Search of malfunctions of system of injection of fuel. BMW the 5th E28/E34 series (from 1981 to 1993 of release)
Repair of BMW E28 and series E34 from 1981 to 1993
1. Cars of the BMW brand of 5-series
2. Engine
3. Cooling system
4. Power supply system
4.1. General information
4.2. Pressure removal in system of injection of fuel
4.3. Check of pressure of fuel / fuel pump
4.4. Removal and installation of the fuel pump, intermediate pump and fuel level sensor
4.5. Repair and replacement of fuel lines and connectors
4.6. Removal and installation of a fuel tank
4.7. General information about cleaning and repair of a fuel tank
4.8. Removal and air purifier installation
4.9. Check, adjustment and replacement of a cable of an accelerator
4.10. General information about the carburetor
4.11. Removal and carburetor installation
4.12. Cleaning and carburetor adjustment
4.13. General information about fuel injection
4.14. Systems of injection of fuel
4.15. Check of functioning of system of injection of fuel
4.16. Functioning check, removal and installation of a measuring instrument of a stream of air
4.17. Functioning check, removal and installation of the case of a throttle
4.18. Check of functioning and replacement of a regulator of pressure of fuel
4.19. Check of functioning and replacement of an injector of cold start and temperature switch
4.20. Check of functioning and replacement of fuel injectors
4.21. Functioning check, adjustment and replacement of the air valve of stabilization of idling
4.22. Search of malfunctions of system of injection of fuel
4.23. Diagnostics of malfunctions of a power supply system
5. Ignition system
6. Control systems of the engine and decrease in toxicity of the fulfilled gases
7. System of production of the fulfilled gases
8. Coupling
9. Manual box of gear shifting (RKPP) and automatic transmission (AT)
10. Transmission line
11. Steering and suspension bracket
12. Brake system
13. Body
14. Control body sizes
15. Heater and air conditioner
16. System of onboard electric equipment
17. Routine maintenance of the car
18. Size table and adjusting data
19. Schematic electric circuits
20. Governing bodies and operation receptions
21. System of onboard diagnostics - a principle of functioning and codes of malfunctions
 








