Codes P0352 and p302, vibration between 35-50?

Tiny
TJ KING
  • MEMBER
  • 2000 FORD EXCURSION
  • 5.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
Rough running especially during acceleration. Check engine light, p0352 stored and p302 pending. Changed cop and spark plug. Just don’t run as smoothly as it should. Unplugged #2 cop and injector and made no difference at idle.
Friday, October 14th, 2022 AT 7:23 PM

1 Reply

Tiny
AL514
  • MECHANIC
  • 4,692 POSTS
Hello, the p0352 is the cause of the cylinder 2 misfire, it sounds like there is no control for the ignition coil. Either the engine computer (ECM) has a bad driver or there is a circuit issue with the coil, I'll post the wiring diagrams so you can check the driver control at the coil. These ignition coil setups are terrible, if a coil shorts out it can easily take out the computer driver for that circuit. On the 2 wires, the red/light green wire is the 12-volt feed and the pink/with white wire is the control wire. You can test the control with a 12v test light.

If you hook the test light to Battery positive and back probe the pink/white wire while running or cranking the test light should have a dim flashing to it. These are Ground side-controlled coils. You might want to erase the codes first before running the test.

But I don't think any vehicle this old will have any type of cylinder deactivation, especially on an ignition coil. Possibly the fuel injector, but not the coil. Since this is a new coil, if you don't have any control at the coil itself, then go to the ECM and check for control there, just in case there is a wiring issue in between the coil and engine computer. If you need a pinout of the ECM, just let us know. Just don't front probe the connector on the ignition coil because it will spread the pins and have bad contact afterwards.
There is a bulk connector in between the ECM and the coil, c101. Diagrams 3 and 4 show pin 40, still the pink/white wire going in and coming out. This is a place to check for control before going to the ECM. A loose pin fitment will cause these issues.

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

https://www.2carpros.com/articles/how-to-check-for-ignition-spark
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Saturday, October 15th, 2022 AT 10:41 AM

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