m stumped, yesterday I replaced the cam synchronizer thinking it was my problem, nope. I still have this crazy noise coming from the motor? I just dont know where to go next? at first I was thinking pilot bearing or the clutch slave, but noise doesnt change it you push the clutch in. ive checked the vacuum lines and pulled the serpentin pelt off. when you turn the motor off you can hear it wind down for a second while the motor stops. I 4th or 5th gear at low rpm if you accelerate it will go away like vacuum until the motor catches up to it. I was thinking cam sync because the churp, chirp wurrr was different than the rpm of the motor. whats left? oil pump?

 

Unplug the Blower/fan in engine bay, just a 2 wire connector
See if the noise goes away, on shut down of engine

 

Fan, Unplugged didnt change, sounds like passenger side front of the motor, I pulled the serpentine belt off once, might do it again so I can get closer to the motor.. I'll check all vacuum hoses again too.
Maybe with the belt off I can take a better video? the sound should be better.

 

"4th or 5th gear at low rpm if you accelerate it will go away"

Yes, that would be vacuum, when you open the throttle the vacuum in the intake drops, if you do that with a high load(low speed/RPM, 4th/5th gear) vacuum drops very very low

Passenger side down low at the front is the Vacuum reservoir ball

This is where its located: https://www.explorerforum.com/forums...obe-jpg.39621/

That picture is with the fender removed, lol, you don't need to remove the fender to access it, it is just a good picture for where it is on the vehicle, down low on passenger side

 

Yes ive seen it. there's 2 sm vacuum lines that go to it I think. im guessing that if I unpluged them that could make it stop if thats it?

 

No, you would follow 1 of its hose to the engine(other hose goes to the firewall and inside the cab)
Unplug the engine end of the hose and plug the port/connection it was plugged into
And then see if noise is gone

 

Well just pulled the line that went to the motor plugged the vacuum reservoir ,,,,,, no change. its pretty loud with a whuur whuur kind of beat to it. I dont think its at the same rpm as the motor? I'll pull the serpentine belt and see if I can pin point it some how? you would think its vacuum by what it does, but ive pulled all the major and minor vacuum lines off the manifold, you would think if it was vacuum that would do it, nope?

 

im not sure what to do? acts like vacuum but there's noting left to check. I'll go over all major vacuum ports on the manifold. its pretty loud and changes some with rpm, not there over 3000 rpm? im pretty sure its differently in the motor. I'll pull the serpentine belt soon because its much quieter with out all things going around. Im still looking for ideas, camshaft bearing? thanks

 

so question, I think there are 3 major vacuum ports, if I pulled and plugged the all and it kept going would that mean its not vacuum? ideas? I dont know how to isolate this?

 

Look at the PCV line and valve?

 

Ok I found a Pic of the manifold There are 3 vacuum places to attach lines. If I plug all 3 of these and the noise is still there it can not be caused by vacuum. how does that sound? Ideas?

 

solved but not fixed, instead of having positive crank ventilation I have negative , there's quite a bit if I put my thumb over the valve cover hole where the PCV valve goes. if I cover the hole with my thumb the noise will start. so what is this? im going to start a new thread. the noise is found, if I leave the PCV valve out it won't make the noise. now to find it.