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Diagnosis And Testing - Engine Diagnosis - Performance

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE

CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START
  1. Weak battery
  2. Corroded or loose battery connections.
  3. Faulty starter.
  4. Faulty coil or control unit.
  5. Incorrect spark plug gap.
  6. Incorrect right bank cam timing.
  7. Dirt or water in fuel system.
  8. Faulty fuel pump, relay or wiring.
  9. Faulty cam or crank sensor
  1. Charge or replace as necessary.
  2. Clean and tighten battery connections. Apply a coat of light mineral grease to the terminals.
  3. (Refer to STARTERS ).
  4. (Refer to IGNITION COIL ).
  5. (Refer to CLEANING ).
  6. Refer to VALVE TIMING  .
  7. Clean system and replace fuel filter.
  8. Repair or replace as necessary.
  9. Refer to IGNITION CONTROL .
ENGINE STALLS OR ROUGH IDLE
  1. Vacuum leak.
  2. Faulty crank position sensor
  3. Faulty coil.
  4. Incorrect cam timing.
  1. Inspect intake manifold and vacuum hoses, repair or replace as necessary.
  2. Replace crank position sensor
  3. (Refer to IGNITION COIL )
  4. (Refer to STANDARD PROCEDURE  )
1. ENGINE LOSS OF POWER
  1. Dirty or incorrectly gapped spark plugs.
  2. Dirt or water in fuel system.
  3. Faulty fuel pump.
  4. Blown cylinder head gasket.
  5. Low compression.
  6. Burned, warped or pitted valves.
  7. Plugged or restricted exhaust system.
  8. Faulty coil.
  9. Incorrect cam timing.
  1. (Refer to CLEANING ).
  2. Clean system and replace fuel filter.
  3. (Refer to FUEL PUMP ).
  4. Replace cylinder head gasket.
  5. (Refer to DIAGNOSIS AND TESTING  ), repair as necessary.
  6. Replace as necessary.
  7. Inspect and replace as necessary.
  8. (Refer to IGNITION COIL ).
  9. Refer to VALVE TIMING  .
1. ENGINE MISSES ON ACCELERATION
  1. Spark plugs dirty or incorrectly gapped.
  2. Dirt in fuel system.
  3. Burned, warped or pitted valves.
  4. Faulty coil.
  1. (Refer to CLEANING ).
  2. Clean fuel system.
  3. Replace as necessary.
  4. (Refer to IGNITION COIL ).
1. ENGINE MISSES AT HIGH SPEED
  1. Spark plugs dirty or incorrectly gapped.
  2. Faulty coil.
  3. Dirt or water in fuel system.
  1. (Refer to CLEANING ).
  2. (Refer to IGNITION COIL ).
  3. Clean system and replace fuel filter.
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