Lack Of Power, Sluggish Or Spongy

If engine delivers less power than expected, or if there is little or no increase in speed when accelerator pedal is depressed, check the following items:

• A/C clutch disengages at full throttle (Metro and Tracker).
• Check throttle cable adjustment.
• Verify air intake or exhaust system is not restricted.
• Check for contaminated fuel.
• Check fuel pressure.
• Check in-line fuel filter and replace if dirty or clogged.
• Ensure sufficient secondary spark exists.
• Ensure ignition timing and controls are working properly.
• Check ECM ground connections.
• Check EGR valve and solenoid operation.
• Determine if condition is caused by a rich or lean system. Using Tech 1, measure O2S/HO2S output voltage while driving vehicle when condition exists. Voltage less than .45 volt, indicates a lean system. Voltage greater than .45 volt, indicates a rich system.
• Check O2S/HO2S operation and for RTV sealant or silicone contamination. Also check for sensor cracking or glycol contamination. This will cause a false high voltage signal to ECM. ECM will respond by reducing (leaner) air/fuel ratio.
• Check charging system output. Repair charging system if voltage is not 12-16 volts.
• Check Torque Converter Clutch (TCC) operation.
• Check for faulty spark plugs.
• Check for defective spark plug wires.
• Ensure valve timing and engine compression are okay.
• Check for worn camshaft.