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.
1986 Chevrolet S10 Blazer 2.8 R, RWD, AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel System Pressure Test
- Turn engine off and relieve fuel pressure. See FUEL SYSTEM PRESSURE RELIEF. Remove air cleaner and plug air cleaner (THERMAC) vacuum port on throttle body.
- Disconnect fuel line between throttle body and fuel filter. Install Fuel Pressure Gauge (J-29658) between throttle body and fuel filter. Start engine and observe fuel pressure reading.
- Fuel pressure should be 9-13 psi (.6-.9 kg/cm2 ). If not, see CHART A-5 (2.8L and 4.3L) or CHART A-7 (2.5L) in GENERAL MOTORS COMPUTER COMMAND CONTROL article in COMPUTERIZED ENGINE CONTROL section.
- After testing, relieve fuel pressure. Remove fuel pressure gauge and install fuel line between filter and throttle body. Start vehicle and watch for leaks. Remove plug from throttle body vacuum port and install air cleaner.
Factory Service Tools
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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.
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