V6 engines use a CMP 3+1 tooth trigger wheel. Four cylinder and V8 engines use a CMP 4+1 tooth trigger wheel. The CMP trigger wheel has a number of equally spaced teeth equal to the number of cylinders on a bank plus one extra tooth (n+1). The VCT (variable cam timing) system consists of an electric hydraulic positioning control solenoid, a CMP (camshaft position sensor) and trigger wheel. The IPS system is on Lincoln LS, Thunderbird and Focus SVT and the DEPS system is on the F150 5.4L 3V. The elimination of the EGR system is accomplished by controlling the overlap in valve opening between the intake valve opening and exhaust valve closing.Ĭurrently for the 2004 model year, Ford Motor Company uses the PS and DEPS systems. In addition, on some applications a VCT system can eliminated the need for an external Exhaust Gas Recirculation (EGR) system. IPS systems also have the added benefit of improve torque. VCT systems provide reduced emissions and enhanced engine power, fuel economy and idle quality. At part and wide open throttle the PCM controls cam timing based on engine RPM, load and throttle position. At idle and low engine speeds with closed throttle, the phase angle are controlled by air flow, engine oil temperature and engine coolant temperature. Intake Phase Shifting (IPS) system - the intake cam is the active cam being advanced.ĭual Equal Phase Shifting (DEPS) system - both intake and exhaust cams are phase shifted and equally advanced or retarded.ĭual Independent Phase Shifting (DIPS) system - where both the intake and exhaust cams are shifted independently.Īll systems have four operational modes idle, part throttle, wide open throttle and default mode. There are four types of VCT systems.Įxhaust Phase Shifting (EPS) system - the exhaust cam is the active cam being retarded. Variable Cam Timing (VCT) enables rotation of the camshaft(s) relative to the crankshaft (phase-shafting) as a function of engine operating conditions. Heres some information I have found on VVT for the SVTF Which #4 is also the worse reading of them all which is 60 PSI. Secondly I can see oil coming up on each of the cams lobes except for lightly on #4 intake. As far as oil goes I have not mechanically checked but was good up to it not starting. Although I would dought fuel pressure would cause low compression. If you need a new alternator or other charging system parts, you can shop our selection of replacement alternators, car batteries, and starters to find the parts you need to make your repair.I was going to test the fuel pressure but have the wrong fitting so i was not able to test tonight. If you're not sure whether your alternator is the source of the problem, check the tension of your belts to make sure the alternator is spinning while the engine runs, and stop by your local O'Reilly Auto Parts where we can test alternators on or off of your vehicle. If you notice that your headlights dim when using your power windows, or if your battery just won't stay fully charged, it may be time to replace your alternator or other charging system parts. Your car might die, but you might be able to restart it with a jump start or by recharging the battery to park somewhere safe. When the alternator loses capacity or fails, the electrical systems of your vehicle will only stay on until the battery's reserve charge has been depleted. Over time, the internal windings and brushes of the alternator can wear out or become contaminated with grease or oil, and this can keep the alternator from producing adequate voltage for recharging or operation. The alternator is driven by the engine belt and may be controlled by the engine computer or voltage regulator to prevent overcharging. The alternator recharges the battery to restore power that is depleted during starting and keeps the electrical accessories on your car powered while it is running.
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