Code 28: Engine Air Leak Fault

Check for air leaks in following areas:

• Hose, mass airflow sensor 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 to plenum.
• Plenum chamber to ram housing.
• Ram housing to inlet manifold.
• Inlet manifold to cylinder head.
• Bypass air valve hose.