Lack/Loss of Power on Acceleration or Cruise

SYMPTOM DESCRIPTION:

Engine delivers less than expected power. Little or no increase in speed, when accelerator is pushed down part way.




SYSTEM OR COMPONENT TO CHECK ACTION

COMPUTER INPUTS/OUTPUTS CHECK: ^ Electronic control unit grounds for electrical
integrity.
^ AIR FLOW METER: Stuck or sluggish flap.
^ OXYGEN SENSOR
^ ELECTRONIC CONTROL UNIT: Check control unit
and PROM I. D.


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





IGNITION CHECK: ^ Proper ignition voltage output.








EXHAUST CHECK: ^ 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 CHECK: ^ 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: