DR-40A No Fault Code Mechanical Test

Vacuum Gauge Readings:

At this point in the driveability diagnosis, you have determined that all of the engine control systems are operating properly and are not the cause of the problem. The following items should be checked as possible mechanical causes of the problem:

ENGINE VACUUM Engine vacuum should be at least 13 in Hg in neutral.
ENGINE VALVE TIMING Engine valve timing should be at manufacturer`s specifications.
ENGINE COMPRESSION Engine compression should match manufacturer's specifications.
ENGINE EXHAUST SYSTEM The engine exhaust system must be free of any restrictions.
ENGINE PCV SYSTEM Ventilation air in the PCV system must flow freely.
ENGINE DRIVE SPROCKETS Cam and crankshaft sprockets must not have excessive wear.
TORQUE CONVERTER STALL SPEED Torque converter stall speed should be within manufacturer`s specifications.
POWER BRAKE BOOSTER The power brake booster should not have any internal vacuum leaks.
FUEL CONTAMINATION Check the fuel system for high alcohol and/or water contents.
FUEL INJECTOR Check the injectors for proper wire routing, and for proper injector operation.