[SATINSTEEL1LE]

Here is my stock log showing my car warmed up idling fine with the LTFTs -12% to -13% but the short term fuel trims are perfect almost at zero. This means the car is completely happy and running correctly. At least in closed loop.

And the second photo is the log from my car with nothing but the rotofab added. No tune change or anything, still all completely stock same gas and everything. Here you can see the LTFTs are better. Closer to zero. More air going in means more fuel is needed and not as much pulled out from the factory airbox restriction. So the fuel trims are doing their job, and the shorties are still happy at zero-ish.

[ChevyTech77]

Long term trims at 10% isn’t anything to be concerned about. Also, these aren’t 1988 TPI small blocks, or worse. They are not going to hurt themselves from a little romp down the road and back to clean the plugs. It’s a known deal with these. Run them like they were intended to be run and there won’t be any issues like this.

[Bmhenry]

Originally Posted by SATINSTEEL1LE

Sorry thats not correct. The car has the ability to pull or add fuel +25% to -25%. Anything in between those means the car is doing what its supposed to do. Keeping stoich. If its pegged at -25% or +25% then yes your car is running rich or lean. This is all controlled in the tune. The fuel trims will try to keep the car running at stoich.

My stock stock ZL1 on 93 sits between -15% and -8%. That's not bad. Its just set rich in the tune from the factory. During closed loop, the car runs fine. But in open loop, this is why some can pick up mph by running e30 on a stock car/stock tune. They are able to lean it out safely and pick up HP in open loop(WOT) because the car doesnt use the fuel trims.

That makes sense. It’s just so weird the car sometimes bogs down while idling and still random misfires (according to my scanner it’s across most cylinders). It’s around 20 total for 10 minutes or so. I did that 300 mile driving and went pretty quick on a 8% grade for 6 miles. Also the fuel cleaners didn’t help.

[UnknownJinX]

Originally Posted by SATINSTEEL1LE

Sorry thats not correct. The car has the ability to pull or add fuel +25% to -25%. Anything in between those means the car is doing what its supposed to do. Keeping stoich. If its pegged at -25% or +25% then yes your car is running rich or lean. This is all controlled in the tune. The fuel trims will try to keep the car running at stoich.

My stock stock ZL1 on 93 sits between -15% and -8%. That's not bad. Its just set rich in the tune from the factory. During closed loop, the car runs fine. But in open loop, this is why some can pick up mph by running e30 on a stock car/stock tune. They are able to lean it out safely and pick up HP in open loop(WOT) because the car doesnt use the fuel trims.

It does, but usually, by the time you have more than 10% correction either way, you are having issues. My old Mazda3 had a pretty small vacuum leak and that's able to throw a CEL with about -18% LTFT.

And if we are talking specifically about the Camaro6, these are straight from the service manual. The 3rd column from the left indicates the "expected value".

Now realistically, I don't believe anyone's LTFT will sit right at 0%, but anything within 10% either way is generally fine if you look at most cars' service manuals.

It could be that OP's car just needs to be run hard, but again, I would just double-check everything else before trying the Italian Tune-up.

Usually, small leaks or restrictions will only show up at idle due to the low volume of air flow at idle.

[Bmhenry]

Originally Posted by ChevyTech77

Long term trims at 10% isn’t anything to be concerned about. Also, these aren’t 1988 TPI small blocks, or worse. They are not going to hurt themselves from a little romp down the road and back to clean the plugs. It’s a known deal with these. Run them like they were intended to be run and there won’t be any issues like this.

I cleaned the plugs and fuel injectors which is why I haven’t thought a rump down the road would help, and also I held the car at 3k rpm for several minutes by staying in 5th. But if harder driving is still the common thought to the most probable fix then I’ll make some fun drives to work.

[Gunkk]

The good ol' Italian tune-up ... yes it's still a thing.

Though I'd be looking for an air leak of I was running +10% trims consistently

[Bmhenry]

Originally Posted by Gunkk

The good ol' Italian tune-up ... yes it's still a thing.

Though I'd be looking for an air leak of I was running +10% trims consistently

It was -10%, and it’s not consistent anymore.

[6spdhyperblue]

A/C on and the load % changes the trims