

DON KLINE

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4 POSTS

I changed them to the other side, and they worked fine. Unplugged the ones on the passenger side and it didn't change the way the car runs. It doesn't have any fire to them at all.

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Saturday, October 9th, 2021 AT 5:02 PM

DON KLINE

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4 POSTS

It's like it has no electric power going to the coils.

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Saturday, October 9th, 2021 AT 5:17 PM

SQM

MECHANIC
6,383 POSTS

Check the coil connectors (harness). Do you have power there?
Take a look at the wiring schematics below, it is for the coils. As you can see, they have separate ground for each bank.
If you have no power to the coil connectors, then it could a short in that harness.

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