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 MANUALSPLYMOUTH1993LASER FWD L4-1753CC 1.8L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMSPARK PLUGTESTING AND INSPECTION
1993 Plymouth Laser FWD L4-1753cc 1.8L SOHC
Spark Plug: Testing and Inspection
1993 Plymouth Laser FWD L4-1753cc 1.8L SOHCSECTION Testing and Inspection
Caution: If the spark plug cable is removed by pulling on the cable, it may be damaged.
1. Disconnect spark plug cable from the spark plug.
2. Using a plug wrench, remove all plugs from cylinder head.
Caution: Use care not to allow foreign matter to enter through plug holes.
3. Check the spark plugs for the following:
- Broken insulator
- Worn electrode
- Carbon deposits
- Damaged or broken gasket
- Burnt condition of porcelain insulator at spark gap.
Note: Dark deposits indicate too rich a fuel mixture, light (white) deposits indicate too lean a fuel mixture, advanced ignition timing or insufficient plug tightening
4. Check plug gap using a plug gap gauge and adjust if necessary.
Standard value: .028 - 0.031 in (.7 - .8 mm)
5. Tighten spark plug to specified torque. If overtorqueing occurs, damage to threaded portion of cylinder head might result.
Spark plug torque: 14-22 ft.lb (20 - 30 Nm)
1. Disconnect spark plug cable from the spark plug.
2. Using a plug wrench, remove all plugs from cylinder head.
Caution: Use care not to allow foreign matter to enter through plug holes.
3. Check the spark plugs for the following:
- Broken insulator
- Worn electrode
- Carbon deposits
- Damaged or broken gasket
- Burnt condition of porcelain insulator at spark gap.
Note: Dark deposits indicate too rich a fuel mixture, light (white) deposits indicate too lean a fuel mixture, advanced ignition timing or insufficient plug tightening
4. Check plug gap using a plug gap gauge and adjust if necessary.
Standard value: .028 - 0.031 in (.7 - .8 mm)
5. Tighten spark plug to specified torque. If overtorqueing occurs, damage to threaded portion of cylinder head might result.
Spark plug torque: 14-22 ft.lb (20 - 30 Nm)
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.