2000 Expedition 4.6

[Billme]

Did have a leak at the vent..
Description on the video
I got to tell ya, this smoke machine is a must have.. It can also do pressure testing

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[Billme]

I’m debating on wither to redo the joints on the main vapor line going back.. They passed the smoke test, but they’re crusty .
Heck, I’m going to change it all…let her rip

 

[Billme]

Ok, zoom in on these two pictures of the front and back vent valves.. They are actually check valves, checking toward the tank..
I’m wondering since both have the same looking crack, at the same place(what are the odds) if these are intentional..
The front seems to leak very slightly while no leak in the rear.. I wonder if it to allow the check to work properly..
Should I leave it alone, or cover with ultra black?

 

[Billme]

Well, all that work didn’t change, but the new pump gained 1000 rpm’s in test..
All done needed to be done, so it’s not in vain..
Got a mass airflow sensor.. The screws both snapped, so I’m waiting for the epoxy to cure, then put some screws in to hold the new sensor..
It’s a good fight..

 

[Billme]

I must have made a mistake somewhere during the smoke test.. I should have plugged the tailpipe, so everything could pressure up better.
After getting the new mass airflow on, it still pulses, at even higher rpm, nearly 3 grand, except when it idles to the low end, it sounds like a lope, like a hp cam. Still no lean codes..

 

[Billme]

Put the old Idle control valve back on and this changed the rom back down to 1500..
I ran another smoke test on the intake, still didn’t see anything but I can hear it now.. Seems to be coming from the egr area, but I don’t feel, or hear a change when a spray around it..
This thing is whipping me.. It may be doing like the ICV gasket..I’m going to check that.. If that doesn’t do it, I’m pulling the intake, and getting a new one, or if I can get just the lower intake..
What I did notice this time on live data, longterm fuel, was negative numbers, where they use to run 8 to 10.. You can tell the engine is running lean, I would think the PCM would be adding fuel..
Is this a sign, the pcm is damaged.. I got another week before my professional mechanic can see it..
Damaged one bolt hole on the ICV, but was able to fix with a tap.. The story continues.. I hope I’m not boring you guys too much…

 

[Billme]

How the heck do you guys deal with that PCV vac hose in the back of the throttle body? Dang! I guess I’m going to have to take the TB off to check it… This was a new hose, but ….
Since I had to add another gasket to the ICV, I also may have to on the throttle body, and EGR valve..It’s really hard for me since I can’t step down in the motor area, like I did when doing the timing job..

 

[Billme]

I checked my alternator, it was 14.4, so thinking the inverter might be giving off spikes, I unplugged it, and started it.. I thought I had found it, it sat there at 1100, from the usual 1500, wow..
After a few minutes it started the small pulsing, but not like before, like the ICV was correcting for the EGR opening, then it seemed to gain a little in the pulse..
I think I have two problems.. One is , even though the egr passed the smoke test when cold, and when it opens it starts sucking air, or somehow the electrical side is amplifying this.. I can’t explain the new drop of rpm’s during this party when I unplugged the alternator ..That new T7 that Harbor Freight has is mighty tempting right now

 

[Billme]

I’m convinced this is an electrical problem possibly the ignition switch.. At its worse pulse, I can shut of the engine, and restart a couple times, then it’s normal..
Manoman..

 

[Billme]

Getting closer… I made my appointment with my local shop..He has his shop at his house.. Anyway I was correct on my assumption that this was a command.. It was due to out of band operation ICV..He could reconfigure the control point on his computer, but when you turn the key off, and restarted, it was corrupt again..Hummm..
So I suggested we put a new ignition switch and a power control relay to make sure a clean pathway to the PCM gives us some better results..
If it corrupts it again, then I guess a new PCM will be needed