2000 Expedition 4.6

[Billme]

Well , the new ignition switch and relay didn’t change a thing…..
I had this alternator rebuilt at a place I’ve been doing business for years, the grand kids are running it now.. It has made a whining sound ever since..I’m down to changing the alternator with a brand new one, or ordering a PCM..

 

[Billme]

I also got my fuel rail extension for this harbor freight fuel pressure gauge since the harbor freight adapter broke..
New pump is rated at 50 lbs, but running pressure is 36 without the fuel pressure regulator hooked up, otherwise it’s few pounds lower.. Kinda disappointing, but barely in specs..
Engine runs good, has good power, just the idle is getting
They fit the ford, and the harbor freight PG if you ever need one..
Fuel Injection Pressure Tester... https://www.amazon.com/dp/B09XBFM1Y9?ref=ppx_pop_mob_ap_share

 

[Billme]

I unplugged the alternator again, it just drops rpm with a smaller command..
What’s weird is during the 1500 rpm pulsing 400 rpm’s, you can turn the key off, Restart and it will do what’s it’s supposed to w1000 rpm’s, then drop to 750.. It will stay steady for several minutes, the start in small increments, and build up a few hundred rpm’s.. You hit the peddle to the floor real quick and let off, it hangs a few places, and all of sudden it goes back to the small pulses at 750..
Since it still does it with the alternator unplugged, my only choice is a PCM now..
Any comments?

 

[Billme]

During my smoke test, I didn’t look at the bottom.. Would a rear seal large failure cause this pulling through the oil drain holes? I do leak oil there…I got to thinking about it again hehe, even though my local man confirmed my thoughts..
Anyway, I’m taking it to a electrical automotive expert in the morning..

 

[Billme]

Ok he confirms I need a pcm, now which one to get..
Any suggestions? I hope they have upgraded processors that are much faster hehe

 

[Hamfisted]

Confirm the part number on your current PCM if you can.

Flagship One Replacement PCMs





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[Billme]

Thx my friend.. Will I have to have my keys programmed if I take it out to get the part number? I’m driving it now since the ICU calibrated correctly smoothed the engine out, but still gets that hit. Much easier to deal with..

 

[Hamfisted]

The PCMs will come with two pre-programmed keys, but they WILL have to be cut to match your door locks and ignition switch. Give them your current PCM part number, and your Expy's date of manufacture and VIN just to make sure you get the most accurate replacement PCM.

 

[Billme]

Sounds good to me.. Many thanks Hamfisted

 

[Billme]

I decided to wait a week before continuing this path, just to refresh my options on this diagnosis, so I went out and cranked up the expedition and still the same, but I noticed something different.. I decided to turned on my light switch and noticed my radio leds and mileage leds dimmed significantly.. I checked the adjustment Roller to make sure it was maximum.. It would still dim.. This is not normal.. Several months ago I had the alternator redone..It seems I started noticing little quirks pop up, and finally where I am today..
They did break a generator mounting bolt in my intake I noticed and didn’t tell me about it..Very po’ed about that..There is a whine coming from the alternator, but the last two mechanics didn’t mention or supposedly find anything..
I’m wondering how I should proceed..