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.
1993 Cadillac Eldorado V8-300 4.9LFACTORY OEM SERVICE PROCEDURE
Distributor: Description and Operation
Computer Inputs
The distributor provides the PCM with engine speed (REF HI), fuel control (CAM HI), ignition control (BYPASS and IGNITION CONTROL) and ground reference (REF LO) information.
Computer Outputs
The PCM uses distributor information for fuel control, idle speed control and ignition control (which it outputs back to the distributor).
Fault Codes
A fault with any of the output signals between the distributor and PCM will cause various driveability conditions and should set a PCM Trouble Code.
The distributor provides the PCM with engine speed (REF HI), fuel control (CAM HI), ignition control (BYPASS and IGNITION CONTROL) and ground reference (REF LO) information.
Computer Outputs
The PCM uses distributor information for fuel control, idle speed control and ignition control (which it outputs back to the distributor).
Fault Codes
A fault with any of the output signals between the distributor and PCM will cause various driveability conditions and should set a PCM Trouble Code.
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.
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