Question about 1999 Chevrolet Malibu
3.1 engine I already change the upstream O2 sensor and the evap purge solenoid then I cleared the codes and the codes came back
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Posted on Jan 02, 2017
there are a couple of things, first make sure there are not restriction in the exhaust, i know the dealer has had to replace converters under warranty because of this problem, then theres a reflesh program for the computer due to this problem, and lastly,run with egr off make sure it clean of carbon,carbon gets stuck in pintle sets check eng lightbut carbon then blows by so when you remove egr you see nothing, well start with these good luck.
Posted on Nov 28, 2009
SOURCE: O2 sensor and evap solenoid
Hello you must disconect battery while replaceing this parts.This is a saftey messure also it alows the computer to reboot once conected and will reset the engine light and put it out for you.If you did not disconect the battery chances are you will still have service engine light on.Disconect your battery wait a couple of minutes reconect that should do it for you .Hope my support helped you.regee
Posted on Dec 25, 2009
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Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
Inspect the EVAP system for cuts/holes in tubes/hoses
Inspect for damaged or disconnected hoses around the Evap purge solenoid
Check and/or replace the sensor
Check and/or replace the purge valve
Have a professional use a smoke machine to detect leaks
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