No spark from my coil

[Mscromer]

After following everything Tom wrote and everything checking out good I took the DME out and opened it up and found something burnt. Going to send it back to F9T and have him fix it and see if he can tell me how this could have happened. Was it something on the new Kroon harness that I need to check before plugging in the repaired DME

Something definitely shorted out on you. That looks like a surface mount resistor, although it's impossible to tell for sure now. Surprised they don't have components labeled in the PCB silk screen. Curious to hear what the Focus 9 guys have to say. Probably safe to say that's part of the ignition circuit.
My bets are on install error, unfortunately, not the harness. Power was on the F9 at some point and a wire was grounded (or powered) inadvertently. No shame in that. We have all been there.

I’m curious if my old KLR could have done it. Hopefully F9T can tell me how this could have happened so I can check it out before plugging in the new repaired DME.

[Tom]

After following everything Tom wrote and everything checking out good I took the DME out and opened it up and found something burnt. Going to send it back to F9T and have him fix it and see if he can tell me how this could have happened. Was it something on the new Kroon harness that I need to check before plugging in the repaired DME

Something definitely shorted out on you. That looks like a surface mount resistor, although it's impossible to tell for sure now. Surprised they don't have components labeled in the PCB silk screen. Curious to hear what the Focus 9 guys have to say. Probably safe to say that's part of the ignition circuit.
My bets are on install error, unfortunately, not the harness. Power was on the F9 at some point and a wire was grounded (or powered) inadvertently. No shame in that. We have all been there.

I’m curious if my old KLR could have done it. Hopefully F9T can tell me how this could have happened so I can check it out before plugging in the new repaired DME.

Can't really think how the KLR could do it, but one thing that's fairly common with a new engine install is that some wire got crushed/grounded somewhere during the install. On a non-porsche, I once had a wire trapped between the block and bell housing. The wire still had continuity, so 'seemed' ok, but it was also grounded, and blowing fuses. That's why I suggested checking to see if either coil wire is grounded with the dme removed....

[danmartinic]

The Factory Manual specifically cautions against applying any power with main ground disconnected

Screen Shot 2026-03-07 at 1.19.06 PM.png (42.41 KiB) Viewed 726 times

One time I did exactly this but it didn't fry my DME.

Perhaps it fried yours

[Mscromer]

Something definitely shorted out on you. That looks like a surface mount resistor, although it's impossible to tell for sure now. Surprised they don't have components labeled in the PCB silk screen. Curious to hear what the Focus 9 guys have to say. Probably safe to say that's part of the ignition circuit.
My bets are on install error, unfortunately, not the harness. Power was on the F9 at some point and a wire was grounded (or powered) inadvertently. No shame in that. We have all been there.

I’m curious if my old KLR could have done it. Hopefully F9T can tell me how this could have happened so I can check it out before plugging in the new repaired DME.

Can't really think how the KLR could do it, but one thing that's fairly common with a new engine install is that some wire got crushed/grounded somewhere during the install. On a non-porsche, I once had a wire trapped between the block and bell housing. The wire still had continuity, so 'seemed' ok, but it was also grounded, and blowing fuses. That's why I suggested checking to see if either coil wire is grounded with the dme removed....

I have been checking everything to ground. This seems weird to me. Maybe you can explain this to me. DME is out and battery is disconnected. Hooked up the multimeter to the ground that is next to the left headlight hooked the other end to the black positive coil wire and I get this ohm reading. When I have this hooked up in the same manner but switch to volts and turn the ignition to the on position it shows more than 12 volts and same reading once the engine is cranking.

[Mscromer]

Just received this email from F9T

The failure in the picture occurs when the ignition coil is being charged continuously until it is over saturated. Since the ignition mode is set to “Turbo”, the ignition driver is under the direct control of the KLR computer. It seems likely the KLR is driving the ignition signal non-stop, but I would need to evaluate the DME to make this determination. Please ship the OBD+ Sport DME to the below address for evaluation and repair.

So I’ll send it off and see what he says.

[danmartinic]

Maybe send the KLR too and ask him to test it?

Very interesting story for sure

PS. After driving a black one over 18 yrs, that white 951 of yours is looking fabulous and fresh! Nice car

[Mscromer]

Man F9T is great. He told me to send the KLR also and he would check it out in his 951. He doesn’t have the ability to repair it but at least I will know if the KLR is ok. I’ll be shipping them out Monday.

[johnb]

In the meantime I would check DME connector pin 32 for voltage and continuity with ground. With the key on, this pin should show battery voltage. The KLR grounds it to charge the coil - when it's grounded, current is flowing through the circuit that's damaged in your DME. It should only be grounded for the normal dwell time - if it's grounded all the time, then current would be flowing all the time. Testing this with the KLR connected and disconnected might shed some light on whether the KLR is the problem, or the wiring harness (my guess would be the wiring harness)

[Mscromer]

In the meantime I would check DME connector pin 32 for voltage and continuity with ground. With the key on, this pin should show battery voltage. The KLR grounds it to charge the coil - when it's grounded, current is flowing through the circuit that's damaged in your DME. It should only be grounded for the normal dwell time - if it's grounded all the time, then current would be flowing all the time. Testing this with the KLR connected and disconnected might shed some light on whether the KLR is the problem, or the wiring harness (my guess would be the wiring harness)

Thanks for the info. I will be checking this.

[Mscromer]

Got my repaired DME back from F9. He suggested I get a new coil so I got the MSD coil he suggested. After installing everything it started right up. Ran it for 30 min at 2000 rpm to break in the new cam. Once that was done I set the idle per the factory manuals. Now at idle it is running a little rough. I’m suspecting a vacuum leak somewhere. But can someone that knows what they are looking at look at this data log. The only thing that stands out to me is the KLR knock count is 63 and the fly wheel rpm errors is 17 thanks.