Runs with the shakes with bank 2 coil only but will shut off when I plug in bank 1 coil pack?

Tiny
HAWKEYE7392
  • MEMBER
  • 1998 FORD F-150
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 132,000 MILES
Fuses/relays okay, replaced fuel pump/filter, cam/crank sensor, got 2 coils, 4 pack ea. New coils, codes said 2 bad coils, fixed, codes came back, now shows 2 bad 02 sensors, o/l, checked/cleaned grounds, battery is okay. Do I need to relearn crank sensor? Will replace coolant temperature sensor next, I hear it's critical for spark/timing? Fuel, spark, compression, timing all good, will run with the shakes with bank 2 coil only but will shut off when I plug in bank 1 coil pack.
Monday, December 25th, 2023 AT 9:20 PM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
The coil packs on these trucks had a problem that would cause the issue you have described. here is how to change it out, also we should run the codes to see which codes are stored.

This guide should help us:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the images (below). Let us know how it goes.

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Tuesday, December 26th, 2023 AT 10:39 AM
Tiny
AL514
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Hello, what scan tool are you using and what exact codes lead you to replace the coil packs? Not everything is good if it only half the cylinders are firing. What's the full list of all the codes you are getting?
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Tuesday, December 26th, 2023 AT 10:42 AM
Tiny
HAWKEYE7392
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P0351, ign coil A primary/secondary circuit
P0352, ign coil B primary/secondary circuit
Fuel Sys 1, OL-fault
cut-off switch, good
new ign switch
new key switch
looked for frayed/broken wires have not seen any
after replacing coil packs, 2 plugs, 2 wires, cleared codes, then codes came back
injectors good
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Tuesday, December 26th, 2023 AT 7:07 PM
Tiny
HAWKEYE7392
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Foxwell NT710.
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Tuesday, December 26th, 2023 AT 7:18 PM
Tiny
AL514
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Okay, so, it's staying in Open Loop on Bank 1. I assume it doesn't run long enough or does your scan tool show only the Fuel System 1 data PID? Some will show Fuel System 2 data PID for the other bank of the engine. Where did you get the coil packs you put on? And what led up to these faults occurring? Did you get both those codes set at the same time to begin with? Also, the 02's are they setting codes now too? They can cause an Open Loop fault like this; I have dealt with that before. One Bank showing a Fuel System fault and stayed in OL while the other Bank was going into closed loop operations.
Sorry for all the questions, I just like to get a little info on how this all started.
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Wednesday, December 27th, 2023 AT 11:23 AM
Tiny
AL514
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  • 4,692 POSTS
Hopefully one of the previous coils didn't short out and burn a coil driver inside the PCM. We can check for that later. You can check the resistance of each coil pack to make sure they are the same.

If they all test the same, the Primary's are the same and the Secondary's are the same, next I would check for continuity from the coil packs harness connector on each outside pin to ground. To see if there is a short to ground through the PCM on any of the coil control wires.

If that checks out ok, unplug the PCM connector and do the same test to check for shorts to ground in the harness between the coil packs and PCM, but with the PCM unplugged, that isolates the fault to the harness only.

https://www.2carpros.com/articles/how-to-use-a-voltmeter
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Wednesday, December 27th, 2023 AT 11:25 AM
Tiny
HAWKEYE7392
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Initially the 2 codes showed up, I replaced 2 coil packs from Ebay, Fuel Sys 1 OL Fault came later, cleared codes but they came back, will run with bank 2 only (cam sensor) but shuts off if I connect bank 1 coil pack, also replaced cam/crank sensors, do I need to re-learn crank sensor?
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Wednesday, December 27th, 2023 AT 5:33 PM
Tiny
HAWKEYE7392
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Bank 1 coil pack links to crank sensor.
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Wednesday, December 27th, 2023 AT 5:34 PM
Tiny
AL514
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I would check the resistance of the coil packs if you bought used ones off of Ebay. These codes are coil circuit codes, the PCM is not detecting either any voltage or current on the coil control wires CD-1 (Ignition Coil A) and CD-2(Ignition Coil B). Start by checking for 12-volt on the middle wire of the coil pack connector, if there's power check the resistance of that coil pack. You can also hook a test light to battery positive and check for control on those 2 outer pins on the coil pack connector while cranking. What happens if you swap the coils, does it start at all?
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Wednesday, December 27th, 2023 AT 6:23 PM
Tiny
HAWKEYE7392
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Update, found issue, bad coil driver in PCM (SIA electronics calls it a transistor) went ahead and told them to replace both, in the mail back from IL.
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Thursday, February 1st, 2024 AT 5:53 PM
Tiny
AL514
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Yeah, these coils that are only 2 wires with a power and control wire will burn out the power Mosfet (transistor) when the coil primary windings short out, it causes too much current to flow through the transistor and burns it out. On any 2 wire coils this is always an issue. I swap out the coil drivers as well since it's about a $3.00 part and only takes a little while to solder a new one in if the circuit board is not too badly burned. Hopefully they didn't charge you too much. I would recommend you get some new coils from Ford (OEM), so this doesn't happen again. There's always a chance with aftermarket or used coils or any sensor for that matter to be faulty.
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Friday, February 2nd, 2024 AT 7:29 AM

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