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Intermittant/Bad O2 sensor?

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
Is it possible to have an intermittant (or bad) O2 sensor that would cause an occasional misfire, causing the service engine light to come on, but NOT set a code? I've had this situation going on for about a month now, but it only happens after the car has not been driven for a few days.

Thanks, JCS44
96 LT4 Vert
 

bradfordsvettes

Well-known member
Joined
Mar 28, 2001
Messages
549
Location
Boston, MA area
Corvette
jewel blue 61.cranberry 69 t-top.black rose 92
i do not think a n o2 would give you a misfire but i supose anything is possible can you grab a code when the light is on ? I would suspect a bad ground or some other part failing maybe even ecm if it is not storing codes Steve
 

jcs44

Well-known member
Joined
Mar 8, 2004
Messages
161
Location
Harvest, AL
Corvette
2003 Z06 Torch Red/Black
What I've got is the service engine soon light coming on but not setting a code. The light goes off within a day, and it may then stay off for a few days, but eventually it comes back on. This began after having the plugs, water pump, and distributor cap and rotor replaced.
 

David-F

Well-known member
Joined
Mar 28, 2007
Messages
53
Location
Woodstock,GA
What are you using to check for codes? If the service engine soon light comes on a code should set, especialy with a rough idle, unless there is a problem with the PCM if there is an internal problem in the PCM a light could come on and the engine run poorly and not set any codes you will need to have a scan tool hooked up to check for this you can also jump 4 to 12 on the ALDL connector to actavate the CCM diagnostics and check for codes in other modules were they may have lost communacation with the PCM, this is a good quick check to find falty PCMc in 90 to 96 in most cases you will set a code 41 in the CCM.

David Fulcher
 

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