Check for a clogged air filter.
Check exhaust system for restrictions, such as a damaged or collapsed pipe, muffler or catalytic converter. See EXHAUST SYSTEM BACKPRESSURE under MECHANICAL INSPECTION in appropriate BASIC DIAGNOSTIC PROCEDURES article.
Check engine compression.
Check transmission shift pattern and downshift operation.
Check TCC system for proper operation.
Check for dragging brakes.
Check cooling system thermostat for proper heat range and operation.
Ensure initial ignition timing is properly set. Check EST and ESC for proper operation.
Remove spark plugs and check for wet/fouled spark plugs, cracks, improper gap, burned electrodes or heavy carbon deposits.
Check for excessively high fuel pressure.
Check for fuel pressure regulator leaking into intake manifold.
Check ECT sensor for shift in calibration. See ECT, DFT & IAT SENSOR RESISTANCE VALUES table in appropriate SENSOR OPERATING RANGE CHARTS article.
Check oxygen sensor for silicone or lead contamination.
Ensure speedometer is properly calibrated.
Ensure A/C system is not always on.
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Tuesday, April 6th, 2010 AT 5:00 AM