2008 F-150 STX 4x4 with a 4.6L, wiring diagram needed for PCM.
Working on the latest mechanical debacle with my ‘08 F-150. It’s a four wheel drive STX with the two valve 4.6L. I need the wiring diagram for where the harness connectors plug into the PCM. Wanting to check continuity of the control wires for the COPs. The truck shakes like a cylinder is misfiring, but only slightly at idle, and a lot between 1200 and 1400 RPM while driving. I can’t feel anything abnormal at 2000 RPM or above. Code says “coil C primary/secondary”.
The coil tests 5.95 ohms from both the power and the control terminal to the end of the spring. All the plugs are new Motorcraft plugs. The connector is good. The power wire shows 12.1 volts with the switch on. I’ve put a test light on the #3 coil control wire & battery positive with the engine running & the test light blinks, but I was thinking the wire could be partially broken or shorted to power somehow. |
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Have you actually tried swapping coils?
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I haven’t. I’ll swap #3 with #2 & reset the check engine light today. Supposed to leave it with a mechanic this week to have the valve cover gaskets replaced, and I’m going to ask him to check for a vacuum leak while he has it.
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Now I know why it threw a coil C primary code.
Originally Posted by glc
(Post 5273006)
Have you actually tried swapping coils?
https://cimg1.ibsrv.net/gimg/www.f15...3ab3aa76d.jpeg |
Problem solved.
Originally Posted by SiskCFRN
(Post 5273008)
I haven’t. I’ll swap #3 with #2 & reset the check engine light today. Supposed to leave it with a mechanic this week to have the valve cover gaskets replaced, and I’m going to ask him to check for a vacuum leak while he has it.
I’d been driving it in limp mode for a week, and the exhaust had already started making a clanging sound. That went away when I replaced the coil. Thanks for both y’all’s help. |
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