Injection Quantity Comparative Measurement
WARNING: Fire Hazard! Do not smoke or have anything in area that can ignite fuel.
Requirement
- fuse 18 OK
Remote control VAG 1348/3A, connecting
- remove- fuel pump relay (J 17) from fuse/relay panel, location 12
- attach VAG 1348/3-2 adaptor wire connector to terminal 4 of fuel pump relay socket in location 12
- connect alligator clip for remote control VAG 1348/3A to battery positive (+)
- carefully pull fuel injectors out of their inserts and place complete set into openings of VAG 1348/26 fuel analyzer
- ensure that fuel lines are routed smoothly and without kinks
- turn and lift adjusting screw 1, slide 2 and knurled nut 4 of sensor plate positioning tool VAG 1348/1A to upper position
- place tool centrally on edge of air flow sensor with point 3 of tool facing fuel distributor
- hold air flow sensor plate in rest position by hand
- push slide 2 in to stop
- turn adjusting screw 1 in until magnetic tip contacts sensor plate mounting bolt
- operate remote control and turn adjusting screw 1 out far enough so that start of spray becomes visible at one of the injectors
- switch off remote control and empty analyzer
- fuel injectors remain inserted in analyzer
Idle position, fuel Injection, quantity measuring
- pull slide 2 of VAG 1348/1A to first stop (idle simulation)
- observe spray pattern of injectors, during following step
- spray pattern must be the same for all injectors
- If spray pattern for one injector is different: lift sensor plate up once briefly and repeat test
- operate remote control until 20 ml fuel accumulates in one of the tubes
- compare fuel quantities of injectors with each other while holding analyzer level
- maximum permissible deviation between all injectors: 2.0 ml
If fuel quantity between highest and lowest reading differs more than 2.0 ml
- interchange those two injectors and repeat test
If difference in quantity changes between the interchanged injectors
- replace those injectors
If injection quantity remains the same after interchanging injectors
- check if fuel line is pinched or if fuel distributor is defective, repair or replace as necessary
Full throttle position, fuel Injection quantity measurement
- empty VAG 1348/2 fuel analyzer
- fuel injectors remain inserted in analyzer
- pull slide 2 of VAG 1348/1A to second stop (full throttle simulation)
- observe spray pattern of injectors during following step
- spray pattern must be the same for all injectors
- If spray pattern for one injector is different; lift sensor plate up once briefly and repeat test
- operate remote control until 8.0 ml fuel is obtained in one of the tubes
- compare fuel quantities of injectors with each other while holding analyzer level
- maximum permissible deviation between all injectors: 8.0 ml
If fuel quantity between highest and lowest reading differs more than 8.0 ml
- Interchange those two injectors and repeat test If difference in quantity changes between the interchanged injectors
- replace those injectors
If injection quantity remains the same after, interchanging injectors
- check if fuel line is pinched or if fuel distributor is defective, repair or replace as necessary
Leak checking
- place air flow sensor plate at rest position
- operate remote control for approx. 2 minutes
- fuel injectors must not drip