P0354 cant find bad coil

JHNSNBRDLY

MEMBER
FORD F-150

F150 ford 1999 180000ml 5.4L the code i got from the diagnostic is P0354 but i dont know which ignition coil is D. my truck is misfiring mosty when i put it in drive and i would like to know if it is the coil or something else. the code said P0354 ignition coil D primary/sencondary circuit malfuntion thank you

Thursday, June 28th, 2007 AT 2:04 PM

3 Replies

98RANGERXLT

MECHANIC
301 POSTS

Your engine has whats called coil on plugs for every spark plug there is a coil. Here is a guide to help you find the coil that is not working

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

Please run down this guide and report back.

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+1

Thursday, June 28th, 2007 AT 8:02 PM

BRADTLEW

MEMBER
2 POSTS
1999 FORD F-150
V8
4WD
AUTOMATIC
80,000 MILES

I've had a similar problem as many people with the misfiring of a cylinder, when I pull the code, PO354, coil D malfunction, how does this correlate to the cylinder number? I have yet to find anything, on the internet anyways, showing me COP wiring diagram.

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Wednesday, April 3rd, 2019 AT 12:29 PM (Merged)

BRADTLEW

MEMBER
2 POSTS

Apparently the code reader I have does in fact just list cyclinders 1-8 as A-H, so D, cylinder 4, had a bad coild pack and fouled plug. Replaced and works fine now.

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Wednesday, April 3rd, 2019 AT 12:29 PM (Merged)