Question about 1993 Oldsmobile Cutlass Supreme

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Vehicle runs rough and seems to be flooded

Changed plugs and oil on vehicle still having problems.

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  • Sam Carter May 11, 2010

    have you changed the plug wires, cap and rotor and fuel filter on the vehicle? those are the first things to cause problems like that.

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Assuming it has a 3.1 V-6, it could be any # of failures. Bad plug wires, ignition coils, control module (under coil packs), crankshaft position sensor, map sensor, throttle position sensor, egr valve, fuel pressure regulator, fuel injectors, engine coolant temperature sensor, vacuum leaks; have it scanned for trouble codes to help in diagnosing! If you think it is just over fueling (flooding),look at fuel pressure regulator or coolant temp sensor ( when they fail the computer thinks its always -40 F causing it to over fuel). A bad map sensor can cause the same. Hope this helps. Thanks in advance for rating me!

Posted on Jan 22, 2009

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Posted on Jan 02, 2017

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1 Answer

We think that it stopped running due to no fuel. the engine ran rough ever since. Seems to be flooding to the point that fuel was getting into the oil in the sump. Running rough ever since.


Get a cylinder compression test done to check head gasket and to check head is not warped or cracked.
if head gasket or head problem = one cylinder may be affected causing fuel could get into the oil via a blown head gasket. if one cylinder not firing it would run rough.

Has the engine been over heated recently ?

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Hi Brian,

The airflow sensor is working with temperature. If there is a problem the car will flud with fuel. I suggest that you change this senror.

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when you replaced the plugs/wires. Did you do the cap and rotor too
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