Join Date: Aug 2009
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The truck in last 15 000 miles has new ford heads with stock gaskets and arps egr bypass and oil new cooler. Its getting cold here so I was installing new oe ford injectors and noticed some white residue near rhe degas cap so I replaced the cap last weekend. 300 miles later i have a touch more degas white residue.
I just hooked up a pressure gauage and between full throttle and a degas psi increase only happened once out of ten full trottle runs. That time though it did get up around 17 psi. The rest of the time it seams to set itself at about 7.5 psi not caring on how its driven.
Were the new heads checked for flatness? Ford heads are notoriously not flat.
I had a similar issue before I studded. Under a load I could see 22 psi in the cooling system, and the cap would vent as it's supposed to. Now I see 7 - 8 psi coolant pressure, which is just the temperature fluid expansion pressure.
2006 CC SB 4x4 6.0L
BPD 6 Phase 53v FICM, EGR, HD Oil Cooler, Bypass Oil Filter & Water Pump
ARP Studs w/ OEM Gaskets
DC Power 190a upper; DB Electric 200a lower alternator
295/65/20 Toyo MTs
PMF 3 Link
7,500LB Tuff Trucks Leveling Coils
Icon 2.5 piggyback CDC shocks
Dynatrac Free Spin Kit with Dynaloc Hubs
EDGE CTS Monitor w/ EGT, pressure, and temp sensors
Blue FPR Spring Kit
Twin F450 Auxiliary Springs
Banks Monster Exhaust
Truetrac rear/E locker Front with 4.11s