Check air leakage

Visually and physically inspect for air and vacuum leaks in the areas listed below.

1. Vacuum hoses for splits, kinks and improper connections.
2. Throttle body gasket.
3. Gasket between intake manifold and cylinder head.
4. Seals between intake manifold and fuel injectors.
5. Exhaust system between HO2S and three way catalyst for air leakage.

   Good 

   • Go to "ENGINE COMPRESSION TEST " procedure.

   No Good 

   • Repair or replace as necessary and Go to "VERIFICATION OF REPAIR " procedure.