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 MANUALSPLYMOUTH1990LASER RS, 2.0 R, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSINTRODUCTIONCURB IDLE SPEED CHECK
1990 Plymouth Laser RS, 2.0 R, Standard
Curb Idle Speed Check
1990 Plymouth Laser RS, 2.0 R, StandardSECTION Curb Idle Speed Check
- Ensure engine is at operating temperature and all accessories are off. Place transmission in Neutral and front wheels are in a straight-ahead position.
- Check ignition timing and adjust if necessary. Run engine at 2000-3000 RPM for more than 5 seconds. Allow engine to idle for 2 minutes. Check idle speed. Refer to IDLE SPEED SPECIFICATIONS . If idle speed is not within specification, diagnosis of Idle Speed Control (ISC) motor is necessary.
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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.