miss fire p0300 codes xx, help

[cgng30]

i started my car and as i backed up i got a cel light visit workshop. i drove the car for fer minutes and drove back. car is running fine. diagnostics shows up th e following codes. i reet the codes and monitired for a while on duramentrics for all cylinders, occasionlly couple cylindrs miss fired. and then all was fine.

any idea why this happened.

here are the codes

997 Selected

DME 7.8 (9X7) Selected

About to get fault codes

moduleType = MotronicDME78

DTC Count = 5

Fault Number:P0300

Description:Misfiring

Repair Infomation:checksum error

DTC Count = 5

Fault Number:P0302

Description:Misfiring cylinder 2

DTC Count = 5

Fault Number:P0303

Description:Misfiring cylinder 3

DTC Count = 5

Fault Number:P0305

Description:Misfiring cylinder 5

DTC Count = 5

Fault Number:P0306

Description:Misfiring cylinder 6

thanks

[Loren]

Any work done on the car (i.e. spark plugs)?

Did the car get wet (very wet)?

[cgng30]

Any work done on the car (i.e. spark plugs)?

Did the car get wet (very wet)?

nope no work done. washed a car few days ago, but drove it since then and had no issues. I did instlall the softronics flash, but that was few weeks ago and had no issues untill now. could it be the softronics flash?

[Loren]

Did you buy the package that lets you go back to stock?

If so you might try going back to stock. It is very strange to have random misfires - 2 on each bank.

[PNog]

Did you find the solution to this problem. I'm particularly interested because I have the exact same issue on my '97 C2S. The misfire codes for cylinders 2,3,5 & 6 have shown up repeatedly after each time I've cleared them...never 1 or 4.

I've been told it's either bad/dirty injectors or a bad Dual Mass Flywheel. I'm not eager to replace either if I don't have to, so I'd certainly like to hear if you figured out your problem.

Thanks

[Joel Pirela]

maybe cracked coils?

[PNog]

maybe cracked coils?

I checked those out on the scope and the coils are fine...plus I doubt two would have cracked at the same time.

The thing that strikes me as odd, is that it's the exact same cylinders misfiring as the ones listed by the other poster...it must either be the same problem or something in the way the OBDII system tracks the misfires that only reports those cylinders.

[RCH997]

I had a similar issue with my 2005 base. After several dealer visits, new coils etc. I was still getting missfires. They generally occurred on start-up or idle (low rev activities). Then, finally, after taking apart the intake, the service tech noted the air filter was quite dirty and thus possibly restricting air flow. A new filter was added and 6 weeks later no misfires! Go figure.