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Nissan Altima And Line Pressure Control Of Solenoid Valve
 A solenoid valve is an electromechanical valve for use with liquid or gas controlled by running or stopping an electric current through a solenoid, which is a coil of wire, thus changing the state of the valve. The operation of a solenoid valve is similar to that of a light switch, but typically controls the flow of air or water, whereas a light switch typically controls the flow of electricity. More..
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Engine Failure And Nissan Altima
Engine failure is the constant complain Nissan Altima face from their consumers. Although the expectation was quite high from a brand like Nissan but it is very unfortunate to have a frequent engine complaints. |
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Though this car has a new look with advance features but the most disappointing factor of this car is its 2.5 engine. It is often complained that the car has certain starting problem in cold weather, which even dealers could not define. However according to the guidelines provided by the experts at Nissan, hold the gas pedal until it cranks and the engine starts. This formula worked but the engine finally starts with emitting thick black smoke. This could be quite a disaster as the EPA may decertify the car.
According to some consumer report this is what really happens with Nissan Altima. The real failure has more to do with variable valve timing.
- The oil gets thick in cold weather posing a problem during the start.
- The E.C.M. (engine control module) tests all the components before every start cycle, but this start problem only occurs erratically during cold weather.
- The I.V.T. (intake valve timing control solenoid) receives its test pulse, but due to the thick cold oil can drive the intake cam to an over advanced condition.
- With the intake cam advanced for operation beyond 2,000 RPM and the starter motor cranking the engine below 500 RPM the near static compression is nil compared to the dynamic compression of a high revving motor with an advanced cam.
- Cold cranking an engine with low compression while injecting fuel results in a flooded engine.
- Holding the gas pedal down while starting from this failed condition causes more fuel to be injected, more air to flow through the engine and the throttle position sensor to tell the E.C.M. that the throttle is wide open. The E.C.M. senses the RPM of the engine is at cranking speed (too low for an advanced cam), The PHASE (camshaft position sensor) signals the E.C.M. that the cam is advanced and the E.C.M. commands the I.V.T. to retard the cam, however since the oil is still cold and thick this takes several cycles to work - resulting in more flooding until the engine finally starts.
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