Cabriolet L4-1781cc 1.8L SOHC (JH) (1989)
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Fuel Injector: Testing and Inspection
Fig. 3 Tool VW 1348/1
1.
Connect remote control tool No. VW 1348/3A or equivalent, to disconnected electrical connector of control pressure regulator and battery positive
terminal (+).
2.
Attach analyzer tool No. US 4480 or equivalent, to bumper and secure with chain.
3.
Remove fuel injectors from cylinder head with fuel lines attached.
4.
Inspect injector seals for damage or loose fit and replace as necessary, check tightness of injector inserts using a 12 mm wrench.
5.
If inserts are loose, remove inserts and clean threads, apply Loctite 620 or equivalent, and torque to 16 ft. lbs.
6.
Install injectors with lines attached into analyzer. Ensure lines are not kinked or bent. If necessary, loosen fittings to properly locate fuel
lines, then retighten.
7.
Remove rubber boot from air flow sensor housing, then turn and lift adjusting screw 1 and slide 2 into upper position on tool No. VW 1348/1 or
equivalent, Fig. 3.
8.
Place tool No. VW 1348/1 centrally on edge of air flow sensor assembly, with pointer 3 facing center of fuel distributor.
9.
Push adjusting slide 2 down onto stop, turn setting screw 1 clockwise until magnetic end contacts air flow sensor plate retaining bolt.
10.
Turn remote control On, then turn adjusting screw 1 counterclockwise until beginning of fuel injection is seen at one injector.
11.
Turn remote control Off and empty analyzer into fuel tank.
12.
Lift adjusting slide 2 to first stop (simulated idle).
13.
Turn remote control On until fuel level on scale of one measuring glass reaches 20 ml.
14.
Observe injector spray pattern, must be even and cone shaped. All injectors should have same spray pattern.
15.
If injector spray pattern is not even and cone shaped, briefly lift sensor plate up once fully and repeat test.
16.
Compare amount of fuel for all injectors (keep measuring device level), maximum difference allowed is 3 ml.
17.
If fuel in flasks differs between high and low more than 3 ml, interchange those injectors and repeat test.
18.
If difference of injected fuel did not change with interchanged injectors, check fuel lines for kinks or obstructions and fuel distributor for defects.
19.
If difference of injected fuel did change with interchanged injectors, replace injectors.
20.
Empty analyzer into fuel tank, then reinstall injectors.
21.
Lift adjusting slide 2 to last stop (simulated full throttle).
22.
Turn remote control On until fuel level on scale of one measuring glass reaches 80 ml.
23.
Observe injector spray pattern, must be even and cone shaped. All injectors should have same spray pattern.
24.
If injector spray pattern is not even and cone shaped, briefly lift sensor plate up once fully and repeat test.
25.
Compare amount of fuel for all injectors (keep measuring device level), maximum difference allowed is 8 ml.
26.
If fuel in flasks differs between high and low more than 8 ml, interchange those injectors and repeat test.
27.
If difference of injected fuel did not change with interchanged injectors, check fuel lines for kinks or obstructions and fuel distributor for defects.
28.
If difference of injected fuel did change with interchanged injectors, replace injectors.
29.
Immediately after measuring, check injectors for leaks as follows:
a. Place sensor plate in rest position, then switch remote control On for approximately 2 minutes.
b. If injector(s) drip, replace injector(s).
