GM Service Manual Online
For 1990-2009 cars only

Checks

Actions

Leakage of Engine Oil

  • Loosened oil drain plug

Tighten the plug.

  • Loosened oil pan bolt

Tighten the bolt.

  • Loosened oil filter

Tighten the filter.

  • Loosened oil pressure switch

Tighten the switch.

  • Leakage of camshaft front oil seal

Replace the seal.

  • Leakage of crankshaft front oil seal

Replace the seal.

  • Leakage at the cylinder head cover gasket

Replace the gasket.

  • Damage of the cylinder head gasket

Replace the gasket.

Oil Mixing in Combustion Chamber

  • Stuck piston ring

Remove carbon and replace the ring.

  • Worn piston or cylinder

Replace the piston or the cylinder.

  • Worn piston ring or ring groove

Replace the piston or ring.

  • Inadequate position of the piston ring cutting part

Adjust the position.

  • Abrasion or damage of the valve system

Replace the valve stem.