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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 954 (3.5L ENGINE (SERVICE INFORMATION))ENGINE 3.5LDIAGNOSIS AND TESTINGDIAGNOSIS AND TESTING - ENGINE PERFORMANCE
2004 Toyota Matrix XR, FWD, Standard

Diagnosis And Testing - Engine Performance

2004 Toyota Matrix XR, FWD, StandardSECTION Diagnosis And Testing - Engine Performance
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSIS AND TESTING - ENGINE PERFORMANCE

CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START
  1. Weak battery.
  2. Corroded or loose battery connections.
  3. Faulty starter.
  4. Faulty coil(s) or control unit.
  5. Incorrect spark plug gap.
  6. Contamination in fuel system.
  7. Faulty fuel pump.
  8. Incorrect engine timing.
  1. Test battery. Charge or replace as necessary. (Refer to BATTERY SYSTEM )
  2. Clean and tighten battery connections. Apply a "coat of light mineral grease to terminals.
  3. Test starting system. (Refer to STARTING )
  4. Test and replace as needed.
  5. Check and adjust gap as needed.
  6. Clean system and replace fuel filter.
  7. Test fuel pump and replace as needed.
  8. Check for a skipped timing belt or a loose camshaft sprocket.
ENGINE STALLS OR IDLES ROUGH
  1. Idle speed too low.
  2. Incorrect fuel mixture.
  3. Intake manifold leakage.
  4. Faulty coil(s).
  1. Test minimum air flow.
  2. (Refer to POWERTRAIN DIAGNOSTIC PROCEDURES )
  3. Inspect intake manifold gasket, manifold, and vacuum hoses.
  4. Test and replace as necessary. (Refer to IGNITION CONTROL )
ENGINE LOSS OF POWER
  1. Dirty or incorrectly gapped plugs.
  2. Contamination in fuel system.
  3. Faulty fuel pump.
  4. Incorrect valve timing.
  5. Leaking cylinder head gasket.
  6. Low compression.
  7. Burned, warped, or pitted valves.
  8. Plugged or restricted exhaust system.
  9. Faulty coil(s).
  1. Set gap as needed or replace plug(s).
  2. Clean system and replace fuel filter.
  3. Test and replace as necessary.
  4. Correct valve timing as needed.
  5. Replace cylinder head gasket.
  6. Test compression of each cylinder.
  7. Replace valves.
  8. Check exhaust system restriction. Replace parts, as necessary.
  9. Test and replace as necessary. (Refer to IGNITION CONTROL )
ENGINE MISSES ON ACCELERATION
  1. Dirty or incorrectly gapped spark plugs.
  2. Contamination in Fuel System.
  3. Burned, warped, or pitted valves.
  4. Faulty coil(s).
  1. Set gap as needed or replace plug(s).
  2. Clean fuel system and replace fuel filter.
  3. Replace valves.
  4. Test and replace as necessary. (Refer to IGNITION CONTROL )
ENGINE MISSES AT HIGH SPEED
  1. Dirty or incorrect spark plug gap.
  2. Faulty coil(s).
  3. Dirty fuel injector(s).
  4. Contamination in fuel system.
  1. Set gap as needed or replace plug(s).
  2. Test and replace as necessary. (Refer to IGNITION CONTROL )
  3. Test and replace as necessary. )
  4. Clean system and replace fuel filter.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.