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Need Help Troubleshooting
Morning, everyone. I've got an '04 F350 6.0 (build date 17/04/04) that's got a bit of an issue.
When it's cold it has issues starting, rough idle, zero throttle response and I'm basically stranded for the first 15 minutes until it gets some heat in 'er. Once it warms up it idles fine and it works 100%... but only in first gear. I get all the boost and power I need, no misfires, no surging and perfect throttle response. As soon as it shifts into higher gears I get intermittent boost, basically no power, a bunch of misfiring and throttle response takes a dive. If I pussy-foot and don't hit much boost it doesn't misfire as much, but still doesn't work well.
I took it to the dealer yesterday and of course it's winter here and they didn't plug it in so it wouldn't start, so all they could do was test the FICM (which cost me $320 bucks) and told me I needed a new one (which I literally just tested the day before I brought it to the dealer and it put out 48v and 46v). Whatever. I pulled it out, re-soldered everything and threw it back in. Truck worked awesome. Shut it off, back on, wide-open-throttle from a standstill and still 100%. Put it into reverse and 100% of my problems came back.
Does anyone have any suggestions aside from replacing the FICM (which I am doing tomorrow)? I have a brand new EGR, GPM tested good, new ICP... I can't remember what else. I'm out of ideas and I'd rather tear into injectors last because I'm poor right now. My truck working 100% properly in 1st gear only and crap in every other gear is really throwing me off.
Now for the good part: I have no scan software or any kind of monitoring programs, so I can't answer any questions as to values.