Mitsubishi Lancer CK4 4G92 engine
This info is very useful for all ck4 user.
With 2 engines used each model 4G92 1600 cc and 4G93 1800 cc available with a five-speed manual or four-speed auto
for now we discuss about 4G92 engine model,
The Specification of 4G92 engine:
Engine model 4G92
Engine type SOHC 16V
Bore x Stroke, mm81 x 77.5
Compression ratio 10 : 1
Max.power (Net), kw(PS)/rpm113ps/6000
Usually the common failure found on this model was loss of ISC, ECU damaged, Air flow not work , loss of TPS, Oxygen sensor failed .Each of them is very expensive .Someone who looking for lancer f-style used car must know about the failure symptoms of engine part and how the each engine part function.first the engine Control Unit,the engine Control Unit (ECU) also known as an Engine Control Module (ECM) or Powertrain Control Unit/Module (PCU, PCM) if it controls both an engine and a transmission, is an electronic control unit which controls various aspects of an internal combustion engine's operation. The most simple ECUs simply control the quantity of fuel injected into each cylinder each engine cycle. More advanced ECUs found on most modern cars also control the ignition timing, Variable Valve Timing (VVT), the level of boost maintained by the turbocharger (in turbocharged cars), and control other peripherals. ECUs determine the quantity of fuel, ignition timing and other parameters by monitoring the engine through sensors. These can include, MAP sensor, throttle position sensor, air temperature sensor, oxygen sensor and many others.Before ECUs most engine parameters were fixed. The quantity of fuel per cylinder per engine cycle was determined by a carburetor or injector pumpCommon Symptoms before ECU damaged (from http://www.carelect.demon.co.uk)1)Erratic idle/stall at traffic lights/general poor running and starting problems which can be intermittent.2) ONE injector ceasing to function.3) Nonsense fault codes when code reader is connected.4) Code reader will not communicate with the ECU.If you have any of these symptoms it is vital that the ECU is attended to IMMEDIATELY as ANY delay can result in total loss of ECU. STOP USING THE CARECU for 4G92 F-style model is black box MR507191..ISC- Idle Speed Control The Idle Speed Control (ISC) servo, located on the throttle chamber regulates and controls the idle for the loads placed on the engine.The ISC servo is a stepper motor that regulates the amount of air taken in through the bypass circuit of the intake manifold by opening and closing the servo valve located in the air passage. The ECU will supply voltage in one polarity direction, which will turn the motor in a particular rotation.The ECU uses several sensor inputs to determine the operating condition of the engine and the loads being placed on it. The ECU adjusts the idle for air conditioning and automatic transmission loads and controls fast idle for cold start. The ECU uses the idle speed control (ISC) servo to make all of the adjustments to the idle.With this many miles on it, it is probably gummed up. I would try cleaning the throttle body and the ISC Servo. That could very well cure the problem.TPS - Throttle position sensor from Wikipedia, the free encyclopediaThrottle body showing throttle position sensor on the rightA throttle position sensor (TPS) is a sensor used to monitor the position of the throttle in an internal combustion engine. The sensor is usually located on the butterfly spindle so that it can directly monitor the position of the butterfly throttle valve.The sensor is usually a potentiometer and therefore provides a variable resistance dependent upon the position of the butterfly valve (and hence throttle position). The sensor signal is used by the Engine Control Unit (ECU) as an input to its control system. The ignition timing and fuel injection timing (and potentially other parameters) are altered depending upon the position of the throttle, and also depending on the rate of change of that position. For example, in fuel injected engines, in order to avoid stalling, extra fuel may be injected if the throttle is opened rapidly (mimicking the accelerator pump of carburetor systems).Air flow meter From Wikipedia, the free encyclopediaAir flow meter number of 4G92 is 605An air flow meter, also know as air consumption meter, is a device that measures how much air is flowing through a tube. It does not measure the volume of the air passing through the tube, it measures the amount of mass flowing through the device in a defined time segment. So, an air flow meter is just an application of mass flow meters for a special medium.The typical physical value is kg/h.Air flow meter in cars An air flow meter is used in some cars to measure the quantity of air going to the engine. The electronic control unit then calculates how much fuel is needed to inject into the intake manifold.Oxygen sensor An automotive oxygen sensor, also known as an O2 sensor, lambda probe, lambda sensor, lambda sond or EGO (exhaust gas oxygen) sensor, is a small sensor inserted into the exhaust system of a petrol engine to measure the concentration of oxygen remaining in the exhaust gas to allow an electronic control unit (ECU) to control the efficiency of the combustion process in the engine. In most modern automobiles, these sensors are attached to the engine's exhaust manifold to determine whether the mixture of air and gasoline going into the engine is rich (too little oxygen) or lean (too much oxygen). manifold absolute pressure sensor (MAP) is one of the sensors used in an internal combustion engine's electronic control system. Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). This is necessary to calculate air density and determine the engine's air mass flow rate, which in turn is used to calculate the appropriate fuel flowAn engine control system that uses manifold absolute pressure to calculate air mass, is using the speed-density method. Engine speed (RPM) and air temperature are also necessary to complete the speed-density calculation. Not all fuel injected engines use a MAP sensor to infer mass air flow, some use a MAF sensor (mass air flow).
hope this info is useful for all ck4 user..will try to search more info about ck4 next time ..