Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2004LX 470 V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGTESTING AND INSPECTION
2004 Lexus LX 470 V8-4.7L (2UZ-FE)
Ignition Timing: Testing and Inspection
2004 Lexus LX 470 V8-4.7L (2UZ-FE)SECTION Testing and Inspection
IGNITION TIMING
INSPECTION
1. REMOVE BATTERY CLAMP COVER
2. REMOVE INTAKE AIR CONNECTOR
3. REMOVE V-BANK COVER
4. WARM UP ENGINE
Allow the engine to warm up to the normal operating temperature.
5. CONNECT TOYOTA HANDHELD TESTER OR OBD II SCAN TOOL
a. Connect the TOYOTA hand-held tester or OBD II scan tool to the DLC3.
b. Please refer to the TOYOTA hand-held tester or OBD II scan tool operator's manual for further details.
6. CONNECT TIMING LIGHT TO ENGINE
Connect the tester probe of a timing light to the wire of the ignition coil connector for No.1 cylinder.
7. CHECK IDLE SPEED
a. Race the engine speed at 2,500 rpm for approximately 90 seconds. Check the idle speed.
Idle speed: 700 ± 50 rpm
8. INSPECT IGNITION TIMING
a. Using SST, connect terminal TO and E1 of the DLC1.
SST 09843-18020
b. Using a timing light, check the ignition timing.
Ignition timing: 5 - 15° BTDC @ idle (Transmission in neutral position)
c. Remove SST from the DLC1.
SST 09843-18020
9. DISCONNECT TIMING LIGHT FROM ENGINE
10. DISCONNECT TOYOTA HAND-HELD TESTER OR OBD II SCAN TOOL
11. REINSTALL V-BANK COVER
12. REINSTALL INTAKE AIR CONNECTOR
13. REINSTALL BATTERY CLAMP COVER
INSPECTION
1. REMOVE BATTERY CLAMP COVER
2. REMOVE INTAKE AIR CONNECTOR
3. REMOVE V-BANK COVER
4. WARM UP ENGINE
Allow the engine to warm up to the normal operating temperature.
5. CONNECT TOYOTA HANDHELD TESTER OR OBD II SCAN TOOL
a. Connect the TOYOTA hand-held tester or OBD II scan tool to the DLC3.
b. Please refer to the TOYOTA hand-held tester or OBD II scan tool operator's manual for further details.
6. CONNECT TIMING LIGHT TO ENGINE
Connect the tester probe of a timing light to the wire of the ignition coil connector for No.1 cylinder.
7. CHECK IDLE SPEED
a. Race the engine speed at 2,500 rpm for approximately 90 seconds. Check the idle speed.
Idle speed: 700 ± 50 rpm
8. INSPECT IGNITION TIMING
a. Using SST, connect terminal TO and E1 of the DLC1.
SST 09843-18020
b. Using a timing light, check the ignition timing.
Ignition timing: 5 - 15° BTDC @ idle (Transmission in neutral position)
c. Remove SST from the DLC1.
SST 09843-18020
9. DISCONNECT TIMING LIGHT FROM ENGINE
10. DISCONNECT TOYOTA HAND-HELD TESTER OR OBD II SCAN TOOL
11. REINSTALL V-BANK COVER
12. REINSTALL INTAKE AIR CONNECTOR
13. REINSTALL BATTERY CLAMP COVER
RENDER: 1.0x
NO RELATED
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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.