[MoovinTarget]

My 1991 Shop Manual shows ECM pin 4 as IDM. Should pin 4 be START. It also shows ECM pin 46 as SPOUT not pin 36 as I see in other diagrams on the forum. Anyone know if these are errors?

 

[Seattle FSB]

:scratchhe

Both of your graphics are incorrectly labeled for the Bronco. First off, PIP is always the #1 pin closest to the ICM orientation notch. Neither my 1990 nor my 1995 Bronco EVTMs show EEC Pin #46 as connected to the ICM. Pin #46 is an EEC sensor Signal Return.

On the other hand, EEC Pin #36 is the SpOut connected to ICM Pin #2. This is true for both Push Start and CCD ICM Bronco and Mustangs. The graphics below are for my 1990 Bronco, which is the same as your 1991.

I believe your schematic is actually referencing a Speed Density Ford F150 EVTM, which is not the same as the Bronco. What EEC are you actually using, the original 1991 5.0L Bronco EEC? Or did you change the wiring harness and computer with your new engine?



1990 Bronco EVTM

 

[MoovinTarget]

Thanks SeattleFSB,

The first diagram is wrong. Must be a misprint. The actual Pinout of the ECM designates pin 36 as SPOUT and 46 as a Sensor Signal Return as you stated.

The TFI connector in the second diagram was reordered by me. I have the original with PIP at pin 1. I changed it because of a testing flow chart I was using that had them inverted. I got tired of translating the real position from the flow chart position so I made a compatible one. In other words I screwed up a few tests standing out in the rain and cold and decided to make life easier.

I understand the Push Start vs CCD and remote vs Dist mount. I have also learned that Ford started dicking around with timing in the 93+ modules to reduce torque when shifting to save some warranty dollars on transmission damage. They also tried to reduce heat by altering dwell via the ECM. There does seem to be a difference between the Auto Tranny and the Manual Tranny ICM's. Do you have a cross reference that specifies Tranny type? Check out these links:

http://www.veryuseful.com/mustang/tech/engine/EECIVInnerWorkings/

https://www.google.com/url?sa=t&rct...XINHdavywgNAD&usg=AFQjCNErIpaliXs-ksdcelGHBiNMBWMBRA&bvm=bv.85142067,bs.1,d.bGQ

 

[MoovinTarget]

What's up with the handwritten edits on our image #2 TFI ICM (scan 002) for Gray Dist Mounted ICM on SuperMotors? Is that for a specific year range? For the transmission type of Auto or Manual?

 

[MoovinTarget]

Hey Seattle FSB,

Notice the difference in the wire colors of the TFI Module Pinout between your 1990 and my 1991? I'll verify the actual colors on my 1991 tomorrow.

 

[MoovinTarget]

Dy-1284 for Manual Transmission

This is what O'Reilly Auto has listed for a DY-1284

Motorcraft - Ignition Control Module
Part Number: DY1284
Line: MOT
2 Year Limited Warranty
UPC: 31508639584
Ignition Module
Manual Transmission
With Distributor Mounted Module
MODULE-IGNITION

 

[MoovinTarget]

Rock Auto does not mention transmission type any longer:

More Information for MOTORCRAFT DY1284

https://www.rockauto.com/catalog/moreinfo.php?pk=5434788&cc=1105973

Motorcraft® Ignition Module Highlights Include:
Designed to operate under a wide range of temperatures (from -40º to 125ºC)
Shielded for noise-free radio or CB reception
Helps ensure no premature firing, misfiring or shutdowns resulting from transient outside signals
Designed to meet vehicle requirements for conformance to government fuel economy and emission standards.
Alternate/OEM Part Number(s): 5U2Z12A297A, DU2Z12A297A, DY1074, DY1076, DY425, E43Z12A297A
_______________________________________________________________________

