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 MANUALSCHEVROLET1986BLAZER FULL SIZE V8-305 5.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGADJUSTMENTSCALIFORNIA
1986 Chevrolet Blazer Full Size V8-305 5.0L
California
1986 Chevrolet Blazer Full Size V8-305 5.0LSECTION California
IGNITION TIMING PROCEDURE
1. Warm engine to normal operating temperature (upper radiator hose hot).
2. Place transmission in Neutral or Park. Apply parking brake and block wheels.
3. Choke must be open.
4. Connect tachometer and an inductive timing light to number one spark plug wire.
5. Turn off engine, disconnect 4 wire Electronic Spark Timing connector at distributor, restart engine.
6. Check ignition timing and compare to specification. Ignition Timing
7. If timing is not to specification, adjust as follows:
- Loosen distributor hold-down bolt and rotate distributor until timing mark on pulley or damper is aligned with specified degree on timing scale.
- Retighten the hold-down bolt and recheck timing.
8. Remove test equipment and reconnect wire Electronic Spark Timing connector at distributor.
1. Warm engine to normal operating temperature (upper radiator hose hot).
2. Place transmission in Neutral or Park. Apply parking brake and block wheels.
3. Choke must be open.
FIRING ORDER:
4. Connect tachometer and an inductive timing light to number one spark plug wire.
5. Turn off engine, disconnect 4 wire Electronic Spark Timing connector at distributor, restart engine.
6. Check ignition timing and compare to specification. Ignition Timing
7. If timing is not to specification, adjust as follows:
- Loosen distributor hold-down bolt and rotate distributor until timing mark on pulley or damper is aligned with specified degree on timing scale.
- Retighten the hold-down bolt and recheck timing.
8. Remove test equipment and reconnect wire Electronic Spark Timing connector at distributor.
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.