Fuel injection system
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Elder User
Joined: Dec 2006
Posts: 830
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From: Kitchener,Ontario,Canada
Fuel injection system
Does anyone know if our vans (EFI) have simultanious bank fired, or sequential injection ?
I ask the question because my engine analiser (scan tool operated) shows 2 banks of Pulse widths. However bank 2 does not show any variation after about 10 seconds. Dropping down from about 25-50 milli secs on start up to about 6 milli secs, where it stays. In colder weather it tends to drop from initial high cold start reading to a larger figure (12-15 ms). Bank 1 varies with throttle opening & engine demand. Generally reading in the 3-10ms range when warmed up. I'm thinking that maybe the bank 2 injector pulse is constant to keep topping up the fuel stream in the fuel rails, while bank 1 adds to enrichen the ratio on engine demand from the o2 sensor TP & other sensors.
Anyone know thw real scoop on our Fuel inj systems?
BTW I'm mostly interested in 96 - 3L engine with OBDII- EEC V computer.
Thanks in advance, Aeroman.
Link to general EFI theory http://www.picotech.com/auto/tutoria...njection2.html
I ask the question because my engine analiser (scan tool operated) shows 2 banks of Pulse widths. However bank 2 does not show any variation after about 10 seconds. Dropping down from about 25-50 milli secs on start up to about 6 milli secs, where it stays. In colder weather it tends to drop from initial high cold start reading to a larger figure (12-15 ms). Bank 1 varies with throttle opening & engine demand. Generally reading in the 3-10ms range when warmed up. I'm thinking that maybe the bank 2 injector pulse is constant to keep topping up the fuel stream in the fuel rails, while bank 1 adds to enrichen the ratio on engine demand from the o2 sensor TP & other sensors.
Anyone know thw real scoop on our Fuel inj systems?
BTW I'm mostly interested in 96 - 3L engine with OBDII- EEC V computer.
Thanks in advance, Aeroman.
Link to general EFI theory http://www.picotech.com/auto/tutoria...njection2.html
Last edited by Aeroman59; Feb 21, 2007 at 06:17 PM.
Lead Driver
Joined: Sep 2003
Posts: 7,016
Likes: 209
From: SoCal
I think by 1996 they must have all gone to sequential injection. My 1990 and 1991 4 liter engines are both bank fired injectors. Don't have quite the elaborate monitor that you have, so I don't know what king of pulse widths they work on.
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
the Aero 3L was SFI by '93 and on, the 4L was still BFI in '94, '95 ?, '96 on SFI
all of the above is based upon Ford supplied info which is old and unverified...the originals have been dumped into Detroit landfills
Ford Serv CD for 96 3L
Fuel System, Multiport Fuel Injection (MFI) -- Aerostar
The multiport fuel injection system (MFI) is classified as a multi-point, pulse time, speed density control, fuel injection system. Fuel is metered into each intake port in a sequential firing order. Fuel injectors (9F593) pulse to follow engine firing order in accordance with engine demand through fuel injectors mounted on a tuned intake manifold assembly.
The powertrain control module (PCM) (12A650) accepts input from various engine sensors to compute the required fuel flow rate necessary to maintain a prescribed air/fuel ratio throughout the entire engine operational range. The powertrain control module then outputs a command to the fuel injectors to meter the appropriate quantity of fuel.
The powertrain control module also determines and compensates for the age of the vehicle and its uniqueness. The powertrain control module will automatically sense and compensate for changes in altitude (i.e., from sea level to mountains) and will also permit push-starting the vehicle should it become necessary (manual transmission only).
Rangers and Explorers got ESFI several years before the Aero
the '96 3L Aero EVTM shows separate actuator circuits from the PCM to each injector but of course Ford could have done what ever they wanted as far as SFI or BFI in the PCM injector algorithm
http://fordfuelinjection.com/files/GUFB.pdf
http://fordfuelinjection.com/files/FoMoCo_1996_OBDII.pdf
http://fordfuelinjection.com/files/Tuning_Injector_Timing.pdf
more of the same
http://fordfuelinjection.com/?p=20
all of the above is based upon Ford supplied info which is old and unverified...the originals have been dumped into Detroit landfills
Ford Serv CD for 96 3L
Fuel System, Multiport Fuel Injection (MFI) -- Aerostar
The multiport fuel injection system (MFI) is classified as a multi-point, pulse time, speed density control, fuel injection system. Fuel is metered into each intake port in a sequential firing order. Fuel injectors (9F593) pulse to follow engine firing order in accordance with engine demand through fuel injectors mounted on a tuned intake manifold assembly.
The powertrain control module (PCM) (12A650) accepts input from various engine sensors to compute the required fuel flow rate necessary to maintain a prescribed air/fuel ratio throughout the entire engine operational range. The powertrain control module then outputs a command to the fuel injectors to meter the appropriate quantity of fuel.
The powertrain control module also determines and compensates for the age of the vehicle and its uniqueness. The powertrain control module will automatically sense and compensate for changes in altitude (i.e., from sea level to mountains) and will also permit push-starting the vehicle should it become necessary (manual transmission only).
Rangers and Explorers got ESFI several years before the Aero
the '96 3L Aero EVTM shows separate actuator circuits from the PCM to each injector but of course Ford could have done what ever they wanted as far as SFI or BFI in the PCM injector algorithm
http://fordfuelinjection.com/files/GUFB.pdf
http://fordfuelinjection.com/files/FoMoCo_1996_OBDII.pdf
http://fordfuelinjection.com/files/Tuning_Injector_Timing.pdf
more of the same
http://fordfuelinjection.com/?p=20
Last edited by 96_4wdr; Feb 21, 2007 at 10:20 PM.
