ENGINE COMPRESSION
Check engine compression with engine at normal operating temperature, specified cranking speed, all spark plugs removed and throttle wide open.
VALVE CLEARANCE
Note. All engines, except QG18DE, QR25DE and VQ35DE, are equipped with hydraulic lifters. Adjustments are not required.
| Application | In. (mm) |
|---|
| Altima, Sentra (2.5L) & Murano |
| Intake | .013-.016 (.32-.40) |
| Exhaust | .013-.016 (.33-.41) |
| Altima, Maxima, Pathfinder & 350Z |
| Intake | (2) .010-.013 (.26-.34) |
| Exhaust | (2) .011-.015 (.29-.37) |
| Frontier & Xterra (2.4L) |
| Intake | .012-.015 (.31-.39) |
| Exhaust | .015-.019 (.39-.47) |
| Sentra (1.8L) |
| Intake | .008-.019 (.21-.47) |
| Exhaust | .012-.022 (.30-.56) |
| (1) Unless otherwise specified, measure valve clearance with engine hot. (2) Measure valve clearance with engine cold. |
| (1) | Unless otherwise specified, measure valve clearance with engine hot. |
| (2) | Measure valve clearance with engine cold. |
VALVE CLEARANCE SPECIFICATIONS (1)
IGNITION COIL
Note. To test ignition coil(s) see, IGNITION SYSTEM in SYSTEM & COMPONENT TESTING article.
IGNITION WIRES (RESISTANCE)
Note. Ignition wire resistance is not available from manufacturer.
SPARK PLUGS
| Application | NGK |
|---|
| Altima, Maxima, Murano, Pathfinder, Sentra & 350Z |
| Standard | PLFR5A-11 |
| Cold | PLFR6A-11 |
| Hot | PLFR4A-11 |
| Frontier & Xterra |
| 2.4L |
| Standard | PFR5G-11 |
| Cold | PFR6G-11 |
| 3.3L (Except Supercharged) |
| Standard | PFR5G-11 |
| Cold | PFR6G-11 |
| Hot | PFR4G-11 |
| 3.3L (Supercharged) |
| Standard | PFR6G-11 |
| Cold | PFR7G-11 |
| Hot | PFR5G-11 |
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|
| All Models | .043 (1.10) | 14-22 (20-29) |
SPARK PLUG SPECIFICATIONS
FIRING ORDER & DISTRIBUTOR ROTATION
Note. Use appropriate illustration for firing order and distributor rotation. (Scheme 1)- (Scheme 4).
Scheme 1
Scheme 1: 1.8L & 2.5L Firing Order (Altima & Sentra)
Scheme 2
Scheme 2: 2.4L Firing Order & Distributor Rotation (Frontier & Xterra)
Scheme 3
Scheme 3: 3.3L Firing Order & Distributor Rotation (Frontier & Xterra)
Scheme 4
Scheme 4: 3.5L Firing Order (Altima, Maxima, Murano, Pathfinder & 350Z)
IGNITION TIMING
Note. For ignition timing adjustment procedures, see ON-VEHICLE ADJUSTMENTS article.
| Application | Degrees BTDC |
|---|
| Altima, Maxima, Murano, Pathfinder & 350Z | 10-20 |
| Frontier & Xterra (2) |
| 2.4L | 18-22 |
| 3.3L | 8-12 |
| Sentra |
| 1.8L |
| Automatic Transmission | 13-23 |
| Manual Transmission | 2-12 |
| 2.5L | 10-20 |
| (1) With transmission/transaxle in Neutral. (2) With TP sensor harness connector disconnected or using CONSULT-II WORK SUPPORT mode. |
| (1) | With transmission/transaxle in Neutral. |
| (2) | With TP sensor harness connector disconnected or using CONSULT-II WORK SUPPORT mode. |
IGNITION TIMING SPECIFICATIONS (1)
FUEL PUMP
| Application | At Idle W/O Vacuum - psi (kg/cm 2 ) | At Idle W/Vacuum - psi (kg/cm 2 ) |
|---|
| Altima (2.5L & 3.5L), Maxima, Murano, Sentra (1.8L & 2.5L) & 350Z | (1) | 51 (3.57) |
| Frontier & Xterra | 43 (3.00) | 34 (2.40) |
| Pathfinder (3.5L) | 43 (3.00) | 34 (2.40) |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
| Application | Resistance (Ohms) @ 77°F (25°C) |
|---|
| Altima, Murano, Sentra (2.5L) & 350Z | Approx. 1.0 |
| Maxima, Frontier, Xterra, Sentra (1.8L) & Pathfinder | 0.2-5.0 |
| (1) Information for Sentra Clean Air (CA) is not available from manufacturer. |
| (1) | Information for Sentra Clean Air (CA) is not available from manufacturer. |
FUEL INJECTOR
| Application | Resistance (Ohms) |
|---|
| Altima & Sentra (2.5L) | (2) 12.1-12.9 |
| Frontier & Xterra (2.4L) | (1) 7.3-9.9 |
| Frontier & Xterra (3.3L) | (1) 10.0-14.0 |
| Altima (3.5L), Maxima, Murano, Pathfinder, Sentra (1.8L) & 350Z | (2) 13.5-17.5 |
| (1) Check injector resistance at 77°F (25°C). (2) Check injector resistance at 68°F (20°C). |
| (1) | Check injector resistance at 77°F (25°C). |
| (2) | Check injector resistance at 68°F (20°C). |
IDLE SPEED & MIXTURE
Note. Idle mixture is not adjustable. For idle speed adjustment procedures, see THROTTLE POSITION SWITCH, IGNITION TIMING & IDLE SPEED in ON-VEHICLE ADJUSTMENTS article.
| Application | Base Idle RPM (2) | (2) Target Idle RPM |
|---|
| Altima | 700 | 650-750 |
| Frontier & Xterra |
| 2.4L | 700-800 | 750-850 |
| 3.3L | 650-750 | 700-800 |
| Maxima |
| A/T | 650-750 | 650-750 |
| M/T | 575-675 | 575-675 |
| Pathfinder | 700-800 | 700-800 |
| Sentra |
| 1.8L |
| A/T | 750-850 | 750-850 |
| M/T | 600-700 | 600-700 |
| 2.5L | 650-750 | 650-750 |
| Murano & 350Z | 600-700 | 600-700 |
| (1) Information for Sentra Clean Air (CA) not available from manufacturer. (2) With transmission/transaxle in Neutral. |
| (1) | Information for Sentra Clean Air (CA) not available from manufacturer. |
| (2) | With transmission/transaxle in Neutral. |
THROTTLE POSITION SENSOR
For adjustment specifications, see THROTTLE POSITION SWITCH, IGNITION TIMING & IDLE SPEED in ON-VEHICLE ADJUSTMENTS article.
THROTTLE POSITION SWITCH
For adjustment specifications, see THROTTLE POSITION SWITCH, IGNITION TIMING & IDLE SPEED in ON-VEHICLE ADJUSTMENTS article.
