Carpokes Porsche Forum

BTW - the ground signal from the ECU is quite short - hard to measure on anything but a scope

BTW - plan B is to let your buddy hold the spark plug and you can judge the signal strentgh by how loud he screams at you.

chris white wrote: Wed Apr 16, 2025 7:49 am BTW - plan B is to let your buddy hold the spark plug and you can judge the signal strentgh by how loud he screams at you.

Here are my ignition settings in case anything jumps out.

As far as I can tell everything is registering correctly. I’m seeing good RPM, IAT, CLT, trigger sensors.

That "output voltage" setting of 5V seems like a good place to look, 944 coil needs 12V. This also could explain the dim test light.

Post a screen shot of the other options in the output voltage drop-down menu.

chris white wrote: Wed Apr 16, 2025 7:49 am BTW - plan B is to let your buddy hold the spark plug and you can judge the signal strentgh by how loud he screams at you.

This is the way

cda951 wrote: Wed Apr 16, 2025 6:41 pm That "output voltage" setting of 5V seems like a good place to look, 944 coil needs 12V. This also could explain the dim test light.

Post a screen shot of the other options in the output voltage drop-down menu.

is the ECU powering the coil? the 5v setting seems odd - you mentioned that you were reading 12v at the coil.
Not sure what the 5v setting means?!

chris white wrote: Thu Apr 17, 2025 8:01 am

cda951 wrote: Wed Apr 16, 2025 6:41 pm That "output voltage" setting of 5V seems like a good place to look, 944 coil needs 12V. This also could explain the dim test light.

Post a screen shot of the other options in the output voltage drop-down menu.

is the ECU powering the coil? the 5v setting seems odd - you mentioned that you were reading 12v at the coil.
Not sure what the 5v setting means?!

I don’t know, yet but this is where I’m focusing my troubleshooting for now. Also looking at dwell time per your earlier comment. And yes, the ECU is powering the coil with the help of an IGBT driver, which is installed. Need to make sure that’s working too.

I'm pretty sure the 951 coil is 12v ground triggered.

ealoken wrote: Thu Apr 17, 2025 8:27 am I'm pretty sure the 951 coil is 12v ground triggered.

yes, it is. so i wonder what the 5v setting it for?