Nice find muttnjeff. To rule out the harness issue and confirm it was the computer you could have cut the wire close to the computer and put in a substitute load. I like to use reostats from amazon to do this. Then do your scope capture again and look for improvement. That would have proved it for y...

Sorry here is the link to the Autonerdz site.
https://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1582995710

Hi everyone just a fyi I will be doing a HD Engine Diagnostics Class in Clovis New Mexico on July 30 and 31st from 8am to 5 pm. Here is the link to the Autonerdz site with all the course info. If interested contact me through my website. www.mjediagnostics.com Thank you. I will be showing various Di...

Hello there, my name is Michael Eilbracht and I am a Picoscope Distributor for Autonerdz.com. I specialize in HD Applications for Picoscope. I will be doing a HD Engine Diagnostics class that will show me using Picoscope to diagnose issues with the 4425 Auto model. If you are interested contact me t...

Thanks for putting this up. Hopefully what I do will encourage more HD Technicians to use Scopes.

Can you scope all the Injectors with a current clamp and then use voltage for power and ground as your synch that way we can compare? That would help us identify a problem with the injectors. Have you done a relative compression test?

What are the conditions for your test? Are you at idle no loads on or at 2500 rpm with loads on? Or are you using a carbon pile to load the system? 12.64 Volts at the battery isn't going to cut the mustard on this. Did you load test the battery first before beginning any charge testing? Did you chec...

You could try Autonerdz and see if they have a known good. autonerdz.com. Plus post your scan data and captures. Thought I'd mention this since no one else has jumped in to help.

I would agree you need to do a good visual inspection and make sure you don't have any pullys binding before moving on. If that's ok I would then drop a pressure transducer in a cylinder and have either another tranducer in the intake at a centralized location and crank the engine over and analyze i...

A capture would be nice. Plus if you could post some scan data and codes. That way we can help you better.