Long crank, no faults

[Adrien]

Seems I’ve arrived at coils as well! Currently stuck at a gas station lol. long crank, started, then died, checked codes and:

P0351-13 - Ignition coil A primary/secondary circuit
P0352-13 - Ignition coil B primary/secondary circuit
P0353-13 - Ignition coil C primary/secondary circuit
P0354-13 - Ignition coil D primary/secondary circuit
P0355-13 - Ignition coil E primary/secondary circuit
P0356-13 - Ignition coil F primary/secondary circuit
P0357-13 - Ignition coil G primary/secondary circuit
P0358-13 - Ignition coil H primary/secondary circuit

Interesting that all my coils seemed to have failed at once, almost immediately after I turned my headlights on.

Not sure where to start with this one

 

[greiswig]

Seems I’ve arrived at coils as well! Currently stuck at a gas station lol. long crank, started, then died, checked codes and:

P0351-13 - Ignition coil A primary/secondary circuit
P0352-13 - Ignition coil B primary/secondary circuit
P0353-13 - Ignition coil C primary/secondary circuit
P0354-13 - Ignition coil D primary/secondary circuit
P0355-13 - Ignition coil E primary/secondary circuit
P0356-13 - Ignition coil F primary/secondary circuit
P0357-13 - Ignition coil G primary/secondary circuit
P0358-13 - Ignition coil H primary/secondary circuit

Interesting that all my coils seemed to have failed at once, almost immediately after I turned my headlights on.

Not sure where to start with this one

Sorry you're running into this and stuck. If I were guessing, that set of codes looks like something upstream of the coils, not the coils. As you point out…all of them falling at once?

Headlights might be another clue that the voltages are too low. Check battery, charging, etc.

 

[Jimmy Brooks]

Definitely try a new plug for this test, too. I've seen plugs fail internally in some odd, temperature-sensitive ways.

Ok just ordered a plug as well.

 

[Adrien]

Sorry you're running into this and stuck. If I were guessing, that set of codes looks like something upstream of the coils, not the coils. As you point out…all of them falling at once?

Headlights might be another clue that the voltages are too low. Check battery, charging, etc.

Battery was swapped a couple times, charging is the odd one, in hot weather the charging profile commands lower charging voltages which I think made this issue worse.

My best guess at the moment is there’s an issue like you said upstream of the coils that is causing that circuit to require more power than usual. A small short or maybe a damaged ground could possibly explain this. These are my pre-coffee thoughts of the day though so take them lightly. I will get caffeinated, and begin meticulously testing the culprit circuits this afternoon.

Thank you all!

 

[Adrien]

Ok, just pulled a plug and cranked the engine with the plug grounded to the body and I can confirm I’m getting low spark (hear the plug clicking but can’t see spark) and I can also smell fuel coming from the open cylinder so I know fuel is getting into there. So now my question is where from here? I know it’s not ECU because I’ve had a junk yard ECU put into the car and no difference. So the car runs fine, just doesn’t like starting and doesn’t make a difference when boosted with a jumper pack. Plugs were replaced last year and coils are still original. Would it be an engine wiring harness issue?? Maybe coils?

Here is the ground for the ECM (C3557L), others have reported it should be checked frequently, I'll check mine tomorrow when I have access to the car again but in case you're bored it's probably smart to check and clean this ground anyways. The coils have their own ground on the engine but this one might be worth looking at

 

[Jimmy Brooks]

Here is the ground for the ECM (C3557L), others have reported it should be checked frequently, I'll check mine tomorrow when I have access to the car again but in case you're bored it's probably smart to check and clean this ground anyways. The coils have their own ground on the engine but this one might be worth looking at

View attachment 23515

Where do the coils get grounded? I have leaky valve covers and a leaky passenger side upper timing cover and I’m wondering if this could mess with the coil grounds at all.

 

[Adrien]

Where do the coils get grounded? I have leaky valve covers and a leaky passenger side upper timing cover and I’m wondering if this could mess with the coil grounds at all.

See C3555, left and right banks appear to have their own grounds, mirrored on each side. I'm still trying to track down the main engine grounds as well. On other vehicles it usually looks like a metal belt but for the life of me can't find it on this engine.

 

[Adrien]

Located Ground/earth strap, same cable that grounds alternator directly. It's also located in the wheel well but forward (the image attached is from a weird perspective so it's hard to tell at first).

 

[Adrien]

While viewing live data from my scan tool, while cranking ignition coil output shows as "OFF". Is this normal during cranking? Unfortunately since it won't start now I can't see if it changes to "ON" while running

 

[Jimmy Brooks]

While viewing live data from my scan tool, while cranking ignition coil output shows as "OFF". Is this normal during cranking? Unfortunately since it won't start now I can't see if it changes to "ON" while running

I’ll check this, also I’m a noob when it comes to electronics, how would I check the grounds and know if they are functioning properly, I read a forum a while back with someone that owned an LR2 that had a bad starter ground but the ground looked good but something with the amps not meeting factory standards and he replaced it with a higher amp cable and it fixed the issue.