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For an engine to run, timing must be correct, engine compression must be sufficient, you must have ignition spark to the plugs, and there has to be fuel to the engine. With that, here are links that show how to test for each one. The last two things I attach will be specific information related to testing on your vehicle. The attached pictures correlate with the specifics.
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https://www.2carpros.com/articles/car-cranks-but-wont-start
https://www.2carpros.com/articles/how-to-test-engine-compression
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
https://www.2carpros.com/articles/how-to-test-a-fuel-injector
https://www.2carpros.com/articles/how-to-test-an-ignition-system
________________________________ Here are the specifics for fuel pressure and compression
COMPONENT TESTS AND GENERAL DIAGNOSTICS
Checking Compression Of All Cylinders
- Read out fault memory of DME control unit
- Check stored faults
- Rectify faults
- Clear fault memory
Disconnect fuel pump relay or fuel pump fuse.
Start engine and allow remaining fuel to escape.
This prevents fuel from being injected, the catalytic converter from being damaged and the test result from being distorted during the compression pressure check.
Caution: High voltage - mortal danger!
Disconnect all supply leads from ignition coils (interrupt power supply to ignition coils).
picture 1
Remove all spark plugs See: Spark Plug > Service and Repair
Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.
Note: Check that seal is in perfect condition.
picture 2
Depress accelerator and actuate starter until compression stops rising.
Compression pressure See: Compression Check > Pressure, Vacuum and Temperature
Now clear the fault memory.
Compression specs:
Compression pressure (approx. equal value for all cylinders) mininimum 12 - 14 bar
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13 31 029 CHECKING FUEL PUMP DELIVERY PRESSURE
Checking Fuel Pump Delivery Pressure (M54)
Special tools required:
13 3 010
13 5 220
61 3 050
Switch off ignition.
CAUTION:
The fuel in the fuel lines is under pressure (approx. 3 bar).
Catch and dispose of escaping fuel.
Remove cover from fuel injectors.
picture 3
Remove dust cap (1) from measuring valve on fuel rail.
picture 4
Prepare special took kit 13 5 220 (consisting of 13 5 221 and 13 5 222).
picture 5
Unscrew check valve (1) on special tool kit 13 5 220.
Fit special tool kit 13 5 220 on measuring valve and tighten knurled nut until hand-tight.
Start engine.
Screw in check valve (1) until a pressure reading is indicated on DIS Tester.
CAUTION: Do not under any circumstances screw in the check valve up to the mechanical stop. This could damage the valve in the pressure regulator housing.
Measuring fuel pressure:
Connect pressure sensor to DIS Tester
Start engine.
Select Measurement.
Multimeter function appears
Select Pressure test
Read off fuel pressure
Compare actual value of test pressure with specified value.
Switch off engine.
Checking fuel pump:
Detach fuel pump relay.
NOTE: Check whether fuel pump no longer starts up during engine starting procedure (engine fails to start).
picture 6
Connect special tool 61 3 050 to terminal (87) and terminal (30).
Press button and read off fuel pump delivery pressure on DIS Tester.
Compare actual value with specified value of delivery pressure.
picture 7
Keep special tool 13 3 010 ready for further tests.
Further tests are described in the section "Fuel pressure check".
NOTE:
Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.
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Do these tests to determine what the cause of the no start is. Let me know the results.
Joe
Images (Click to make bigger)
Thursday, May 9th, 2019 AT 6:36 PM
