johnday in BFE

iTrader: (1)

No problem.

Blue2016XL

@johnday Wasn't there another user here that had a solenoid issue. Even replaced with from another vehicle that had a known working one and still had the issue. Then bought a new one and it worked just fine?

johnday in BFE

iTrader: (1)

I sorta recall that, IIRC, he was one of the guys that was using a Dorman replacement?

Blue2016XL

I don't recall. Wish I could find the post. It was a 2 to 3 months back.

johnday in BFE

iTrader: (1)

Ya, and there's so many threads and posts on this subject, I get confused as to which/who I'm talking with.

Blue2016XL

Yeah, and I think I found the post but, not exactly how I remembered it but, the OP might find it useful anyway. Go to post #88:

https://www.f150forum.com/f118/grind...375234/index9/

johnday in BFE

iTrader: (1)

Yes, I recall that one. Wish @Zack23434 would post how things turned out, he had quite a lengthy thread. IIRC, the dealer, last I heard, was waiting on a new TCCM to be installed back in March.

05Ford

Thanks for the info guys. Sounds like Zack was having the exact same issue I'm having. I sent him a PM to see if he had any update on his situation. I tested things again this morning after clearing a TCCM code I found via Forscan (C1979 - IWE solenoid circuit failure) and the solenoid seems to be working normally, and now I'm getting about 17 mmHg of vacuum to the IWE's. Which now allows the wheels to spin independently of the half shafts when the truck is jacked up. Now whether I caused this code by screwing with the solenoid is anyone's guess, but now I'm getting vacuum! One thing I did notice though was that if I cycled the ignition to test the solenoid several times without starting the engine, I lose vacuum after about the 5th ignition cycle. So my question is, how is vacuum generated on these trucks? I can hear a pump running with each ignition cycle, but I'm thinking that charges a different vacuum system since it doesn't affect the vacuum reading on the IWE system. So does the engine have to run to build vacuum to the reservoir? I'm wondering if by only cycling the ignition I'm depleting the stored vacuum from the last engine start, since it seems to return to normal if I restart the truck and test again.

johnday in BFE

iTrader: (1)

Yes, whenever the engine is off, the system will vent off vacuum at the solenoid, locking in the IWE. By turning the key like you were, likely did as you thought, depleted the vacuum reservoir.

With the GENII 3.5, Ford went to a different vacuum setup, no pump, it appears to be a venturi tube setup, called "ActiVac". I haven't been able to find a lot of info on it. I could be 100% wrong here, so don't quote me as fact. I "think", vacuum is supplied as normal from the intake, when you go into a boost condition, I "think" manifold pressure/flow, is routed thru a venturi, [ejector/eductor whatever you want to call it], and provides vacuum.
Anyone reading that, if you know more, please post.

No one take as gospel what I just described!!!!!!!!

GoodVibes

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