I just spent about two days of quality time replacing all of my vacuum tubing, and chasing circuits in an attempt to get my S83P 4WD system to shift properly. I finally found it!!! Mud dauber wasps had filled one of the VSV vent filters with mud and eggs, plugging it solid. Once cleared, everything now works as it should. Easy enough to check as they just pull off. Just another thing to be aware of. Cheers
I could see that the front diff locker was struggling ( and failing ) to pull into lock, so I pulled the hose off the other side and blocked it keep the vacuum, allowing the servo to vent to atmosphere, and it worked great. This indicated that the VSV was not venting properly. I pulled the filter and could easily see the wasps handiwork. I pulled all four and one other was partially blocked as well. Cleaned them out with a wooden toothpick and a bit of compressed air
Little buggers I have had them fill the fuel tank vent line on one of my motorcycles. Causing vacuum in the tank and loss of fuel
Yeah their a nuisance. That makes sense how you cleaned them out. I didn't know if you had another method! I'm always willing to learn new tricks! Thanks! Limestone