Hello i have a 1999 oldsmobile alero the car has 64000 mile on it only one code out of a million and the code is bank 1 system to lean now i done put new o2 senser, fuel filter, spark plugs, oil chan

Asked by Oct 15, 2015 at 10:31 PM about the 1999 Oldsmobile Alero 2 Dr GL Coupe

Question type: Maintenance & Repair

They told me my catilyac converter
may was dirty or clog so i had that put
in and the car stills seems to over heat
and loose power or may even shut off
can you please tell mw whats wrong
or what i havent check

1 Answer

72,485

Check for vacuum leaks. Especally at the intake manifold. It could also be an exhaust leak that's ahead of the upstream O2 sensor. Causing the computer to think that it's running lean. This can happen when fresh air is drawn into the exhaust system from a leak. However, since it's overheating I suspect that it really is running lean. Remove the spark plugs. If the electrodes (tips) are white it's definitely running lean. Any misfire codes (P0300, P0301, P0302, etc.)? HTH. -Jim

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