Excessive Air System Noise, (Putt-Putt, Whirring Or Hissing)

CONDITION
^ Excessive AIR system noise (putt-putt, whirring or hissing)

POSSIBLE SOURCE
^ Leak in hose.
- Locate source of leak using soap solution and replace hoses as necessary.

^ Loose, pinched or kinked hose.
- Reassemble, straighten or replace hose and clamps as required.

^ Hose touching other engine parts.
- Adjust hose to prevent contact with other engine parts.

^ AIRB valve inoperative.
- Test the valve. Go to pinpoint test step AIR7. AIR7 - Check For Vacuum at the AIRB Valve

^ Check valve inoperative.
- Test the valve. Go to pinpoint test step AIR33. AIR33 - Check Air Flow at Check Valve

^ Restricted or bent pump outlet fitting.
- Inspect fitting and remove any flash blocking the air passage way. Replace bent fittings.

^ Air dumping through AIRB valve (at idle only).
- On many vehicles, the AIR system has been designed to dump air at idle to prevent overheating the catalyst. This condition is normal. Determine that the noise persists at higher speeds before proceeding.

^ Air dumping through AIRB valve (decel and cruise).
- On many vehicles, secondary air is dumped in the air cleaner or in remote silencer. Make sure hoses are connected and not cracked.

^ AIR pump resonator leaking or blocked.
- Check resonator for hole or restricted inlet/outlet tubes. Go to pinpoint test step AIR6. AIR6 - Check Air Pump Resonator