P0300 high load -LS3 with E-Force LS9 cam

[Christian GM]

hi guys,
I recently did a 2009 LS3 6L80E, updated with E-Force, LS9 camshaft, LG high flow headers and cat.
only on heavy load, at high speed (around 200 km/h or more) and heavy throttle, the engine set up a P0300
any good tip for me?
I didn't have a log

thank you

[Mep_q8]

what kind of plugs you using?

check the narrowbands to make sure its an actual misfire.. if plugs are good look for a vacuum leak near the runners..

[Christian GM]

I tried with both NGK plug, and OEM ZR1 (LS9) Acdelco plug.
both standard gap and 0.035 gap.
nothing change,
can be a little lean on heavy load?

[Mep_q8]

can be a little lean on heavy load?

like WOT at 200kph? How lean is a little?

I prefer using TR6s on all my builds. N/A and FI

[competitionauto]

We have a 2012 Camaro with an LS3 that has a code p0300 that we can not get rid of. We have already went through the tables and turned off the code but the light still flashes after the vehicle idles for a while. This vehicle also has a healthy cam. Any other ideas?

[edcmat-l1]

We have a 2012 Camaro with an LS3 that has a code p0300 that we can not get rid of. We have already went through the tables and turned off the code but the light still flashes after the vehicle idles for a while. This vehicle also has a healthy cam. Any other ideas?

Post a tune and a data log. I've done tons of 5th gen Camaros with big cams and never had an issue.

[edcmat-l1]

hi guys,
I recently did a 2009 LS3 6L80E, updated with E-Force, LS9 camshaft, LG high flow headers and cat.
only on heavy load, at high speed (around 200 km/h or more) and heavy throttle, the engine set up a P0300
any good tip for me?
I didn't have a log

thank you

Chances are, if it's not a real misfire due to load, it's pulling a bunch of timing out, which will cause a misfire under load.

Data log and tune.........

[DSteck]

Data log and tune.........

First rule of fight club.