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.
Idle Speed & Ignition Timing
Ensure idle speed and ignition timing are set to specification. Improper setting of ignition timing and idle speed may cause driveability problems and/or false setting of trouble codes. For adjustment procedures, see ADJUSTMENTS article.
| Application | Idle RPM | (1) Maximum CO Level | ||||||
|---|---|---|---|---|---|---|---|---|
| Altima | (2) 650-750 | 10.5% | ||||||
| Frontier | (2) 750-850 | 10.8% | ||||||
| Sentra & 200SX | ||||||||
| 1.6L | ||||||||
| A/T | (2) 750-850 | 11.0% | ||||||
| M/T | 625-725 | 11.0% | ||||||
| 2.0L | (2) 750-850 | 11.0% | ||||||
| 240SX | (2) 650-750 | 12.8% | ||||||
|
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| Application | Idle RPM | (1) Maximum CO Level | |||||
|---|---|---|---|---|---|---|---|
| Maxima | |||||||
| A/T | (2) 575-675 | 11.0% | |||||
| M/T | 575-675 | 11.0% | |||||
| Pathfinder & QX4 | (2) 700-800 | 8.0% | |||||
| Quest | (2) 700-800 | 10.8% | |||||
|
|||||||
| Application | Man. Trans. | (2) Auto. Trans. | |||||
|---|---|---|---|---|---|---|---|
| Altima & 240SX | 18-22 @ 650-750 | 18-22 @ 650-750 | |||||
| Frontier | 18-22 @ 750-850 | 18-22 @ 750-850 | |||||
| Sentra & 200SX | |||||||
| 1.6L | 6-10 @ 625-725 | 6-10 @ 750-850 | |||||
| 2.0L | 13-17 @ 750-850 | 13-17 @ 750-850 | |||||
|
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| Application | Man. Trans. | (2) Auto. Trans. | ||||
|---|---|---|---|---|---|---|
| Pathfinder, QX4 & Quest | 13-17 @ 700-800 | 13-17 @ 700-800 | ||||
| Maxima | 13-17 @ 575-675 | 13-17 @ 650-750 | ||||
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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.
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