More Information for MOTORCRAFT DY1074

https://www.rockauto.com/catalog/moreinfo.php?pk=990336&cc=1105973

Motorcraft® Ignition Module Highlights Include:
Designed to operate under a wide range of temperatures (from -40º to 125ºC)
Shielded for noise-free radio or CB reception
Helps ensure no premature firing, misfiring or shutdowns resulting from transient outside signals
Designed to meet vehicle requirements for conformance to government fuel economy and emission standards.
Alternate/OEM Part Number(s): 5U2Z12A297A, DY425, E43Z12A297A

 

[MoovinTarget]

I contacted two Ford Dealers and asked them to run my VIN to figure out what ignition was in this Bronco at birth. They both insisted on not running the VIN and instead went with Year, make, model, trim, tranny, and engine. Not much help.

I found a Ford OEM part house that did run the VIN. He came up with 1U2Z12A199AA. This appears to be a Duraspark Ignition module. This rang a bell from almost 20 years ago when we dropped this Ford Racing 5.0HO in the Bronco which was driven by my wife at the time. I vaguely remember picking up a Mustang Distributor, tossing out the ignition module and installing the TFI module in the wee hours of the morning as advised by an associate when the engine was received. We crossed our fingers, fired it up and it ran. Both of my sons have driven the truck for several years each. It is now back in my hands.

A couple of years ago I put some injectors in it because it had little pep. It did not help, but it ran good enough for Jacob to go to school and back. I am now wondering about the ignition performance due to the ad-hoc Duraspark to TFI conversion.

It does run with a Push Start Module. I have a DY-1284 in my hands now, so I know I can get it back on the road. What else should have been done to make this conversion perform properly?

 

[Seattle FSB]

What's up with the handwritten edits on our image #2 TFI ICM (scan 002) for Gray Dist Mounted ICM on SuperMotors? Is that for a specific year range? For the transmission type of Auto or Manual?

If you had read the caption, you would have seen that it is to change from EEC-IV to CCD TFI ICM. Read this entire link: Ford TFI Ignition Control Modules

Notice the difference in the wire colors of the TFI Module Pinout between your 1990 and my 1991?

No problem. The wires still go to the same locations. :thumbup

This is what O'Reilly Auto has listed for a DY-1284

Manual Transmission

Never trust a general parts house for TFI ICM selection. :banghead

Ford does not specify a specific transmission application.

I found a Ford OEM part house that did run the VIN. He came up with 1U2Z12A199AA. This appears to be a Duraspark Ignition module. This rang a bell from almost 20 years ago when we dropped this Ford Racing 5.0HO in the Bronco which was driven by my wife at the time. I vaguely remember picking up a Mustang Distributor, tossing out the ignition module and installing the TFI module in the wee hours of the morning as advised by an associate when the engine was received.

I am now wondering about the ignition performance due to the ad-hoc Duraspark to TFI conversion.

Never trust a general parts house regarding TFI ICM selection. :banghead

The 1U2Z12A199AA (aka DY893) is a module for Duraspark Ignition which came in a pre-EFI carbureted Bronco. Your 1991 was EFI from the factory and used EEC-IV Ignition.

What else should have been done to make this conversion perform properly?

You did not make a Duraspark to ECC-IV conversion unless you reversed a previous EEC-IV to Duraspark conversion.

Motorcraft DY1074
Motorcraft Supersession info:
• DY-425 Replaced By DY-1074
• DY-1074 Replaced By DY-1284

This is from the Official FordParts.com website regarding Distributor Mount TFI ICMs... Just install the DY1284 TFI ICM and move on to something else.


Here is something else you can obsess with: Dielectric Grease vs Thermal Grease :toothless

 

[MoovinTarget]

Thanks. done.

 

[MoovinTarget]

CORRECTED Diagrams and Pinouts

CORRECTED Diagrams and Pinouts

 

[MoovinTarget]

ICM Module DY-1284

Module Received and installed. Cranked right up. Will update after timing and test drive. Fighting with Power Steering at moment.

Ordered a DY-1284 based on DY-425 supercession info from Seattle FSB.

 

[MoovinTarget]

Corrected Diagram. Also includes HE signals from Stator: