Diagnosis And Testing - Engine Diagnosis - Performance

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

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 ELECTRICAL/STARTING - DIAGNOSIS AND TESTING) .
	4. Incorrect spark plug gap.	4. Refer to PLUG-SPARK .
	5. Dirt or water in fuel system.	5. Clean system and replace fuel filter.
	6. Faulty fuel pump, relay or wiring.	6. Refer to DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - INTRODUCTION .
ENGINE STALLS OR ROUGH IDLE	1. Idle speed set to low.	1. Refer to DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - INTRODUCTION .
	2. Vacuum leak.	2. Inspect intake manifold and vacuum hoses, repair or replace as necessary.
	3. Incorrect engine timing.	3. Check ignition timing and diagnosis as necessary.
ENGINE LOSS OF POWER	1. Dirty or incorrectly gapped spark plugs.	1. Replace spark plugs.
	2. Dirt or water in fuel system.	2. Clean system and replace fuel filter.
	3. Blown cylinder head gasket.	3. Replace cylinder head gasket.
	4. Low compression.	4. Refer to DIAGNOSIS AND TESTING - CYLINDER COMPRESSION PRESSURE .
	5. Burned, warped or pitted valves.	5. Replace as necessary.
	6. Plugged or restricted exhaust system.	6. Inspect and replace as necessary.