6.4L Power Stroke Engine and DrivetrainDiscussion of the 6.4L Power Stroke diesel engine and drivetrain in the 2008 Super-Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.4L Power Stroke engine.
Part of the computer program that controls your engine is a subroutine called the cold ambient pkg (CAP). When the oil temp and the intake air temp (IAT) are cold enough, the engine will automagically idle up to a faster RPM when in park or neutral for more than a minute or so. Another part of the CAP is control of the exhaust back pressure valve (EBPV). When the oil temp and IAT are cold, the EBPV will close to put a tiny bit of load on the engine.
Even after the oil gets warm, if the IAT is cold enough the CAP will kick in.
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My Sierra Blanca is a '99.5 PSD CrewCab hot-rod Towing Machine! BTS tranny; TurboRamAir intake and 4" stainless turbo-back exhaust; DP-Tuner tunes flashed into an Edge Evolution tuner; ISSPRO EV gauges and TTM; AIC; SP-Diesel exhaust brake and torque converter controller. I special-ordered it new and plan to drive it until it quits.
I may be wrong but it seems to idle up more than my 02 7.3. I can't tell between idle up and regen mode as well..I wish the message center told when in RGen mode..I'm curious if it's doing it or not.
Despite what I've been reading here with some of the posts at DStop this truck is very smooth all around. I mean no problems or gliches.
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08 F350 Lariet DK.Blue/Silver CC Short Box SRW. Auto transmission, Manual 4x4,Supplemental Cab Heater,3.73 Limited Slip.Gator Guard Bedliner, 6.5 x 12 Sno-Pro,8ft. Fisher.
04 Lance 820.
Here are some of the words from the Ford 2008 powertrain control/electronic diag (PC/ED) manual:
Engine Oil Temperature (EOT) Sensor
The EOT signal is used by the PCM to calculate fuel quantity and injection timing.
At low ambient air temperatures and an oil temperature of less than 70°C (158°F), low idle is increased to maintain stable idle quality. Fuel quantity and timing is controlled throughout the total operating range to provide adequate torque and power.
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Intake Air Temperature 2 (IAT2) Sensor
The IAT2 sensor is located in the intake manifold. The sensor provides a manifold air temperature signal to the PCM. The PCM uses the IAT2 signal to control timing and fuel rate during cold starts and provide an input to the cold idle kicker.
(Note: There are two different IAT sensors on a 2008 PSD. This is one of them.)
Last edited by SmokeyWren : 02-26-2008 at 08:43 AM.
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Linear Mode
