Petscar

While running the 8 hard, a flashing CEL came on for about 5 seconds and then shut off. I know this may be a very broad question, but can anyone give me some ideas what could cause that??

i read all the possible causes of a flashing CEL, but nothing spoke of it shutting off within seconds.

200.mph

iTrader: (9)

misfire. how old is your ignition?

Petscar

27lk miles on car, new plugs. I have the new c coils and wires, just havent installed them yet.

200.mph

iTrader: (9)

change your coils and wires. might as well clean maf and ess while you are at it

UnknownJinX

I would do the coils ASAP then.

Misfire will destroy your cat quickly if you don't fix it.

mazdaverx7

iTrader: (6)

A flashing check engine light is not only a misfire, but a catalyst destroying misfire. Basically a misfire so bad that damage can result from the misfire.

As others have suggested, its time to inspect and replace the spark plugs, coils, and I would also suggest replacing the wires. Inspect the air filter for good measure and ensure there is no oil in the intake boot.

Loki

iTrader: (1)

It usually shuts off within seconds since you can't really maintain high load high rpm without needing to let off the throttle to change gears.

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Petscar

This was the first and only time it did it. I didnt notice or hear anything abnormal when it did it. Does that have any significance?

Loki

iTrader: (1)

Not really. Misfires are a silent killer.

UnknownJinX

Just put in new coils ASAP.

Petscar

Working to get it done. I am not going to drive it until then. I do have to travel 25 miles to bring it to Kris when he is available. Will driving slower or normal help in preventing another misfire?

Petscar

Another question, will a code show up if tested even though the CEL is no longer on?

UnknownJinX

There could be a pending code if it is still happening. A pending code is stored but not displayed until the ECU is sure it is happening.