Service Engine Soon Light/blinked

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jermit

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Service Engine Soon Light:
05 Pontiac Grand Am -V6 66600 Miles:

The light blinked several times for about a minute yesterday on the freeway.

After attaching an ODB-II, There weren't any Diagnostic trouble codes, MIL was off. The I/M Monitors had 8 Ready:
Misfire,fuel,comp,catalyst,evap,os snsr,os htr,egr. (all normal)

The light has not flashed since yesterday.

In a professionals opinion, could it be an old code in the computer system that needs to be erased? I am going to do so w/ the ODB reader. Erase the codes and watch to see if the SES light flashes again. Since buying the car @ 56,000, I have done 2 oil changes, given it a tune up and rotated the tires once.
I forgot to mention, it feels like it misfires intermittently when it starts. Once or twice a week it seems. Could this be the cause?
I'd appreciate any feedback.
 
A flashing ses light means catylist damaging missfire. There should be a code stored?
 
sense you did a tune up on it, i would check the spark plug wires to make sure they are routed properly, not worn through and arcing on anything. and there should be a code somewhere if the light came on
 
There's not always a code stored when you have what they call a catastrophic misfire (when your light is blinking). If you have a smart phone download the app called Torque and find an OBDII adapter on ebay for $25 or so. You can monitor the system as you are driving and catch it when it acts up again. I agree though, I'd check the wires again first.
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Update

Wires are fine, spark plugs fine. Engine light intermittent, about 2 times a week. I took the suggestion on the ODBII Torque app, recently and am learning how to set up the PIDS to monitor for the misfire. Still no ODB codes stored in the ECU.
 
tavia454 said:
There's not always a code stored when you have what they call a catastrophic misfire (when your light is blinking). If you have a smart phone download the app called Torque and find an OBDII adapter on ebay for $25 or so. You can monitor the system as you are driving and catch it when it acts up again. I agree though, I'd check the wires again first.
Click to expand...

Took this suggestion using the Torque tool. Well at least I installed the app and bought an adapter. Trying to figure out what PID's I need to select to exploit cylinder activity. Again there aren't any codes stored in the ECU. Any suggestions on PIDS?
 
Try looking under driver side of dashboard left of steering column.
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