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Cadillac Fleetwood Problems

Smog Check Failure Due to Excessive Carbon Buildup on Cadillac Fleetwood

Problem Description and Possible Solution

Excessive carbon build up in the engine combustion chambers may be the cause of a smog check failure due to excess NOx emissions. A "top engine" decoarbonization cleaning procedure will commonly correct this concern.

(6 people reported this problem)

Cadillac Fleetwood Vehicles With This Problem

RepairPal Verified
Average mileage: 84,000 (84,000–84,000)
4 model years affected: 1990, 1991, 1992, 1993
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