On my last two track events I have been getting the P0300 code. After the first event I took it to the shop and they found misfires on #4 and #7. All wires were checked as good and the spark plugs had no visual issues. They replaced all plugs and cleared the code. I had a track event yesterday and P0300 popped up at the end of session 2. I did notice my fuel tank was low. I filled up the tank, cleared the code and session 3 ran without any codes. Modifications are: LT1 bored and stroked to 416 cu, Texas speed cam, Callies dragon slayer 4" crank, cold air intake, and long tube headers. I do not feel any of the misfires. Any help would be appreciated. I don't know if I need to take it to another shop.

 

Mechanic said to not let fuel level go below half a tank as WOT or heavy braking may cause the pump to suck air throwing the codes. Any thoughts?

 

Just a couple of mods there amigo.... Has it only happened on track days?

 

Only happens at the track.
The car is really setup for track so I don't do much street driving with it. But it has never happened on street driving.
Fuel tank was low and either I was full throttle or braking heavily when the codes appeared. I have been trying to do some research on fuel starvation on the C7 but can't really find anything. I have other friends that have run on low fuel at the track without problems. So I am trying to find out if this is a problem with the C7.

 

Sounds like you have to figure it out or pay someone, put the engineering hat on. Curious, what shop did the 416?

 

Wegner Automotive in Wisconsin

 

Question - do you feel the engine idling rough in neutral, in gear/reverse?

P0300 means theres a general issue with one of the 4-strokes of the engine- Spark, Air, Fuel, Compression- usually the code will be directly for a cylinder (P0301 = cylinder 1) but if its isolated to just those you should check the air first- look at your intake make sure nothing is janky- clean the MAF, the throttle body. If nothing, move on to fuel, check the fuel injectors and run Seafoam through it. If this fails, run a compression test - this i've never done before but doesnt look too crazy if you are hands on.

If all else fails, bring it in. If you are under warranty, then dont even bother with all this unless youre interested in learning.
(I didn;t mention spark because it seems youve checked this- didnt look like you checked the coil pack/whatever the spark plug wires go into from the spark plug)

 

When it throws the code I really don't feel anything different, it runs fine. The only thing I notice is rev match does not work. The mechanic checked the wires, replaced plugs, and coil. They didn't go any further because everything seemed fine after they test drove.

 

Could be fuel injectors since it happens under heavy load.

Also always good to run seafoam through it, but since its only on pressure it sounds more like a fuel injector issue. Could have caused some overpressure on them to start misfiring in the cylinder for an incorrect A/F ratio.

 

You might want to try a Misfire Monitor Correction. Some of the aftermarket tune devices have this option.

 

Common track issue for some.....those who pull heavy cornering "G's" and hard thrush hole braking. I have had the same issue with a stock 718; so the rule is don't let fuel level drop below 1/4 full.....yours sounds like it needs to be a little higher.

 

Hey tletkewicz

Im from the Camaro 6 forum, I had a 2020 SS I just sold for a 2021 SS 1LE CPO that was a GM company car

I come from a Motorsports background i raced for 9 years, so I def try to pull all I can out of the car in the corners and I show up with less than 1/2 tank for weight.

At my first track day with the 1LE which was at Homestead Miami speedway, I got P0300, shaking stumbling, misfiring, service rear axle, service stabilitac etc. This happened after the 3rd consecutive left turn in a row (turn 3) and i pulled in. Reset the battery cooled the car off and went back out, it happened again this time in turn 1, a fast 105mph left kink. reset the battery again drove home no issues.

Took it to the dealer they had it for 5 days couldn’t find anything wrong, Told me it could be my CAI (which i thought was ridiculous being it was on my regular SS no prob) and that I should try running with more fuel (I told them i had 1/4 tank)

I pulled the CAI off and went to a track day 5 days after the first one. Showed up with over 3/4 tank, ran all day no issues. Super hot day, ran longer than normal sessions. Thought it must have been a fluke at homestead or the intake.

Fast forward to 06/22, first session goes well, had about 3/8 tank, second session, again on a left turn, a 95mph left kink, flashing CEL p0300 etc

the only similarity between these incidents is left turns and 1/4 tank of fuel

Ive been searching my *** off for fuel starvation relating to the corvette/camaro on track and couldn’t find anything

I think me and you might have found our issue

 

I'm wondering if the OP has the Z51 package...

 

What difference do you think that would make?
wondering bc a 1le is similar to a z51
mag ride, eLSD, ptm modes, lt1 etc

 

I'm not entirely sure other than the fact that the Z51 package was intended to make the Corvette more track-ready, for example, it upgrades the Vette to the Dry Sump oil system, larger overall brakes, and (although I think I may be mistaken) different ratios.

 

yeah and the 1le was supposed to make the Camaro more track ready, but my regular SS had zero problems and this thing has P0300 2 out of 3 track days hahaha

interested to see if OP has had this problem since? And if fuel level was his issue?

I don’t believe there is fuel system differences between C7 z51 and C7 Stingray but I could be wrong

 

I have a GS. Since getting this code, I took my car to the shop that installed the 416 engine. They made an adjustment so that the racing cam that I have will communicate with the fuel system better. The shop told me that every car needs to be tweak a bit so that all systems communicate more efficiently.

Since this adjustment, I have run 4 track days without any issues. Each track session is usually 20 minutes and I start with about 3/8 tank of gas (trying to improve lap times). I run my car pretty hard each session and at the end of the session the tank is almost empty. So I think fuel starvation was not the issue. I will see how the rest of the track season goes (next track event is July 3, 4).

Again, the shop associated my code with the programming of the cam and so far that seems to be true. Not sure what would be causing yours but I sympathize with you because when I kept getting the code it was very frustrating.

 

damn.. yeah mines stock. Appreciate the reply