4-22-poisk-neispravnostejj-sistemy-vpryska-topliva.html

4.22. Search of malfunctions of system of injection of fuel

System of injection of L-Jetronic fuel

Malfunction Possible reason Way of elimination
The engine (cold) is got hardly or not got The injector of cold start or the temperature switch is faulty Check an injector of cold start and the temperature switch. Replace faulty components (look the Section Check of functioning and replacement of an injector of cold start and the temperature switch)
The fuel pump does not work Check a safety lock of the fuel pump and the relay of the fuel pump (look Sections Check of pressure of fuel / the fuel pump and Removal and installation of the fuel pump, the intermediate pump and the fuel level sensor)
Jams or залипает in open situation a petal (valve) of a measuring instrument of a stream of air Examine a measuring instrument of a stream of air about damages (look the Section functioning Check, removal and installation of a measuring instrument of a stream of air)
Wrong pressure of fuel Check pressure in system (look the Section Check of pressure of fuel / the fuel pump). Check a regulator of pressure of fuel (The section Check of functioning and replacement of a regulator of pressure of fuel)
Leakages of inlet air Examine all vacuum lines, air lines, epiploons of the oil filter and masloizmeritelny щупа
Fuel injectors are corked or do not work Check fuel injectors (look the Section Check of functioning and replacement of fuel injectors) and a cable
The sensor of temperature of a cooler or problem with wires is faulty Check the sensor of temperature of a cooler (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, the Section Check of pressure of fuel / the fuel pump)
The sensor of provision of a throttle (TPS) is incorrectly adjusted Check TPS adjustment (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
Wrong moment of ignition Check the ignition moment (look Head ignition System). Check the vacuum proof-reader of ignition
Dirt or other inclusions in fuel Check fuel and, if necessary, merge fuel from a tank
ECU is faulty Check ECU at the dealer or other expert
The engine (heated-up) is got hardly or not got Leak in an injector of cold start or constantly open condition Check an injector of cold start and the temperature switch (look the Section Check of functioning and replacement of an injector of cold start and the temperature switch)
Wrong pressure of fuel Check the fuel pump (ы). If necessary replace (look the Section Check of pressure of fuel / the fuel pump)
Insignificant residual pressure of fuel Check residual pressure of fuel. Replace if necessary the fuel pump or the fuel accumulator (look the Section Check of functioning and replacement of a regulator of pressure of fuel)
Leak (утески) fuels Examine about leaks fuel lines and fuel injectors. Eliminate leaks as it is specified (look Head the Power supply system)
The sensor of temperature of a cooler or problem with wires is faulty Check the sensor of temperature of a cooler (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
Gas stopper in топливопроводе (hot weather) Check pressure of fuel (look the Section Check of pressure of fuel / the fuel pump)
Malfunction of EVAP system (if it is applied) Check EVAP system (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, the Section catching System паров gasoline (EVAP))
Wrong moment of ignition Check the ignition moment (look Head ignition System). Check a vacuum regulator of ignition
ECU is faulty Check ECU at the dealer or other expert
Malfunction of the monitoring system of idling Check the air valve of stabilization of idling (look the Section functioning Check, adjustment and replacement of the air valve of stabilization of idling)
The engine under loading glitches and twitches The fuel injector is corked or faulty Check fuel injectors. Check existence of the corked fuel lines. Replace faulty injectors (look the Section Check of functioning and replacement of fuel injectors)
Wrong pressure of fuel Check pressure in fuel system (look the Section Check of pressure of fuel / the fuel pump). Check a regulator of pressure of fuel (look the Section Check of functioning and replacement of a regulator of pressure of fuel)
Leakage (leakages) of fuel Check existence of leaks in fuel lines and fuel injectors (look Head the Power supply system)
Engine service Adjust the engine (look Head Routine maintenance of the car). Check a cover of the distributor of ignition, a begunok, high-voltage wires and spark plugs and replace any faulty components
Jams or залипает in open situation a petal (valve) of a measuring instrument of a stream of air Examine about damage a measuring instrument of a stream of air (look the Section functioning Check, removal and installation of a measuring instrument of a stream of air)
Leakage of inlet air Examine all vacuum lines, air lines, epiploons of the oil filter and masloizmeritelny щупа
The engine has unstable turns of idling The air valve of stabilization of idling is faulty Check the air valve of stabilization of idling (look the Section functioning Check, adjustment and replacement of the air valve of stabilization of idling)
There is no food of the valve of stabilization of idling Check the relay of the stabilizer of idling and a wire (look Head System of onboard electric equipment)
The vacuum regulator of ignition is faulty Check a vacuum regulator of ignition and the electronic relay of a vacuum regulator of ignition
The block of control of idling is faulty Check at the dealer the block of control of idling

Fuel system of injection of Motronic

In this system in default ECU stores a malfunction code in memory. These codes can be read only at the dealer of BMW as the special equipment is required. If the dealer executes, at least, initial diagnostics of malfunctions, it will allow to save time.


