Slight Backfiring and Mode 6 misfire

[p51302]

Hi,

 

I'm entering two posts that are sort of related I think.

 

I was hoping people would tell me their experience to know if I have an issue.

 

I'm fairly experienced with Auto Diagnostics, but I don't know the normal behavior for a GT500.

 

Here are the parameters to my question:

• the CEL is NOT illuminated
• Sitting at idle
• Car warmed up in closed loop
• I snap the throttle
• I sometimes get a slight small back-fire
• When this happens, in mode 6, "Misfires for Current Cycle", on differing cylinders, increments its Value parameter
• Yet, misfires in the "last 10 drive cycles and manufacture specific test" has value of 0 and result set as passed
• I've attached one such Scanner screen capture
• I unfortunately have not had a chance to view STFT and LTFT
• At idle, I cannot feel or hear a misfire. This only occurs on a snap. The car does not hesitate when accelerating normal or hammering it. It feels strong; you know like a Cobra should.

 

So, if you don't know anything of what I just said, you can still help me. When your car is warm at idle, snap the throttle, does your Cobra slightly back-fire?

 

Thanks