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 Cadillac SevilleFACTORY OEM SERVICE PROCEDURE
Trouble Shooting: Notes
NOTE:
Diagnosis of fuel system should begin with a fuel pump pressure test. Connect Fuel Pressure Gauge (J-25400-300) to fuel line servicing fitting and measure fuel pressure while cranking engine. Use FUEL SYSTEM DIAGNOSIS chart if pressure is not between 9-12 psi. See Fig 1
. Use the DFI FUEL INJECTOR SYSTEM DIAGNOSIS chart if pressure is between 9-12 psi. See Figure
and Figure
.
Factory Service Tools
Use the Manual With the Right Hardware
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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.