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 MANUALSCADILLAC1993FLEETWOOD BROUGHAM V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONTESTING AND INSPECTION
1993 Cadillac Fleetwood Brougham V8-350 5.7L
Exhaust Gas Recirculation: Testing and Inspection
1993 Cadillac Fleetwood Brougham V8-350 5.7LSECTION Testing and Inspection
EGR FAILURE MODES
Too Much EGR Flow
If too much EGR is flowing at idle, cruise, or cold operation, any of the following conditions could exist:
a. The engine dies after cold start.
b. The engine stalls on deceleration.
c. The vehicle surges during cruise mode.
d. Rough idle.
Too Little EGR Flow
If too little or no exhaust gases flow, the combustion chamber temperature may increase under acceleration or heavy load conditions. These conditions could cause:
a. Detonation (Spark Knock).
b. The engine to overheat.
c. The emissions test to fail.
ADDITIONAL INFORMATION
For diagnostic procedures, refer to Computers and Control Systems/System Diagnosis/Procedures/Diagnostic Charts/Chart C-7 Exhaust Gas Recirculation Check. Chart C-7 EGR System Check
Too Much EGR Flow
If too much EGR is flowing at idle, cruise, or cold operation, any of the following conditions could exist:
a. The engine dies after cold start.
b. The engine stalls on deceleration.
c. The vehicle surges during cruise mode.
d. Rough idle.
Too Little EGR Flow
If too little or no exhaust gases flow, the combustion chamber temperature may increase under acceleration or heavy load conditions. These conditions could cause:
a. Detonation (Spark Knock).
b. The engine to overheat.
c. The emissions test to fail.
ADDITIONAL INFORMATION
For diagnostic procedures, refer to Computers and Control Systems/System Diagnosis/Procedures/Diagnostic Charts/Chart C-7 Exhaust Gas Recirculation Check. Chart C-7 EGR System Check
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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.