Lack of Power/Sluggish/Spongy

SYMPTOM DESCRIPTION:
Engine delivers less than expected power. Little or no increase in speed when accelerator is pushed down part way. Check the following systems.



COMPUTER INPUTS/OUTPUTS
^ EFI control unit grounds for electrical integrity.
^ AIR FLOW METER: Stuck or sluggish flap.
^ OXYGEN SENSOR:



FUEL
^ FUEL PRESSURE: Check delivery pressure and volume output.
^ FUEL INJECTORS: Check spray pattern, clogged or stuck.
^ CONTAMINATED FUEL:
^ RESTRICTED FUEL FILTER:




IGNITION
^ Proper ignition voltage output.



EXHAUST
^ RESTRICTION:
1. With engine at normal operating temperature, connect a vacuum gauge to any convenient vacuum port on intake manifold.
2. Run engine at 1000 rpm and record vacuum reading.
3. Increase rpm slowly to 2500 rpm. Note vacuum reading at a steady 2500 rpm.
4. If vacuum at 2500 rpm decreases more than 3" Hg, from reading at 1000 rpm, the exhaust system should be inspected for restrictions.
5. Disconnect exhaust pipe from engine and repeat Step 3 & 4. If vacuum still drops more than 3" Hg, with exhaust disconnected, check for exhaust manifold restriction and valve timing



ENGINE/TRANSMISSION
^ BATTERY VOLTAGE: Check battery voltage and alternator output.
^ A/C operation.
^ ENGINE COMPRESSION;
^ ENGINE VALVE TIMING:
^ ENGINE CAMSHAFT for wear and proper application.
^ TORQUE CONVERTER CLUTCH: Check operation.
^ TRANSMISSION SHIFT POINTS: