I have been getting the dreadful P0300. I have done all possible things including a visit to GM dealer with no luck. The CEL Blinks at the top of forth gear from 20:16:21 up to 20:16:25. There is no felt loss in power. For the tune experts, do you see anything abnormal in my attached data? Please Help identifying the cause if any?
07’ LS2 Edit tune by Halltech.
Car CEL Blinks with stock tune as well
The little bit of scanner data shown says the tune is the cause, it stinks.
You notice fuel LTFTs running -4 % too rich and at times right side was -9% rich.
This will cause misfires.
At the same time there looks like engine knock ( image is not very clear to see all values)
Worse is at WOT the 02 sensors reporting over 1 volt so pig rich ( should be about 0.850 mVolts)
You need to setup scanner to collect the misfire counters for for each cylinder's current and history counters and then see if the same cylinders always are the ones misfiring or if it is random misfires.
Fire whoever tuned it and get a real pro to do what you are paying for.
racing vette pretty much said it all. other than the FT being off most likely wont be your issue, we see cars all the time that are a fre % off each other, BUT the rich issue will do it for sure, your tune is way rich. You also do need to log misfires, see if its all one CYl or all on one side, or all over the place.
But what i would start with is lean that baby out some, and see if that doesnt clear it up for you.
as for the KR is that showing 9* of knock at 20:15:16? thats alot. its hard to see
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racing vette pretty much said it all. other than the FT being off most likely wont be your issue, we see cars all the time that are a fre % off each other, BUT the rich issue will do it for sure, your tune is way rich. You also do need to log misfires, see if its all one CYl or all on one side, or all over the place.
But what i would start with is lean that baby out some, and see if that doesnt clear it up for you.
as for the KR is that showing 9* of knock at 20:15:16? thats alot. its hard to see
I was finally able to identify my mystery misfire cause. It was due to a lose coil bolt which did not allow for proper earthing between the coil and the cylinder head cover. As far as the knock retard, it is actually reading 9x10^-2 or 0.09 which I think is pretty low considering the 44 deg. C (112 F) ambient air temp. I was running at .
Thanks for the replies guys
Corvette Store
Scanned my Run, I need analyses...P0300
