Gary Lewis Posted July 12, 2018 Share Posted July 12, 2018 Interesting. So you had the EEC with an output that went low above a given RPM, a vacuum switch that was closed above a given vacuum, and a transmission switch that was closed in all but top gear. That then presumably tied to the Shift indicator bulb, which was fed 12v when the key was on. Right? Email address sent. Thanks! That is my basic understanding of it. I just sent you the details. Yep, that's the way it works. Thanks, Cory. Link to comment Share on other sites More sharing options...
Rembrant Posted July 12, 2018 Share Posted July 12, 2018 Yep, that's the way it works. Thanks, Cory. It's very simple logic, isn't it? There's no way for the truck to know what gear it's in prior to top gear, so the EEC has a preset RPM in which an output is fired. If the vacuum is high (throttle closer to being closed), then a switch closes and fires the indicator light. Time to shift. Interesting. I assume the transmission offered in the MPG packages was the four speed where 4th was OD? (I'm not very familiar with all of the Bullnose manuals, but I presume that it was not the trans with the granny low 1st gear? It wasn't an automatic, and it wasn't a 5spd. That doesn't leave much else. Has there been anybody show up on any of the forums with one of these trucks with the shift light still operational? I haven't seen it in my travels, but then again I wasn't looking for it either;). Link to comment Share on other sites More sharing options...
1986F150Six Posted July 12, 2018 Share Posted July 12, 2018 Yep, that's the way it works. Thanks, Cory. It's very simple logic, isn't it? There's no way for the truck to know what gear it's in prior to top gear, so the EEC has a preset RPM in which an output is fired. If the vacuum is high (throttle closer to being closed), then a switch closes and fires the indicator light. Time to shift. Interesting. I assume the transmission offered in the MPG packages was the four speed where 4th was OD? (I'm not very familiar with all of the Bullnose manuals, but I presume that it was not the trans with the granny low 1st gear? It wasn't an automatic, and it wasn't a 5spd. That doesn't leave much else. Has there been anybody show up on any of the forums with one of these trucks with the shift light still operational? I haven't seen it in my travels, but then again I wasn't looking for it either;). No operational upshift light, but I can tell you that the 1984 routinely returned 26+ mpg @ 60-65 mph [many times] prior to the wide spread introduction of gasohol. Link to comment Share on other sites More sharing options...
Rembrant Posted July 13, 2018 Share Posted July 13, 2018 ...I can tell you that the 1984 routinely returned 26+ mpg @ 60-65 mph [many times] prior to the wide spread introduction of gasohol. Outstanding! Link to comment Share on other sites More sharing options...
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