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Power Strokes
7.3 Aftermarket
Auto PCM with no Auto...
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[QUOTE="Charles, post: 1247787, member: 103"] I removed the ability of my Ford PCM to run my trans shifting into the ground by installing a PCS on my 2002 crew cab and now I have two options for the engine control... I already had a manual trans PCM for my year and had planned to switch to it, but apparently Ford decided to get cute and F' up the harness between auto and manual so that I'll have to re-pin at least the connector at the PCM to make that work, as it's stuck in some kind of limp mode because it thinks the coolant temp is high, plus the trans temp gauge on the dash is dead with a comfy red "Check Gauge" starring at me. Otherwise..... the original auto PCM drives around fine except for a surging at certain load/rpm points, where I assume it's having some sort of separation anxiety about not being connected to the trans or something. It will run MFD from the 60's to the 20's, 60's, 20's over and over in rapid succession about once a second or so until you push through it with more throttle, or lift. It does it just the same on cruise control, and all the sensor readings I can view on the scanner are steady and stable. So.... Since the truck drives nicely for the most part with the auto PCM and my harness is already working, plus I can still use the trans temp gauge I'm stuck with in my dash (by having the PCS send it a signal), does anyone know how to tell the PCM to STFU about the bs and just run the engine? Does anyone know what is making it surge the MFD repeatedly in the first place at certain load points? Is it trying to shift? Any input would be great. At the moment I'm missing my 99-2000 stuff that gives no ***s... If I have to repin this harness then a DAC PCM may be finding its way in. But I'd rather not dick with all that. [/QUOTE]
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