Engine Performance Diagnostic Table

WARNING: This page is about a different car, the 2015 RAM 3500 HD and 2015 RAM 2500 HD. 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 DIAGNOSIS AND TESTING .
	4. Faulty camshaft position sensor.	4. Replace the camshaft position sensor. Refer to SENSOR, CAMSHAFT POSITION, REMOVAL .
	5. Faulty crankshaft position sensor	5. Replace crank position sensor. Refer to SENSOR, CRANKSHAFT POSITION, REMOVAL .
	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 sensor. Refer to SENSOR, CRANKSHAFT POSITION, REMOVAL .
	3. Incorrect camshaft timing.	3. Refer to VALVE TIMING, STANDARD PROCEDURE, 6.7L .
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 cylinder head gasket.
	4. Low compression.	4. repair as necessary. Refer to ENGINE, DIAGNOSIS AND TESTING .
	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 VALVE TIMING, STANDARD PROCEDURE, 6.7L .
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.