We recently had an overheat situation with our F150. We were pulling the 8 mile 6% grade up to the Blue Ridge Parkway westbound on US 421 towing our 2001 Safari 25. While I do not have weight data as loaded, based on previous weights I'm certain that the trailer was under its GVWR of 6300#. The truck was probably about 100 -150# over its payload capacity, but the GCVW should have been under the GCVWR. Per the owner's manual the Max Tow is 8600#. Deducting the truck payload of around 500#, that still leaves 8100# for a trailer around 6300#.
As we climbed up, temperatures rose and speed dropped. The truck is a 2006 F-150 Lariat 4x4 with the 5.4 V8, automatic transmission and a 3.73 limited slip differential, running Shell regular gasoline. I have the Edge Evolution tuner installed and running in Tow mode. I have the display set to show cylinder head temperature, oil temperature, and transmission fluid temperature. I figured the engine temperature gauge on the dash would be sufficient for water temperature.
About 1 mile from the top, cylinder head, oil, and transmission fluid temperature reached around 230 degrees but the dashboard engine temperature remained on the center mark. I heard a metallic pulsating noise that sounded like a belt flapping around hitting stuff under the hood. I pulled over and checked under the hood and, aside from smelling hot, everything seemed normal. We sat for a while and let the temperatures subside to about 220 and then did the last mile.
I don't understand how the truck overheated with the temperature gauge right in the middle of normal. It hardly moved from its normal position. It acts normal when the engine is warming up. My guess is that the noise was coolant spot boiling on the head or fuel detonation due to the high cylinder head temperature.
Does anyone have any ideas as to what the noise was? IS there anything I could have done with driving technique to minimize the overheating?
Thanks,
Al
As we climbed up, temperatures rose and speed dropped. The truck is a 2006 F-150 Lariat 4x4 with the 5.4 V8, automatic transmission and a 3.73 limited slip differential, running Shell regular gasoline. I have the Edge Evolution tuner installed and running in Tow mode. I have the display set to show cylinder head temperature, oil temperature, and transmission fluid temperature. I figured the engine temperature gauge on the dash would be sufficient for water temperature.
About 1 mile from the top, cylinder head, oil, and transmission fluid temperature reached around 230 degrees but the dashboard engine temperature remained on the center mark. I heard a metallic pulsating noise that sounded like a belt flapping around hitting stuff under the hood. I pulled over and checked under the hood and, aside from smelling hot, everything seemed normal. We sat for a while and let the temperatures subside to about 220 and then did the last mile.
I don't understand how the truck overheated with the temperature gauge right in the middle of normal. It hardly moved from its normal position. It acts normal when the engine is warming up. My guess is that the noise was coolant spot boiling on the head or fuel detonation due to the high cylinder head temperature.
Does anyone have any ideas as to what the noise was? IS there anything I could have done with driving technique to minimize the overheating?
Thanks,
Al
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