Sonata GL V6-2.5L (1999)
1. Disconnect the vacuum hose from the intake manifold purge hose nipple and connect a hand vacuum pump to the nipple.
Purge Port Vacuum Curve
2. Start the engine and check that, after raising the engine speed by racing the engine, vacuum remains fairly constant.
NOTE: If there is no vacuum created, it is possible that the intake manifold port may be clogged and require cleaning.
