Need help before I scrap her....
Post Fiend
Joined: Oct 2003
Posts: 9,176
Likes: 4
From: Western Central NV
I agree, but being Ford trained on the EEC III systems back in the day, Ford has one of the best computers on the market. If you read on troubleshooting the EEC is the very last thing & most of the time is not the problem.
That was my only point.
I believe you will find what I say on this site for one. Fuel Injection Technical Library
Craig
That was my only point.
I believe you will find what I say on this site for one. Fuel Injection Technical Library
Craig
Elder User
Joined: Dec 2003
Posts: 660
Likes: 3
From: Northern California
WHOA there kermmydog.
There IS a known problem with the FORD PCMs that IS occurring more frequently as time goes by.
Due to their age, the electrolytic capacitors used in the FORD PCMs ARE starting to leak AND will fail.
The electrolitic capacitors DO have a service life to them.
There have been MANY MANY posts on here regarding this issue.
"Back in the day" when you were factory trained, I'm sure leaking capacitors in the FORD PCM's wasn't an issue.
Perhaps Brad will chime in here and once again post his findings at the salvage yards.
I'm not trying to start a whizzing match, but your statement above, today, now, at present, is incorrect.
Bob
There IS a known problem with the FORD PCMs that IS occurring more frequently as time goes by.
Due to their age, the electrolytic capacitors used in the FORD PCMs ARE starting to leak AND will fail.
The electrolitic capacitors DO have a service life to them.
There have been MANY MANY posts on here regarding this issue.
"Back in the day" when you were factory trained, I'm sure leaking capacitors in the FORD PCM's wasn't an issue.
Perhaps Brad will chime in here and once again post his findings at the salvage yards.
I'm not trying to start a whizzing match, but your statement above, today, now, at present, is incorrect.
Bob
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
It isn't, it's like saying our trucks are un-reliable because they're 20yo and starting to have failures (yes, if they aren't properly mantained problems will surface, but they're mostly very tough and reliable). His statement is right, but every part on a car/truck/machine has its life, and most of ours have probably outlived the calculations made by Ford.
Tuned
Joined: Oct 2012
Posts: 440
Likes: 8
I agree, but being Ford trained on the EEC III systems back in the day, Ford has one of the best computers on the market. If you read on troubleshooting the EEC is the very last thing & most of the time is not the problem.
That was my only point.
I believe you will find what I say on this site for one. Fuel Injection Technical Library
Craig
That was my only point.
I believe you will find what I say on this site for one. Fuel Injection Technical Library
Craig
I picked up my Bronco for $500. Only one side of the injector harness had injector pulse. New computer and boom, I've been driving it for 3 years now without a lick of trouble.
My F250. Picked it up for $800. Constant fuel pump run issue and no injector pulse, new computer solved it too.
One of my buddies has a truck just like OP's except it's a two wheel drive. He went through a new TFI, coil, distributor (thought it was a pip problem) and lo and behold he changed the EEC and it's been running like a champ without issue for months now.
Also, I have a friend who worked for Ford for over 20 years and he said he changed a LOT of the computers in the 460 trucks (like my F250) while he worked there.
So maybe you haven't had computer issues, but where I am, we have them and they are common.
Elder User
Joined: Dec 2003
Posts: 660
Likes: 3
From: Northern California
I'd like to tell you my own personal experiences with the EEC-IV (that's what THESE trucks use, not EEC-III)
I picked up my Bronco for $500. Only one side of the injector harness had injector pulse. New computer and boom, I've been driving it for 3 years now without a lick of trouble.
My F250. Picked it up for $800. Constant fuel pump run issue and no injector pulse, new computer solved it too.
One of my buddies has a truck just like OP's except it's a two wheel drive. He went through a new TFI, coil, distributor (thought it was a pip problem) and lo and behold he changed the EEC and it's been running like a champ without issue for months now.
Also, I have a friend who worked for Ford for over 20 years and he said he changed a LOT of the computers in the 460 trucks (like my F250) while he worked there.
So maybe you haven't had computer issues, but where I am, we have them and they are common.
I picked up my Bronco for $500. Only one side of the injector harness had injector pulse. New computer and boom, I've been driving it for 3 years now without a lick of trouble.
My F250. Picked it up for $800. Constant fuel pump run issue and no injector pulse, new computer solved it too.
One of my buddies has a truck just like OP's except it's a two wheel drive. He went through a new TFI, coil, distributor (thought it was a pip problem) and lo and behold he changed the EEC and it's been running like a champ without issue for months now.
Also, I have a friend who worked for Ford for over 20 years and he said he changed a LOT of the computers in the 460 trucks (like my F250) while he worked there.
So maybe you haven't had computer issues, but where I am, we have them and they are common.
A man with four first hand experiences with FORD PCM's failed/failing.
Who woulda' thunk.
Back to the OP's problem.......
I have to agree, your fuel pressure is too low for the 4.9.
Before you plunk down the cash for a new FDM, or worse yet, scrap the truck, make ABSOLUTELY sure this isn't a poor/resistive ground problem.
Both of my fuel pumps were "whining" pretty loud (I have to assume laboring) prior to me cleaning off the block ground @ the starter, frame ground (where the negative cable attaches via the little crimp connector, negative battery cable clamp, negative battery post, and lastly, the ground on the fender near the battery (10 guage wire).
A wire brush in a drill works extremely well for this.......and wear eye protection.
Bob
Tuned
Joined: Oct 2012
Posts: 440
Likes: 8
Well if you wanna get technical, I only have 3 first hand experiences with PCM failure. This fourth that you speak of is just what my Ford buddy said. And like I said, he worked for Ford for 20 years and has his own successful shop. So if he says they're common, and I too have had to replace computers in a recent period of time, I'm going to also agree with him that they are a more common problem than people like to think.
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