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Gen II 3.5 Egoboost vac pump

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Old 10-20-2017, 05:22 PM
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What I found odd were the connections. I had a supply line coming from manifold, I assume, that had a tee on it. One side of the tee disappeared into the firewall, the other end plugged into the solenoid valve. On the other side of the valve, is a single line that also has a tee, with both sides of that tee, going to the IWE's, I assume again. I saw no vent line anywhere. I did not pull any wheel and actually look at the hub end of the tubing. Got it home, and made a few phone calls, 20 minutes or so, then pulled the connections I made apart. Still had vacuum going down to the hubs, so I almost think the IWE seals aren't leaking. I'm at a loss now, I hope one of the guys that knows me works on it tomorrow so I can get the straight scoop as to what's going on.
Old 10-20-2017, 07:42 PM
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Yeah there is only one line from the solenoid. I traced mine from there to each IWE. The hose from the IWE itself has 2 hoses molded together. One side goes up to the solenoid (larger one if I remember right) and the other side goes up to the frame and goes nowhere. Everything I read says that one is the vent hose. Not sure how it works unless there is also a one way valve in the IWE hub and it sucks air in rather than out when the solenoid stops suppling vacuum. All a guess on my part. I have not been able to find a good explanation on how that part works. If you get a good explanation, I'd love to hear it.
Old 10-20-2017, 08:36 PM
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Hopefully tomorrow I can grab someone and find out, and I'll post what I find.
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Old 10-21-2017, 01:09 PM
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Found out the vacuum system relies on the vac pump to provide vacuum and not the engine manifold vacuum at all. Also, where the solenoid/valve is mounted, turns out that is a vac reservoir, and the small line I thought was going thru the firewall, is actually the vac supply to that reservoir. If you look at the vac supply line where it's clipped to the reservoir, that is a check valve right next to the clip. There was a lot going on today, and only 2 mechs, so I didn't want to delay them anymore.

My hub: The bloody thing was grinding intermittently the first 10 miles to the dealer, it's a 35 mile trip one way, so by the time I got there, of course it wouldn't do it when everything was warmed up, so, and I understand, nothing could be done at this point. The system vac was being held, we verified that. The salesmanager with his truck, has had the same hub replaced 3 times, and finally got one that didn't grind.
I'm just gonna drive it to failure, and go from there. Everything is documented, and don't foresee any problem with getting it fixed when it does crap out entirely.
The mech told me to likely expect it to get worse as the weather cools off. He sorta kinda feels it's the seal inside.

One thing, these guys at the dealer are friends of mine, and strings have been pulled for me in the past, so I'm not about to get upset about it. They've legitimately done all that can be done at this point.
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chimmike (10-22-2017)
Old 10-21-2017, 05:20 PM
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Originally Posted by johnday
My hub: The bloody thing was grinding intermittently the first 10 miles to the dealer, it's a 35 mile trip one way, so by the time I got there, of course it wouldn't do it when everything was warmed up, so, and I understand, nothing could be done at this point. The system vac was being held, we verified that. The salesmanager with his truck, has had the same hub replaced 3 times, and finally got one that didn't grind.
I'm just gonna drive it to failure, and go from there. Everything is documented, and don't foresee any problem with getting it fixed when it does crap out entirely.
The mech told me to likely expect it to get worse as the weather cools off. He sorta kinda feels it's the seal inside.
That sucks that it wasn't doing it when you got there. If it's not doing it, not much they can do to diagnose it other than check things are tight.

If it is anything like how mine went, it won't be long. It only took about 2 weeks for it to go from once in a couple of days, to every morning (oddly enough always at the exact same spot on my way into work) and then doing it in the morning and in the evening. Replaced it the Thursday of the week it was doing it every morning and that Friday was the first time that it didn't do it. So it was a pretty good bet that was my issue. Still believe so. Come to think of it, it did start when the weather started getting cold. Down to around the mid 40s.

Well, you know things seem to go wrong around the time that the temps start to drop for winter or rise for summer. Never much in-between.

Keep us posted.
Old 10-21-2017, 07:17 PM
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LOL, oh yeah on the getting cold. This coming week, it's supposed to be more seasonal, hopefully the thing will crapright out before I head downstate to my wife's the 2nd. I could always drive the Ranger, but I'm wanting to see how this thing acts on the expressway at 75mph. Interested in the fuel mileage too. As it is, this thing does better than the Ranger.
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Old 10-22-2017, 08:30 AM
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it's tough to keep my foot out of it on the interstate. 80mph cruise is quite comfy.
Old 10-22-2017, 09:09 AM
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Originally Posted by chimmike
it's tough to keep my foot out of it on the interstate. 80mph cruise is quite comfy.
Ya, it is for me on the skinny roads so far. The lie-o-metre is saying just short of 22mpg, but geez, this thing has some *****. I haven't loaded any tunes yet either, crap, I might scare myself!

Well, no, that won't happen.
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Old 10-22-2017, 09:29 AM
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Originally Posted by jjc155
I'm gonna see if I can get it to do it in the morning on the way home and try to shift into 4hi while its making the sound. Guessing if that it the issue the noise would stop or change.
What were the results of this?
Old 10-22-2017, 11:41 AM
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Discovered something this morning.
I left my house, and went to 4hi once I had it straight. Went to 2hi making corners, but everytime I had it straight, I put in 4hi. Did this for around 3 miles. Then went back to 2hi. No grinding, not once, the rest of my trip.
Really don't know what bearing that had on the hubs, but it worked.
Give it a shot guys, won't hurt anything unless you're trying to turn.



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