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Fuel hose to engine
Fuel inlet hose from fuel tank
Fuel filter with integrated fuel pressure regulator
Fuel return flow to fuel tank
Air admission line for diaphragm pressure regulator
Frame floor ahead of rear axle in fuel pump assembly or on the frame floor on left ahead of rear axle, suspended separately on rubber rings <--------- here it is. this is an 01 clk320
Exhaust Gas Recirculation (EGR) System
The exhaust gas recirculation (EGR) system is designed to:
reintroduce exhaust gas into the combustion cycle.
lower combustion temperatures.
reduce the formation of oxides or nitrogen (NOX).
The amount of exhaust gas reintroduced and the timing of the cycle varies by calibration. Timing and volume are controlled by the following:
exhaust system back pressure
engine coolant temperature
air charge temperature
The EGR valve (EGR valve) (9D475) is vacuum-actuated. The vacuum hose routing diagram is shown on the Vehicle Emission Control Information (VECI) decal.
The EGR system is a differential pressure feedback EGR Sensor system. Differential pressure feedback EGR Sensor is a subsonic closed loop EGR system. The differential pressure feedback EGR system:
monitors EGR flow rate by the pressure drop across the metering orifice located in the EGR tube.
uses a differential pressure feedback EGR sensor as the feedback device.
uses the EGR valve only as a pressure regulator, rather than a flow metering device.
controlled pressure is varied by the valve movement using vacuum output of the EGR vacuum regulator solenoid (9J459).
allows for a more accurate assessment of EGR flow requirements.
Differential Pressure Feedback EGR Flow Diagram
Differential Pressure Feedback EGR Sensor
Disconnect engine control sensor wiring (12A581) from Differential Pressure Feedback EGR Sensor.
Disconnect Differential Pressure Feedback EGR Sensor hoses from EGR valve to exhaust manifold tube (9D477).
Remove retaining nuts or bolts (depending upon application) and EGR Differential Pressure Feedback transducer.
Follow removal procedure in reverse order.
Tighten retaining nuts or bolts (depending upon application) to 5-7 Nm (45-61 lb-in).
BACK FIRING AND HARD STARTING COULD BE CAUSED BY LOW FUEL PRESSURE CAUSED BY WORN FUEL PUMP.STOP UP FUEL FILTER AND STOPPED UP FUEL INJECTORS.IF ALL IS GOOD LOOK FOR VACUUM LEAKS AT INTAKE HOSES AND INTAKE MANIFOLD.WORN VALVES WILL CAUSE MISSING AND BACKFIRING.
SOUND LIKE FUEL PUMP GOING BAD.BUT CHECK THE EVAP CHARCOAL CANISTER FILTER IF GAS SOAKED REPLACE IT REPLACE GAS CAP MAKE SURE GAS CAP IS THE PRESSURE VACUUM TYPE.ALSO CHECK VACUUM PURGE VALVE VACUUM HOSE TO CARBURETOR AND CHECK VACUUM HOSE TO CHARCOAL CANISTER FOR BLOCKAGE RESTRICTION OR BROKEN AND MISSING.
check that the map sensor vacuum hose is not leaking a leaking hose or a bad map sensor will cause the problem so will a bad cooant temp sensor. wireing to the above could be shorted or open.if a fuel injector were leaking or the controll wire to it were shorted to ground that also would cause it.if all the plugs were black when you changed them then look for an across the board problem like a sensor/vac hose/. if it had only one or two black plugs then look for grouned fuel injector wire or leaking injectors. one other possability could be a ruptured diaphram in the fuel pressure regulator. pull off vac hose and look for gas in the hose, start engine with hose off and see if gas comes out of the regulator if either have gas then replace regulator. oh forgot, that hose on the regulator has to have vacuum on it if it dont or hose leaks it will make fuel pressure to high and cause the problem. the exception to the vacuum at all times on the map censor and pressure regulator would be the 2.2/2.5l turbo. the vacuum to those censors is controlled with solonoids operated by the computer.
with engine off turn the key on/off/on/off/on and watch the check engine light it will start flashing the codes it will be like blink short pause then blink blink blink. that would be a code thirteen. if it has more than one code then after first it will blink out another always 2 digit codes if you miss count the blinks then turn off key for a minute and repeat. let me know what the codes are
Try replacing the fuel filter and locate the fuel pressure regulator it should be located on the top of the motor at the area where the beginning fuel rail is, ( the fuel rail feeds the fuel injectors) if you notice the the pressure regulators vacuum hose is broken replace also if the pressure regulator appears to be wet with gas replace it. The fuel pump may be bad check for appropriate pressure at access valve on fuel rail it should be a minimum of 30 psi fuel pressure.
I think it's possible that the fuel regulator is stuck open and allowing the fuel to return to the gas tank. If your car is like mine (1991 Acura 1.8 engine), you can try this experiment: Pull the vacuum line off the fuel regulator (it's on the end of the fuel injector manifold and a hose connects to it to return gas back to the gas tank) and temporary plug the hose with a small bolt or golf tee. If the regulator is not stuck open it will make the fuel injector manifold at the highest pressure. Start the car and see if it dies or keeps running ok. If it runs ok then the vacuum control is not working right. If this doesn't help, try changing the fuel regulator valve or pull it out and test it with a vacuum off and on. When the vacuum pressure is present to the valve the valve is suppose to open slightly, this allows fuel to bypass the fuel rail and return to the tank.