3Xvette

I have a 2005 corvette ,with cam and headers. I have had this work done to my car several years ago and what i noticed this year is when I started driving it the engine light will flash causing the car to mis fire and run real rough. after maybe 10 min engine light goes away and it runs fine. I checked for any codes and there was none.

I changed the spark plugs and wires and fired it up and no faults and ran good. But I have been real busy at work the last two years and I know I let the car sit for weeks at a time but it seems when I first start it up and pull out of the driveway the engine light flashes again so I drove for about 15 min and it was still there.

Hooked up code reader while car was still running and no codes were there to read, turned it off restarted the car and engine light went off and the car runs fine for the day.

Any help would be great to my next steps to solving this problem

Thanks

Steve

89Roadster

That sounds like the symptoms of one of the coils going bad. A burnt plug wire or bad spark plug could also cause it. If the engine light was flashing there should be a code stored for the cylinder that was causing it.

3Xvette

I also had taken it to my Buddy that has a tech 2 machine and no codes stored.

TurboLX

You actually have that backwards.

The MIL is flashing because you are experiencing misfire. I'm surprised there's no stored code, but that probably just means your tooner turned off the P0300 (and its related family of codes) in the calibration.

You need to find the root cause of the misfire. The first step is to look for something obvious on the hardware. Ignition systems, wires, plugs, coils, then move on to fueling by checking fuel trims too. If you don't find anything here, it's time to talk to the tooner (or a new one) to look at the calibration. If the ECU is able to hold close to lambda=1 fueling without too much correction, then spark advance in the other main variable. Too little (stock timing on a big cam at part throttle) can yield misfire. But since this seems to be a recent issue for you, I'd start with the mechanicals before accusing the calibration of being incorrect.