check engine light on 1992 Buick Century

check engine light comes on at 15 mph and goes off when I get to 45 mph.

by in North Myrtle Beach, SC on October 29, 2010
1 answer
ANSWER by on October 29, 2010
It is not normal for the Check Engine Light to come on. Check your owners manual. If you no longer have the owner's manual Check here or try this link you may be able to down load a free copy of the owner's manual for your vehicle If the Check Engine Light/Service Engine Soon light illuminates while you are driving, the car's on board computer sees a fault in the engines management system that is causing an excess amount of pollutants to be emitted from your car. This could result in engine damage if left neglected. Some problems that can cause the Check Engine light to stay on may take two "drive cycles' to complete before illuminating the Check Engine Light. The computer sees a problem and looks for an identical set of circumstances to occur to confirm that it has indeed seen a problem before turning on the light. A Check Engine light that continually flashes while you are driving is serious and is a sign that the computer sees a problem that seriously risks damaging the catalytic converter which may result in an expensive repair or even may cause a fire! Diagnostic codes are stored in the vehicle's computer and can be retrieved using a scantool that communicates with the computer in your car. We have in our Repairpal website an encyclopedia with in depth articles about computer, and computer control systems, emission and driveability problems.
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