Mechanics

LOW POWER AT OPERATING TEMP.

1996 Saturn SC2

Engine Performance problem
1996 Saturn SC2 4 cyl Front Wheel Drive Manual 174000 miles

my twin cam 1.9 runs great when the engine is cold when it gets to operating temp. It has low power. I have replaced the throttle position sensor, O2 sensors, and the cat. And the fuel filter, spark plugs and wires. I am running out of ideas.
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Bustermaxa
March 19, 2010.



Lack of acceleration, chugging, hesitating, bogging etc. Could be caused by one of the following below.

Inspect and test all the following listed below and get back with some results

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note: If it doesn't apply disregard.

Rasmataz
Mar 20, 2010.