O5 injector knock??

[Tucu]

I just replaced my thermostats and now my truck has what seems to be a crazy knock. Any help is appreciated tia. And this is a code that’s popped up, idk if it’s a coincidence that it started knocking right after the T-stat swap or if the wiring right next to the alternator is screwed up.

 

[MrMarty51]

Welcome TUCU.
Did a quick search.
I think You are on to the problem with the wiring thing.
Make sure that no wires got pinched in Your repair process.

 

[dbrannon79]

I second a wiring issue. see if you can find a schematic on your rig and check all wires and connections in and around the area you were working at. I found this tidbit on the web on this code.

P0090 Fuel Pressure Regulator 1 Control Circuit Open

 

[Lennydmaxguy]

The pressure regulator is on the CP3, which is directly under the Tstat housing. You may have pinched a wire. I did that the first time I did mine, only the coolant temperature sensor wires were the victim.

 

[Tucu]

Yeah I ended finding the issue, the wiring for the fpr came out of the connector. Now the injectors are leaking, idk if we blew the seals since it wasn’t regulating pressure or the seals just let some fuel bypass at that pressure. But gonna find out soon enough