Where are the ground connections that I have to worry about? Ever since I did the 6.0 swap I've had p2681 and now I've been getting a code for low voltage on my knock sensors.

The truck runs normal when the codes are off/cleared but when they come on I go rich. Its driving me nuts!! I cleaned the block connection for the ground wire coming from the battery, and the 2 on the backside which one is in the trans harness and the other is in the loom for the passenger side injectors.

any suggestions on what could cause this problem?

another symptom that leads me to a ground issue, my voltage drains down on certain things. just putting up the windows or running the defroster. It'll spike and then come back up.

I don't recall nor have I seen any pinched wires

 

I also get low voltage codes for bank 2 sensor 2 O2 sensor

 

anyone?

 

no one?

could bad knock sensors cause this?

 

Recently sprayed your engine bay off, or ever?

 

Not the new setup

 

junkyard lq4 that was sitting outside? check the knock harness connector? where they ground etc.. If you cant find anything might want to take the intake off and check them just to be sure.. they corrode pretty easy if water gets to them.

 

well I bought the motor used, but it wasn't a junkyard motor. I tried changing the knock sensors but here's another question.

How do I remove a knock sensor that wont come out? I tried replacing the back one, but when I broke it loose it just spins but doesn't unscrew. I don't know what they are called but I think there is something like this pressed in the block which the knock sensors screw into and its just spinning but doesn't come out



that's the knock sensor location on my 4.8