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I had a code that cylinder one the ignition coil was bad

Tiny
BUDDYVEGA
  • MEMBER
  • 1999 FORD F-250
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 208,000 MILES
I went ahead and replaced the spark plug and ignition coil, but it still sounds like it is misfiring.
Thursday, December 12th, 2019 AT 11:50 AM

12 Replies

Tiny
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  • 7 POSTS
I have also disconnected the plug and turned on the truck and it still makes the same loud noise as if it was plugged in. I assume it’s the ignition coil module but I just wanted to be sure.
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Thursday, December 12th, 2019 AT 12:01 PM
Tiny
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Good afternoon,

What was the code?

Can you upload a video of the noise you are describing?

Roy
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Thursday, December 12th, 2019 AT 3:01 PM
Tiny
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Hello!

It was a P0351 and P1405.
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Thursday, December 12th, 2019 AT 3:17 PM
Tiny
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Okay, 1405 is for the DPFE sensor. It could be the hose is off or broken. I attached a picture for you.

The 351 is a wiring issue for the coil. I attached a wiring diagram and highlighted the wires. One wire should have 12 volts with the key on. The other wire is pulsed to ground from a signal from the crank sensor.

Roy
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Thursday, December 12th, 2019 AT 3:30 PM
Tiny
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Would it be best to change the whole module to that coil?
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Thursday, December 12th, 2019 AT 3:35 PM
Tiny
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There is no module. The control is the PCM. Check the voltage to the coil first.

What about the noise? Can you upload a video for me?

Roy
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Thursday, December 12th, 2019 AT 3:43 PM
Tiny
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I speaking about the specific connecter to the coil. I’m not at my vehicle right now so I am unable but it is very similar to the sound of a bad spark plug/coil.
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Thursday, December 12th, 2019 AT 3:54 PM
Tiny
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Yes, check the voltage at the coil on number 1.

Roy
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Thursday, December 12th, 2019 AT 3:59 PM
Tiny
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With a multimeter, correct?
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Thursday, December 12th, 2019 AT 5:11 PM
Tiny
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Correct. Check for DC voltage.

Roy
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Thursday, December 12th, 2019 AT 5:23 PM
Tiny
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Thank you so much for your help!
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Thursday, December 12th, 2019 AT 5:31 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Thursday, December 12th, 2019 AT 8:07 PM

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