need help ecm question

[ffosnaugh2]

I have an 86 bronco that has a carbed 302 with the aod tranny...pullin up a hill today the ecm started smoking...question is this...since the beast isnt a fuelie do i even need the ecm and what does it control

 

[Bully Bob]

It's the brain for the ignition.  the coil, the dizzy,etc.

YES you need it. 

Somebody check me on this.............. B)

 

[ffosnaugh2]

Not bein rude but hows come i can start the thing just fine after i unplugged and pulled the ecm then? Has a unilite distributor if this helps any

 

[Bully Bob]

That is a mystery.., give us a pic(s)..!

That will help us help you.

Also, all known info. mods, etc. Unilite isn't stock.

It's tough diagnosing over a keyboard.... >< <'>

 

[ffosnaugh2]

What was smoking was once under the dash and looks like an amplifier...it uas two 8 pin connectors coming out of it...any chance it is just an amplifier for the stereo...ps bullybob... I tried to upload some pics but cant...my phone doesnt support it i guess

 

[Rons beast]

It could be an amplifier....the ECM should have it's own fuse.  I had an amp in an old Chevy Monza once that lit a fire under my dash...in a church parking lot ! (please withhold comments about devil music.)

As Bob said, you could have other modifications as well...so who knows.  Can you pull out the "smoking box" and tell if any markings are on it?

 

[ffosnaugh2]

So i stuck my head under the dash and located the ecm....what was smoking was a radio amplifier...now i feel stupid, but at least i became a member of a pretty spiffy site...thanks guys...noobie

 

[miesk5]

yo flo;

Have some engine bay connectors swinging-in-the-breeze? around intake manifold; or carb. etc?

here are some 86 Bronco 302 eng bay component pics for EFI and with an ECM; compare and unused connectors to these diagram and list the components.

http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=27438

http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=27446

Some wiring diagrams to help ID ckts and components;

Start Ckt http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=27271

http://www.revbase.com/BBBMotor/Wd

Some background;

Electronic Engine Control History, Ford; 1978: "...Ford Motor Company introduces its first “Electronic Engine Control (EEC-I)” system. This system was very limited in the control of engine functions and only controlled ignition timing, EGR flow and the air pump's injection of air into the exhaust. 1979: Ford introduces the EEC-II system. This system added air/fuel ratio control (feedback carburetor), throttle kicker (controls engine idle speed during start up and AC function) and canister purge control to the ECC-I system. 1980: Ford introduces the EEC-III system. This system included all the sensors used by the ECC-II system, with the addition of a temperature Sensor. In 1981, the ECC-III system was modified to include controls for the new Electronic Fuel Injection systems. The EEC-III system was used on some models of Ford vehicles until 1984. 1980: In addition to the EEC-III system, Ford introduced another computer control system, called the “Microprocessor Control Unit (MCU)”. This system was used on a limited number of Ford vehicles up until 1991. 1983: Ford introduces the “Electronic Engine Control - IV (EEC-IV)” system. This system is capable of controlling a larger number of sensors, switches and actuators, and was used on a greater number of Ford vehicles. The ECC-IV system was used from 1983 to 1995. 1994: Ford introduces the EEC-V system (OBD-II). This is a highly sophisticated system that uses more special programs to enhance the computer's capability to monitor, detect and report failures, especially to the vehicle's emission system. This system was introduced on a limited number of 1994 and 1995 vehicles. Starting in 1996, all Ford vehicles (cars and light trucks) sold in the US are equipped with the EEC-V system..."

Carb Conversion pics in an 87 by illinoisbronco http://www.supermotors.net/registry/20370/69259

Converting 88' to carb http://broncozone.com/topic/18694-converting-88-to-carb/

Mustang fuel injection to carburetor conversion http://www.fast351.com/cartech/fitocarb.htm

Mustang fuel injection to carb conversion http://www.fast351.com/cartech/fitocarb.htm

 

[ffosnaugh2]

Thankya much miesk5...when i get a minute i shall peruse the info in the above post...sure ill gain some knowledge!!! Much needed knowledge ta boot