Code 28

Code 28 - AIR LEAK - Check for air leaks in the following areas:
- Hose, air flow meter to plenum
- Breather system hoses to plenum
- Brake servo hose
- Vacuum reservoir hose (fresh air solenoid)
- Distributor vacuum advance
- Hose, purge valve to plenum Injector seals
- By pass air valve hose

Check the following joints:
- By pass air valve to plenum
- Plenum chamber to ram housing
- Ram housing to inlet manifold
- Inlet manifold to cylinder head