Compression Ignition Addict
Join Date: Jan 2013
Location: Whidbey Island, WA
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I've not lived in AZ and so I'm not exactly sure what summer time engine temps would be there but on my truck in both Colorado and in WA I usually run about 186 - 195 unloaded while cruising on the highway. And so 200 - 212 seems kind of high to me unless those temps are with the A/C on as well but I'd still think the temp should be lower than that. I'd first start with changing out the thermostat since it's easy to replace. They usually fail open but perhaps yours isn't opening all the way? Something else to check is if your degas cap is leaking. Could just be time for a new cap but could also be signs of head gasket issues. And you might even want to start monitoring your radiator fan. Maybe it's not spinning up like it should.
As for the FICM voltage, I've read that anything below 46 volts is cause for concern. You are fine at 47 volts.
As for the ECT/EOT delta, the test is to warm up the truck to operating temp, then drive at 65 mph for 20 minutes on flat road and if the difference is 15* then you have an issue.
Hopefully others will chime in soon.
2006 F-350 XLT FX4 SCLB 6.0L | TTY head bolts | stock EGR and cooler | blue spring FP mod | PHP Atlas 40 FICM tune | ScanGauge 2 & GlowShift 3-in-1 gauge (Boost/EGT/FP) | PMM coolant filter kit | Flo~Pro 4" turbo back w/muffler | stock tune