Engine Performance Diagnostic Table

WARNING: This page is about a different variant/trim than selected.

CONDITION	POSSIBLE CAUSE	CORRECTION
ENGINE WILL NOT START	1. Weak battery.	1. Charge or replace as necessary.
	2. Corroded or loose battery connections.	2. Clean and tighten battery connections. Apply a coat of light mineral grease to the terminals.
	3. Faulty starter.	3. Refer to DIAGNOSIS AND TESTING - STARTING SYSTEM .
	4. Faulty camshaft position sensor.	4. Replace the Camshaft Position (CMP) sensor. Refer to ENGINE SENSORS, REMOVAL AND INSTALLATION .
	5. Faulty crankshaft position sensor.	5. Replace Crank Position (CKP) sensor. Refer to ENGINE SENSORS, REMOVAL AND INSTALLATION .
	6. Faulty fuel pump, relay or wiring.	6. Repair or replace as necessary.
	7. Dirt or water in fuel system.	7. Clean system and replace fuel filter.
ENGINE STALLS OR ROUGH IDLE	1. Vacuum leak.	1. Inspect intake manifold and vacuum hoses, repair or replace as necessary.
	2. Faulty crank position sensor.	2. Replace Crank Position (CKP) sensor. Refer to ENGINE SENSORS, REMOVAL AND INSTALLATION .
	3. Incorrect camshaft timing.	3. Refer to ENGINE TIMING VERIFICATION .
ENGINE LOSS OF POWER	1. Dirt or water in fuel system.	1. Clean system and replace fuel filter.
	2. Faulty fuel pump.	2. Replace the fuel pump
	3. Blown cylinder head gasket.	3. Replace the cylinder head gasket.
	4. Low compression.	4. Repair as necessary. Refer to CYLINDER COMPRESSION TEST .
	5. Burned, warped or pitted valves.	5. Replace as necessary.
	6. Plugged or restricted exhaust system.	6. Inspect and replace as necessary.
	7. Incorrect camshaft timing.	7. Refer to ENGINE TIMING VERIFICATION .
ENGINE MISSES ON ACCELERATION	1. Dirt in fuel system.	1. Clean fuel system.
ENGINE MISSES ON ACCELERATION	2. Burned, warped or pitted valves.	2. Replace as necessary.
ENGINE MISSES AT HIGH SPEED	1. Dirt or water in fuel system.	1. Clean system and replace fuel filter.