I have read that the 1995 5.8 F150/Bronco computer has issues. I don't know if is causing my intermittent stumbling/miss/bucking problems, but I came across this great link for EEC info (especially the EEC IV which my 1995 Bronco has):


Fuel Injection Technical Library » EEC Computers

 

Nice link....Ryan Matteson put together a bunch of great information that I link to almost everyday. It's great to see someone hosting his cache since he suddenly disappeared from public view.

I do disagree there is a "problem" with 1995 EEC-IVs. In general they are robust but all of them of this vintage are starting to suffer from failed capacitors, not only the 95's.

 

rla2005: Would you post a link to the info which Ryan Matteson put together in this thread? I searched for him in members and came up with nothing, probably because I don't have his username.

 

Start at the Home page at the site you posted the URL for http://oldfuelinjection.packrad.net/page1.html

Ryan is the author of the original site (Ford Fuel Injection). He used to hang out at Fullsize Bronco using screen name Fireguy5.0

 

Update: OK, guys. Conanski and others suggested that I look for possible arcing between plug wires. So at night I ran the engine and didn't see any arcing. So I replaced my EGR sensor and it didn't fix it (I don't think it needed replacement). I replaced my frame rail fuel filter (it really needed it) and my in-tank fuel pump (it needed that too). Nothing helped.

So, I pulled my PCM and opened it up to look for leaking/bulging of the three (now 20-year old) capacitors which notoriously fail in my EEC-IV PCM and the capacitors looked good, so I didn't replace them (although I will eventually).

After early morning Easter resurrection services (man those Presbyterians can sing!) at my mother in laws (because I had nothing to do) I was looking closely at the spark plug wires and I could see and feel roughness on the wire rubber where one wire was crossing over another wire. So I separated that wire from crossing over the other by stretching it over the valve cover plastic oil fill cap.

And the miss instantly was reduced.

Since then I installed a 9mm Ford Racing Spark Plug Wire Set* (from Summit Racing for $43) and two sets of Ford Racing Wire Separators ($14 ea. for plastic! but they look and work good), and guess what?

I HAVE NO MORE MISS OR HESITATION OR STUMBLING WHATSO-FRIGGIN'- EVER !!!

Let me repeat that for emphasis:

I HAVE NO MORE MISS OR HESITATION OR STUMBLING WHATSO-FRIGGIN'- EVER !!!

Finally, if you do this make, sure that you get a copy of your SPARK PLUG WIRE ROUTING DIAGRAM and follow it!!! Because of the firing order, certain wires have to run cross-ways to others (not parallel) so follow the routing diagram to a "T" and make sure you use wire separators (generics are half the price at Pep Boys) to keep the routed wires in place.

Just two cents from a guy who assumed it was the PCM and was about to replace it.

And finally, there is no substitute for pulling your PCM if you want to know its number. And if you can, photocopy or photograph the bar code and numbers on the exterior of the PCM. Otherwise, you are just guessing.

And one more thing, I attribute this all to the Easter Morning services. So go to church.


* The 9mm Ford Racing Spark Plug Wire set is really nice. Not only are the wires bigger than stock, but each wire for a specified engine is already fabricated in the correct length for that numbered cylinder (no need for you to cut and fabricate) and check this out: EACH WIRE IS NUMBERED ALONG ITS LENGTH WITH THE NUMBER OF THE CYLINDER IT GOES TO !!! (Even I couldn't screw this up.)

 

Good word to the wise. It is so easy to go down the rabbit hole with this stuff, as many different things can cause similar symptoms. Some folks here think we're better off with OBDS-I, but to me OBDS-II is awesome for figuring out these things.

As for your plug wires, isn't so much more satisfying to buy some nice hot plug wires than anti-pollution controls? One is like painting your house. The other is like having to replace the d@mn sewer line.

 

Is this what you are after?

https://www.ford-trucks.com/forums/1...l#post14205896

 

Nice to hear from the converted!

Thank you for posting up your findings.

 

Thanks for the link RIKIL