Malfunction Possible reason Way of elimination
Capacity loss The sensor of temperature of a cooler or wire break to the sensor is faulty Check the sensor of temperature of a cooler and a wire. Correct a wire or replace the sensor if it is faulty (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases)
Wrong pressure of fuel Check pressure of fuel in the fuel pump and the intermediate pump if it is applied (look the Section Check of pressure of fuel / the fuel pump)
The valve of a throttle opens not completely Check adjustment of a cable of an accelerator to be convinced of complete opening of the valve of a throttle.
Adjust a cable if it is necessary (look the Section Check, adjustment and replacement of a cable of an accelerator)
The engine (cold) is started hardly or not started The injector of cold start or the temperature switch (only on early systems Motronic) is faulty Check an injector of cold start and the temperature switch. Replace faulty components (look the Section Check of functioning and replacement of an injector of cold start and the temperature switch)
The fuel pump does not work Check a safety lock and the relay of the fuel pump (look the Section pressure Removal in system of injection of fuel and Check of pressure of fuel / the fuel pump)
Jams or залипает in open situation a petal (valve) of a measuring instrument of a stream of air Examine about damage a measuring instrument of a stream of air (look the Section functioning Check, removal and installation of a measuring instrument of a stream of air)
Wrong pressure of fuel Check pressure in system (look the Section Check of pressure of fuel / the fuel pump)
Leakages of inlet air Examine all vacuum lines, air lines, epiploons of the oil filter and masloizmeritelny щупа
Fuel injectors are corked or do not work Check fuel injectors (look the Section Check of functioning and replacement of fuel injectors) and a cable
The sensor of temperature of a cooler or problem with wires is faulty Check the sensor of temperature of a cooler (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
TPS (the sensor of provision of a throttle) is incorrectly adjusted Check TPS adjustment (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
Dirt or other inclusions in fuel Check fuel and, if necessary, merge it from a tank
ECU is faulty Check ECU at the dealer or other expert
The signal of provision of a cranked shaft vanishes The sensor of situation or flywheel is faulty, or the reperny pin is not lost
The engine (heated-up) is started hardly or not started The injector of cold start (only on early systems Motronic) proceeds or is constantly open Check an injector of cold start and the temperature switch (look the Section Check of functioning and replacement of an injector of cold start and the temperature switch)
Wrong pressure of fuel Check pressure of fuel (look the Section Check of pressure of fuel / the fuel pump)
Insignificant residual pressure of fuel Check residual pressure of fuel system (look the Section Check of pressure of fuel / the fuel pump)
Leak (and) fuels Examine fuel lines and injectors about leaks. If necessary, eliminate leaks
The sensor of temperature of a cooler or problem with wires is faulty Check the sensor of temperature of a cooler (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
Gas stopper in a gasoline pipe line (hot weather) Check pressure of fuel (look the Section Check of pressure of fuel / the fuel pump)
The EVAP system is faulty Check EVAP system (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, the Section catching System паров gasoline (EVAP))
The idling monitoring system is faulty Check ECU at the dealer or other expert
The oxygen sensor (where it is applied) is faulty Check the air valve of stabilization of idling (look the Section functioning Check, adjustment and replacement of the air valve of stabilization of idling)
Check the oxygen sensor (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
The engine under loading glitches and twitches The fuel injector is corked Check fuel injectors. Check passableness of lines of injectors. Replace faulty injectors (look the Section Check of functioning and replacement of fuel injectors)
Wrong pressure of fuel Check pressure of fuel system (look the Section Check of pressure of fuel / the fuel pump). Check a regulator of pressure of fuel (look the Section Check of functioning and replacement of a regulator of pressure of fuel)
Leak (and) fuels Check on existence of leaks fuel lines and injectors (look Head the Power supply system)
Engine service Adjust the engine (look Head Routine maintenance of the car). Check a distributor cover, a begunok, high-voltage wires and spark plugs and replace all faulty components
Jams or залипает in open situation a petal (valve) of a measuring instrument of a stream of air Examine on existence of damage of a measuring instrument of a stream of air (look the Section functioning Check, removal and installation of a measuring instrument of a stream of air)
Leakages of inlet air Examine all vacuum lines, air lines, epiploons of the oil filter and masloizmeritelny щупа
The sensor of provision of a throttle (TPS) is incorrectly adjusted Check TPS adjustment (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases)
The raised turns of idling of the engine Jams an accelerator pedal, a cable or the throttle valve Check existence of the worn-out or broken components, the overwound cable or other damages. Replace faulty components
Leakage of air in the throttle valve Examine the valve of a throttle and adjust or, if necessary, replace
Unstable turns of idling of the engine The air valve of stabilization of idling is faulty Check the air valve of stabilization of idling (look the Section functioning Check, adjustment and replacement of the air valve of stabilization of idling)
There is no food of the valve of stabilization of idling Check the relay of the stabilizer of idling and a wire (look Head System of onboard electric equipment)
The block of control of idling is faulty Check at the dealer the block of control of idling
The increased fuel consumption The injector of cold start (only early systems Motronic) proceeds Check and, if necessary, replace an injector of cold start (look the Section Check of functioning and replacement of an injector of cold start and the temperature switch)
The oxygen sensor (where it is applied) is faulty Check the oxygen sensor (look Head of the Control system of the engine and decrease in toxicity of the fulfilled gases, Undressed Information sensors)
Jams lay brakes/brakes brake Check a lay brake / brake systems (look Head Brake system)
Low pressure in tires Check pressure in tires


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4.21. Functioning check, adjustment and replacement of the air valve of stabilization of idling
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4.23. Diagnostics of malfunctions of a power supply system