[badass_lt1]

Hi, per the title everytime I put in a new fuse to control the NPP valves (Fuse 51) it works for a bit until I pass 2k RPM's and then it blows. Any ideas on how to fix this? Thanks!

[Aaron07]

Sounds like one of two problems: Either the motor that operates the exhaust valve is going bad and therefor drawing more current then it should, or there is something wrong with the mechanical valve itself. Does the fuse blow when trying operate the valves? Edit: just read the last part again about the 2k rpm. Hmm that does sound strange

[Tschw]

Did you recently change your exhaust? I had all kinds of weird issues where my valves won’t work at all and I would be missing all the settings in my infotainment. I took it back apart and found out that the drivers side npp solenoid weather seal in the connector got pinched and let water in and corroded all the connections. After I cleaned everything, fixed the seal and put dielectric grease in the connector, I haven’t had an issue since and that’s been a year.

[badass_lt1]

yeah i took off my MBRP axleback and put back on the NPP which worked fine for two months. it started with the npp plugs falling out constantly and so i took it to the muffler shop to plug in and it has been blowing fuses ever since then.

[SomeGeoffGuy]

Originally Posted by badass_lt1

yeah i took off my MBRP axleback and put back on the NPP which worked fine for two months. it started with the npp plugs falling out constantly and so i took it to the muffler shop to plug in and it has been blowing fuses ever since then.

Time to crawl under there and see exactly what the muffler shop did. It sounds like whatever they did is causing the harness to short out. Your harness-side connectors might need to be replaced due to corrosion if you ran for a while with them unplugged. Or the muffler shop could have cut the connector and tried to attach the wires directly to the valve.

If you have a good parts guy at the local Chevy Dealer, he should be able to find and order a new connector repair kit which will have the connector and some wires with terminals on the end. Snap it together with the new wires, then solder it in, shrink seal the splices, and you should be good to go.

-Geoff