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Hello all! This is my first post here. I have owned my 85', 4.9, F150, short cab, long bed, 4X4, with manual trans for about 9 months now. I love this truck! I may even like it better than my 2017 Mustang GT (not sure though). The truck has the original feedback carburetor system. I plan on keeping that system for now because I like to play with weird "in-between" technologies.
I have done a lot of research and figured out how to use the self test with a light to get codes from the OBD-I system. What I am curious about are the extra data pins on the OBD-I connector(pins 1 and 3). Does anyone know what data protocol those pins use? Is it some form of Serial such as UART? If so, what baud rate is it?
Another question I have is related to the later sequential fuel injected motors with distributor ignition. Is there some form of Cam position sensor in the distributor? If not how did the EEC-IV/V system know when to trigger each injector? A crank position sensor alone couldn't do it, because the computer couldn't know if the cylinder was on an intake stroke or a power stroke without knowing where the cam is.
I know these are weird questions, but I have some ideas for a couple of potentially fun projects.
Ford had some weird system they used on the assembly line that would talk to the computer very fast, instead of sitting there watching the codes blink out and repeat themselves. There are some guys that have broken into this system and know all the ins and outs, but it gets complicated and you can't hardly understand what they are talking about.
The computer used the dist to keep the injection timing and the ignition timing straight. I believe one of the teeth on the wheel down in the dist was wider than the others, and that's how it knew where it was in the firing cycle.
There is a wire leaving the ignition module which is the raw timing signal. It's called the PIP signal (Profile Ignition Pickup). This signal goes into the computer where it uses it for various things, and it also takes this signal and modifies the timing of it, and then sends it back to the ignition module on the dist. This is called the SPOUT signal, the one you have to disconnect to set the timing.
Ford had some weird system they used on the assembly line that would talk to the computer very fast, instead of sitting there watching the codes blink out and repeat themselves. There are some guys that have broken into this system and know all the ins and outs, but it gets complicated and you can't hardly understand what they are talking about.
The computer used the dist to keep the injection timing and the ignition timing straight. I believe one of the teeth on the wheel down in the dist was wider than the others, and that's how it knew where it was in the firing cycle.
There is a wire leaving the ignition module which is the raw timing signal. It's called the PIP signal (Profile Ignition Pickup). This signal goes into the computer where it uses it for various things, and it also takes this signal and modifies the timing of it, and then sends it back to the ignition module on the dist. This is called the SPOUT signal, the one you have to disconnect to set the timing.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.
