Quantcast RAMORRISON1 Introduction - Ford Truck Club Forum




Home






Forum






Gallery






Garage






Blog






Arcade






Settings






New Posts






TOTM






Vote




Remember Me?
       Join for free!




Search






How-To's






Unanswered






FTC Toolbar






Social Sites






Register




 
Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1973-1991 Ford F150



Welcome to FordTruckClub.net
Welcome to FordTruckClub.net, the internet's premier Ford truck community! You are currently viewing our boards as a guest which gives you limited access to view discussions and access other forum features. By joining our free online community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple, and absolutely free so please, join our community today!

Forgot your password? click here.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

 
Thread Tools Search this Thread Display Modes
  #1  
Old February 24th, 2018, 09:41 AM
ramorrison1's Avatar
ramorrison1 ramorrison1 is offline
 

Join Date: Feb 2018
Posts: 2
Likes : 0
Liked 0 Times in 0 Posts
Default RAMORRISON1 Introduction

Hello Members of Ford Truck Club,

Found this site looking up info on the EEC-IV ECU Board Components. My 1988 F150 5.0L AOD decided to take a rest and not start. After performing all the Spark and Fuel checks started in on the Battery and System checks where I found I wasn't getting VREF to the TPS, MAP, and EGR sensors.

Further isolation led me back to the ECU, so I removed it and opened the case to find a crispy chip with three of the pins off the DIP CHIP had burned into the PWB board.

Can find all the info on the 60 pin ECU Connector and the EEC IV control functions to the sensors and actuator, but nothing on the ECU board layout to determine which input lines caused the chip to fry.

Figured if I could get the schematic of the ECU PWB layout could determine what line/component shorted or froze up to cause the over current to the unit.

I've ordered a new ECU that will arrive on Tuesday. Guess I get to spend the weekend ringing out the entire wiring harness to each component for grounds to signal side, and then checking across the components to determine which one is bad.

Attaching some pics of the ECU Board and chip that is burned. It's at the side of the board next to the Heat sink/voltage regulators. Would be greatly appreciative if someone could ID the signals that DIP Chip controls.
Attached Thumbnails
Click image for larger version

Name:	ecu pwb top 1.jpg
Views:	47
Size:	75.7 KB
ID:	1418   Click image for larger version

Name:	ecu chip 1.jpg
Views:	47
Size:	40.0 KB
ID:	1419  
Attached Images
 
  #2  
Old February 26th, 2018, 10:11 AM
harrison28's Avatar
harrison28 harrison28 is offline
 

Join Date: Mar 2015
Location: St. Cloud, Fl.
Posts: 1,378
Images: 23
Likes : 196
Liked 8 Times in 7 Posts
Default

Central Florida welcomes you to the club. Good luck finding a diagram for that board. If I had to guess, that chip just gave up the ghost on you. Is that green capacitor next to it before or after the chip? If it's before, looks like it wasn't a surge since it's not swollen or busted. Kinda hard to see without having it in my hand.
  #3  
Old March 6th, 2018, 08:52 PM
ramorrison1's Avatar
ramorrison1 ramorrison1 is offline
 

Join Date: Feb 2018
Posts: 2
Likes : 0
Liked 0 Times in 0 Posts
Default

Thanks CF for the input. Believe a lot of that Chip burn started a very long time ago. Have a No Start issue and ended up checking a bunch of things. Have always had a TPS Error code so checked the Vref signal to the TPS, EGR, and MAP Sensors and found it was missing.

Decided to pull the ECU and found the burned chip. Replaced the ECU and now have Vref, but still a No Start. Replaced the TFI and stupidly didn't mark the Distributor when lifting, so had to put back to TDC. Of course the Oil Pump Shaft had to pull out and make things more a Pain.

Rang out all the wiring from ECU Connector to Sensor, Actuators, Grounds, and Fuel Inj. Didn't get any AH HA readings of Shorts or Opens to anything.

Get Spark at Cap, but not sure getting a Good Spark at Plugs. Think the Vref has been bad for a long time and caused Truck to run rich. I only drive it to run chores once in a while, and never got down to correcting all the drivability problems - too many other projects always seem to come first.

Anyway, believe I may have Flooded the Intake. This was the first Truck my Dad bought Brand New back in 1988, so one day wanted to restore. Redid the Engine back about 5yrs ago because of the same problem, but once I got it running never perfected the drivability. TPS fault code makes me think the Vref issue was there back then. Since rebuilding the engine it always starts, but runs very rough at times. Replaced the CAT back with engine and again about a year ago, so pretty sure sending too much fuel and not enough air and/or spark.

Don't have a garage to work in (True Shade Tree Mechanic), and weather has not cooperated the best. There always seems to be something else to fix or work on for family, friends, neighbors, etc., so the Truck gets to sit for now. It still looks good and could be a really nice truck again one day.
  #4  
Old March 7th, 2018, 03:24 PM
harrison28's Avatar
harrison28 harrison28 is offline
 

Join Date: Mar 2015
Location: St. Cloud, Fl.
Posts: 1,378
Images: 23
Likes : 196
Liked 8 Times in 7 Posts
Default

Is the throttle cable stretched? Maybe not be opening the throttle body enough to allow
for the correct air flow. My throttle cable on my 91 was fraying before I had changed it. Less strands holding it together make it more prone to stretching.


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


(View-All Members who have read this thread : 5
Br549 , DoubleDee , glc , harrison28 , ramorrison1

Similar Threads
Thread Thread Starter Forum Replies Last Post
My introduction RichB New Member Introductions 4 April 10th, 2017 01:55 PM
Introduction mefreeman New Member Introductions 3 December 21st, 2016 09:08 AM
Introduction irish12671 New Member Introductions 3 February 29th, 2016 08:39 AM
Introduction ZRU01 New Member Introductions 2 April 7th, 2015 09:08 AM
Introduction My 76 High Boy 1948-1986 Ford F250 | F350
5 June 14th, 2010 10:18 PM

Tags
introduction , ramorrison1

Forum Jump









FordTruckClub.net is not authorized, endorsed or affiliated with the Ford Motor Company
or any of their subsidiaries. Ford® is a registered trademark of the Ford Motor Company


Powered by vBulletin® Version 3.8.6 Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.