AUDI A4 1996 B5 / 1.G AHA Engine Intake Manifold Tuning System User Guide
Page 11 of 11
24-163
If vacuum solenoid releases, check solenoid as
follows:
- Remove vacuum line from vacuum solenoid for
intake manifold change-over.
- Connect VAG1390 hand pump to vacuum
solenoid.
- Activate VAG1390 hand pump and watch
change-over process.
- Check vacuum solenoid for leaks.
Vacuum solenoid should not return to initial
position as long as vacuum is being applied by
hand pump.
If vacuum solenoid returns:
- Replace vacuum solenoid.
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