i'm lost...

[shawn slipetz]

2005, 5.4 litre 3v. replaced throttle body assembly. mass air flow sensor. fuel filter. fuel pump drive module. the fuel pump was done about 4 years ago. the crank sensor and both cam sensors were replace, as well as, all plugs amd coil packs 2 months. the water pump and pully's, belt replaced 6 weeks ago. the motor never threw any codes. driving along, just died. what codes are coming up now are, coil A, primary control circuit/open, p0351. coil F, primary control curcuit/open, p0356. any help in this mater would be greatly helpful and truly appreciated. thank you in advance. Shawn

 

[Hamfisted]

Do you still have your old coils ? You can swap the old (known working...) coils back into cylinders 1 & 6 and see if that cures it. ( If you don't have them, try swapping coils around and see if the code moves with the coils...) Also inspect the coil harness and plug to those cylinders for any damage.

 

[GAINMOB]

what brand of plugs and coils did you use?

 

[JamaicaJoe]

Please tell me if it was those cheap colorful COP from China with German copper wire!

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[shawn slipetz]

Do you still have your old coils ? You can swap the old (known working...) coils back into cylinders 1 & 6 and see if that cures it. ( If you don't have them, try swapping coils around and see if the code moves with the coils...) Also inspect the coil harness and plug to those cylinders for any damage.

unfortunately, i dont have any of the old coils. thank you for the advice. im going to try what you suggested

 

[shawn slipetz]

Please tell me if it was those cheap colorful COP from China with German copper wire!

Sent from my SM-T350 using Tapatalk

champion spark plugs and ngk coil packs

 

[shawn slipetz]

Please tell me if it was those cheap colorful COP from China with German copper wire!

Sent from my SM-T350 using Tapatalk

champion spark plugs and ngk coil packs

 

[shawn slipetz]

Do you still have your old coils ? You can swap the old (known working...) coils back into cylinders 1 & 6 and see if that cures it. ( If you don't have them, try swapping coils around and see if the code moves with the coils...) Also inspect the coil harness and plug to those cylinders for any damage.

Well, I tried what you suggested. switched coils around. Drives good. Then rough again. Reread codes. Still the same. Number 1 & 6 issues. Changed the spark plugs. Drives well. Now rough again. Reread codes once again. Same codes for 1 & 6. I’m truly baffled.

 

[Trainmaster]

Now it's time to check the wiring and connectors to those coils and on the computer. Look for burned or crimped insulation or corroded connectors.

 

[Hamfisted]

Yes, like Train said. Look at the connection plugs and the harness to those coils for damage or breaks. You cleared the old codes when you swapped the coils around right ? And they came back? Do you feel the plug in connections click into a locked position when you plug the coils in ? Check the pins in the coil harness plugs too. If you have access to a noid test kit you can plug a noid into the coil plug and check for steady pulse pretty easy. A test light will sometimes work too. This is just to check for correct signal to the coil from the PCM.

https://www.amazon.com/Astro-7898-D...t&qid=1612584576&sprefix=noid+,aps,292&sr=8-3

 

[shawn slipetz]

Yes, like Train said. Look at the connection plugs and the harness to those coils for damage or breaks. You cleared the old codes when you swapped the coils around right ? And they came back? Do you feel the plug in connections click into a locked position when you plug the coils in ? Check the pins in the coil harness plugs too.

thank you for your input. the connectors click in the coil packs with ease. the wiring looks good. the computer and connections are in good shape and dry. one mechanic suggests that the injectors on 1 and 6 are not working right. said if i was to replace those that my problem would go away. does that make any sense? would a faulty injector cause a coil pack to misfire? i do appreciate any help and advice from everyone. thank you from canada. shawn.

 

[Hamfisted]

You would probably see some additional codes if the injectors were faulting ( like P0261 & P0266 ...). But right now it looks like the PCM is just seeing those faults in those two coil circuits. Watch that video I posted earlier and run through those tests if you can. But you can move the injectors around just like you can the coils, just to satisfy that test. See if the trouble code follows the injectors or not.

 

[shawn slipetz]

Thank you Hamfisted. I watched that video and it gave a lot of info I found helpful. So far I have even replaced those two injectors. Same issues. I can say this, when the old girl is running right, she sounds nice and strong. When she has the shimmering issue, sucks. Have a funny feeling that it’s electrical. She was running rough when I had my head under the hood. All I did was touch one wire, smoothed out. I’m going to replace the two plugs that go to the coil packs, then go from there. Thank you everyone that’s helped with this issue. When I find the problem, I make sure to share what I find.

 

[TJ Hessmon]

coil A, primary control circuit/open, p0351.
coil F, primary control curcuit/open, p0356.

A circuit Open condition is what you are searching for.
A circuit Closed condition would be one that is functioning.

circuit open in cylinders 1&6, those are the foreword most cylinders from the firewall, and opposite each other.
Its time to get out you volt meter and verify those circuits, according to the manual, and verify the injectors as well.

Injectors operate off of pulse width modulation (square waves relative to time) on for 2sec off for 8 sec, then repeat... as an example.
With increased air comes the need to increase fuel, so the injectors stay on longer during intake. That is the simple answer to understanding injection cycling. You can use this to diagnose your failure.

injector pulse width is controlled by the ECU, and transmitted through the wire harness to the injector. Using the wire diagram and your volt meter, you can unplug the harness at the ECU, and the injector, and check each wire to discover where the open circuit is occurring.