Russ
Member
Did you ever try putting it in 4wd then back to 2wd to see if would go away? That same sound happens to me randomly every few weeks, replaced check valve 2 weeks ago and suddenly today same sound came back but goes away after putting in 4wd. Will be replacing Solenoid then testing iwe if it comes back
Yup, that's the tell tale sign of the IWE issue I think. If you move into 4A you should notice the sound go away (however, mine got to the point where it wouldn't!).
The dealership called me and said they were gonna "replace the vacuum system" on my truck since it keeps coming back despite the frequent solenoid replacements.