Throttle Body Humming Issue

Just wanted to hop on here and try to help some people out. I have a 2004 with the 4.7, I had an issue where when my truck shut off the Throttle Body would make a humming noise. It would drain my battery dead and leave me stranded. I searched this Forum for a solution but never found one. I replaced the throttle body, ecm, and a whole bunch of fuses to no avail. Finally pulled the main fuse box out from under the dash and the whole back of it was corroded. I replaced the Fusebox and haven’t had a problem with it in a year. I also highly advise soaking the contacts in dielectric grease to eliminate any other problems that may be caused by water getting into the connections. I also struggled with this. Summary, Fusboxes go bad and dielectric grease is your best friend.

 

Appreciate this, and yes, we have this info thread with all the stuff people should know about these trucks. It covers your exact issue, see red text here, this bullet point is in the 'electrical stuff...' section. Click the link to "pics", you'll find many friends:

• These trucks usually don't have a ton of other electrical issues. Hidden corrosion inside the battery/alt cables happens. Sometimes, a couple thousand miles after timing belt changes, people will have startup issues because the crank position sensor wasn't properly tucked away and gets rubbed by a belt (pic), correct routing info here. There's also a similar problem with camshaft position sensor under the cam cover, where the belt will rub through (pics). There's the rodent issues mentioned earlier. Occasionally, water trails down harnesses into the ECM behind the glovebox (pics, pics), or the in-dash fusebox (pics & pics & pics) it happens a LOT. Many drain/vampire issues trace back to aftermarket add-ons whether the owner knows they exist or not - alarms as mentioned earlier, brake controllers, poorly installed trailer receptacles, those are some big ones.

Unfortunately for you, if you haven't made attempts to fix the A-pillar or windshield leak that led to your fusebox getting corroded out - these can come from cracked windshield, rusted windshield surround, or water leaking into the A-pillar from either (A) the vertical trim strip alongside the windshield or (B) busted driver door rubber seals.

Water will often leak into the connectors behind the plastic driver side kick panel next to your left foot as you're driving. We've seen it get into the 15-20 pin connector attached to the sheet metal, and also into the 5-6 pin connector that feeds the electronic throttle control.

 

@Logan850 here's the other thing you need to check: https://www.tundras.com/threads/abs-sensor-speed-control-sensor-or-both.143136/#post-3995062