Difficult Or No Start (Cranks Okay): Aerio

Faulty spark plugs. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
Faulty ignition coil. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
Idle air control system. See B-5: IDLE AIR CONTROL VALVE SYSTEM CHECK under CIRCUIT TESTS in BASIC DIAGNOSTIC PROCEDURES article.
Faulty ECT sensor. See ECT sensor related DTCs in appropriate SELF DIAGNOSTICS article.
Faulty TP sensor. See TP sensor related DTCs in appropriate SELF DIAGNOSTICS article.
Faulty MAF sensor. See MAF sensor related DTCs in appropriate SELF DIAGNOSTICS article.
Faulty fuel injector(s). See B-1: FUEL INJECTOR CIRCUIT INSPECTION under CIRCUIT TESTS in BASIC DIAGNOSTIC PROCEDURES article.
Fuel pressure out of specification. See FUEL PRESSURE under FUEL SYSTEM in SYSTEM & COMPONENT TESTING article.
Faulty Crankshaft Position (CKP) sensor. See CKP sensor related DTCs in appropriate SELF DIAGNOSTICS article.
Check for low engine compression. See MECHANICAL INSPECTION in BASIC DIAGNOSTIC PROCEDURES article.
Faulty PCV system. See POSITIVE CRANKCASE VENTILATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article.