AUDI A4 1998 B5 / 1.G AFC Engine Fuel Injector Leak Testing And Delivery Quantity Checking Workshop Manual
Page 1 of 5
24-33
Fuel injector leak testing and
delivery quantity, checking
CAUTION!
Fire hazard! Do not smoke, work near heaters
or open flame, or have anything in the area
that could ignite fuel.
System pressure OK page 24
-20
- Remove intake air duct between Mass Air Flow
(MAF) sensor and sound dampener.
- Loosen ignition wires only as far as necessary to
remove fuel rail, and lay to one side.
- Disconnect fuel injector harness connectors.
- Disconnect fuel rail from intake manifold.
- Disconnect vacuum hose from fuel pressure regulator.
- Lift (and afterward support) fuel rail (complete with fuel injectors) from
intake manifold.
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Page 2 of 5
24-34
Checking fuel injector leakage
CAUTION!
Fire hazard! Do not smoke, work near heaters
or open flame, or have anything in the area
that could ignite fuel.
- Use scan tool "Output Diagnostic Test Mode"
function 03 to trigger fuel pump relay -J17-
Repair Group 01.
- Visually inspect fuel injector for leaks (with fuel
pump running).
Maximum: Two drops per minute per fuel
injector
If fuel loss exceeds 2 drops per minute:
- Switch ignition OFF and replace leaking fuel
injector.
Note:
Always replace O-rings!
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Page 3 of 5
24-35
Checking fuel injector delivery quantity
CAUTION!
Fire hazard! Do not smoke, work near heaters
or open flame, or have anything in the area
that could ignite fuel.
- Insert fuel injector to be tested into calibrated measuring container from
1602 fuel analyzer kit.
- Connect one terminal of each fuel injector being tested to engine
Ground (GND) using jumper wire from connector test kit VW 1594.
- Connect remaining fuel injector terminal to B+ using remote control
VAG 1348/3A, adapter wire VAG 1248/3-2 and jumper wire from
connector test kit VW 1594.
- Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel
pump relay -J17- Repair Group 01. - Operate remote control VAG 1348/3A for 30 seconds.
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CAUTION!
Fire Hazard. Do NOT smoke or have anything
in area that can ignite fuel.
- After each 30 second fuel injector fill, place
measuring container on level surface (to
facilitate accurate reading) and record fuel
quantity delivered.
Specified value (each fuel injector): 85-110 ml
(2.9-3.7 oz.)
If the measured quantity for one or more fuel
injectors is under or over the specified value:
- Replace faulty fuel injector(s).
If the measured values for all of the fuel injectors
(as a set) are under or over the specified values:
- Check system pressure page 24
-20
.
- Re-install fuel injectors in reverse order of
removal.
- Replace O-rings on all fuel injectors and lightly
coat with engine oil.
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Page 5 of 5
- Slide fuel injectors into correct position in fuel
rail and secure with retaining clips.
- Install fuel rail (complete with fuel injectors) into
intake manifold by pressing it evenly all around.
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