She's getting better but....

1999 Freightliner FLD120, Cummins N14 with Eaton 10 speed for reference. Over a million miles.

Still working the bugs out of the old girl. Finally used her this weekend for what I got her to do. She did really good but here are a few issues I would like to get fixed.

1. The motor will occasionally go into a limp mode and it feels like power restriction and the rpm's are limited to 1500 rpm. Go a few miles and she picks right up again and starts pulling great again. No fault warnings or lights. Any ideas what system/sensor would cause a limp mode without a light?

2. The idle control & jake brake quit working. Found the clutch pedal switch is loose and should be a simple fix when I get to it.

3. After running for about 30-45 minutes, the tach does something weird. It doesn't quit working but it drops down approximately 1000 rpm. Be running 1500 rpm and the tach reads 500 rpm. Really no big deal as I am becoming more familiar with the truck sounds and feels at the right rpm's but still enough to want it to get fixed

Biggie is the limp mode situation. Am I going to need to get the freightliner adapter for my Snap-on scanner to get a proper diagnosis? I would imagine.

 

That's what I was thinking. Maybe just a simple connection issue. When I dig into it, I'll use the electrical connection cleaner, compressed air and then the silicone and hope I correct the issue without even finding it. lol

I did see a little white in that fuse holder. I'll do it when I'm doing the rest of the connectors. Wouldn't hurt.
I did run a new ground to the frame and ran a second ground straight to the starter. You can never have too many grounds IMHO.