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 MANUALSCHEVROLET1985S10/T10 P/U 4WD L4-119 1.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGADJUSTMENTS
1985 Chevrolet S10/T10 P/U 4WD L4-119 1.9L
Ignition Timing: Adjustments
1985 Chevrolet S10/T10 P/U 4WD L4-119 1.9LSECTION Adjustments
NOTE: Refer to the Vehicle Emissions Control Information label located on the radiator support panel. Follow all instructions on the label.
IGNITION TIMING ADJUSTMENT
- Verify the Idle Speed is within specifications, adjust if necessary.
- With ignition "OFF", connect the pick-up lead of timing light to the number one spark plug.
- Disconnect and plug vacuum line at distributor vacuum advance.
- Start the engine, and aim the timing light at the timing mark. The line on the pulley should line up with the timing mark. Specifications
- If an adjustment is necessary:
- Loosen the distributor hold-down clamp bolt at the base of the distributor.
- While observing the mark with the timing light, slightly rotate the distributor until the line indicates the correct timing.
- Tighten the hold-down bolt, and re-check the timing.
- Turn off the engine and remove the timing light.
- Reconnect the vacuum line to the distributor advance.
- Recheck Idle Speed and adjust if necessary.
FIRING ORDER 1.9L (119) 1-3-4-2:
IGNITION TIMING ADJUSTMENT
- Verify the Idle Speed is within specifications, adjust if necessary.
- With ignition "OFF", connect the pick-up lead of timing light to the number one spark plug.
- Disconnect and plug vacuum line at distributor vacuum advance.
TIMING MARK 1.9L (119):
- Start the engine, and aim the timing light at the timing mark. The line on the pulley should line up with the timing mark. Specifications
- If an adjustment is necessary:
- Loosen the distributor hold-down clamp bolt at the base of the distributor.
- While observing the mark with the timing light, slightly rotate the distributor until the line indicates the correct timing.
- Tighten the hold-down bolt, and re-check the timing.
- Turn off the engine and remove the timing light.
- Reconnect the vacuum line to the distributor advance.
- Recheck Idle Speed and adjust if necessary.
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.