Buzz/Grinding electrical noise coming from dash

[LTZ9C1]

I have a 2000 S-10 2WD and I've had this buzz, grinding electrical kinda sounding noise for the past 4 years.

At idle I can hear it but more once I accelerate and gets louder when I let off the gas pedal. It starts to grind and buzz like an electrical transformer would after getting hit by lightning.......annoying like a mofo

Any clues what is making this crazy noise? Dealerships are stumped also.

Thanks in advance.

[muddog321]

I'd look at a few of the common stranger things that I have had.
1. PCV valve rattle mormost at idle comes along the throttle cable if the plastic tie down on the drivers side of the intake breaks off - common after lower intake done. Resecure and possible PCV valve replace if aftermarket and check the valve cover grommet - yep it happens.
2. 99-01 have secondary air injection and that has check valves in the exhaust manifolds that always fail - internal spring and also rust out - see info in the How To on these.
3. Now if a more gurgaling sound thats the heater core.
4. Then possible relay chatter so listen in the underhood block or behind the glove box is the flasher/blinker one.
Hope its one of them!

[LTZ9C1]

Originally Posted by muddog321

I'd look at a few of the common stranger things that I have had.
1. PCV valve rattle mormost at idle comes along the throttle cable if the plastic tie down on the drivers side of the intake breaks off - common after lower intake done. Resecure and possible PCV valve replace if aftermarket and check the valve cover grommet - yep it happens.
2. 99-01 have secondary air injection and that has check valves in the exhaust manifolds that always fail - internal spring and also rust out - see info in the How To on these.
3. Now if a more gurgaling sound thats the heater core.
4. Then possible relay chatter so listen in the underhood block or behind the glove box is the flasher/blinker one.
Hope its one of them!

Thanks, problem solved.......FINALLY!!! opcorn:

It was the throttle cable hitting the PCV valve. The dealership said it was my fuel pump.......bastids!!!

Thanks a ton again