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.
Gasoline Engines
Idle speed is controlled by Powertrain Control Module (PCM) and is not adjustable. If engine idle concerns are present, check for contaminated fuel, vacuum leaks and incorrect ignition timing. Ensure throttle bore, EGR system and PCV system are clean. If these are okay, check PCM for Diagnostic Trouble Codes (DTCs). See appropriate SELF-DIAGNOSTICS article. If no DTCs exist, go to appropriate TROUBLE SHOOTING - NO CODES article.
| Application | RPM | ||||||
|---|---|---|---|---|---|---|---|
| Econoline | |||||||
| 4.2L | 750-850 | ||||||
| 4.6L | 680-830 | ||||||
| 5.4L | |||||||
| E150 | 750 | ||||||
| E250 Gasoline | 630-700 | ||||||
| E250 & E350 Super Duty CNG | 715-850 | ||||||
| 6.8L | |||||||
| Gasoline | 600-900 | ||||||
| LPG | 790-930 | ||||||
| 7.3L | (2) | ||||||
| Escape | |||||||
| 2.0L | 800-900 | ||||||
| 3.0L | 730-750 | ||||||
| Excursion | |||||||
| 5.4L | 650-760 | ||||||
| 6.8L | 800-950 | ||||||
| 7.3L | (2) | ||||||
| Expedition | |||||||
| 4.6L | 680-830 | ||||||
| 5.4L | 700-760 | ||||||
| Explorer & Mountaineer | |||||||
| 4.0L | |||||||
| OHV | (2) | ||||||
| SOHC | 670-750 | ||||||
| 5.0L | 700-750 | ||||||
| Explorer Sport | |||||||
| 4.0L | |||||||
| Gasoline | 760-880 | ||||||
| Flex-Fuel | 800-900 | ||||||
| Explorer Sport Trac | |||||||
| 4.0L | |||||||
| Gasoline | 760-880 | ||||||
| Flex-Fuel | 800-900 | ||||||
| Pickup | |||||||
| 4.2L | 750-850 | ||||||
| 4.6L | 680-830 | ||||||
| 5.4L | |||||||
| F150 Gasoline (Except Lightning) | 720 | ||||||
| F150 Gasoline (Lightning) | 700 | ||||||
| F150 CNG | 715-850 | ||||||
| F250/F350 Super Duty | 630-700 | ||||||
| 6.8L | 600-900 | ||||||
| 7.3L | (2) | ||||||
| Navigator | 690-710 | ||||||
| Ranger | |||||||
| 2.3L | 800-950 | ||||||
| 2.5L | 800-950 | ||||||
| 3.0L | |||||||
| A/T | 880-920 | ||||||
| M/T | 800-830 | ||||||
| Flex-Fuel | 880-920 | ||||||
| 4.0L | 800-1000 | ||||||
| Villager | 700-800 | ||||||
| Windstar | 700-730 | ||||||
|
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Use the Manual With the Right Hardware
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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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