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 MANUALSPONTIAC1991LEMANS LE, 2D HATCHBACK, AUTOMATIC, 3T40/MD9REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIDLE SPEED & IGNITION TIMING
1991 Pontiac LeMans LE, 2D Hatchback, Automatic, 3T40/MD9
Idle Speed & Ignition Timing
1991 Pontiac LeMans LE, 2D Hatchback, Automatic, 3T40/MD9SECTION Idle Speed & Ignition Timing
NOTE:
Ensure idle speed and ignition timing are set to specification. For adjustment procedures, see ADJUSTMENTS
article in the ENGINE PERFORMANCE Section.
MINIMUM IDLE SPEED SPECIFICATIONS (1)
| Application | RPM | ||
|---|---|---|---|
| Automatic Transmission (Neutral) | 450-550 | ||
| Manual Transmission | 550-650 | ||
|
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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.