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 MANUALSCHEVROLET1987SUBURBAN 3/4 TON 2WD V8-454 7.4LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION TIMINGADJUSTMENTSEXCEPT DISTRIBUTORLESS IGNITION SYSTEM (DIS)
1987 Chevrolet Suburban 3/4 Ton 2WD V8-454 7.4L
Except Distributorless Ignition System (DIS)
1987 Chevrolet Suburban 3/4 Ton 2WD V8-454 7.4LSECTION Except Distributorless Ignition System (DIS)
Set timing at slow idle and Before Top Dead Center, unless otherwise specified.
2.5L (151), ground diagnostic connector under dash. Average pulses of cylinders 1 & 4.
2.8L (173) FI, place system in bypass mode, disconnect tan/black wire by ECM in passenger compartment.
2.8L (173) 2V EST, disconnect 4-wire connector at distributor.
4.3L (262) FI, place system in bypass mode, disconnect tan/black wire at distributor.
All V8 W/FI, place system in bypass mode, disconnect tan/black wire inboard of bulkhead.
All others, disconnect & plug distributor vacuum hoses(s).
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.