Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel.

[PQ]

Originally Posted by Gizz69

I stopped at my dealer today, and they had no idea what I was talking about until I gave them this information. Couple of things to note:
This is for 2010 L99 Camaros. The fuses to pull for the 2011 are 5 and 20, not 13 and 20 as stated above.
According to the dealer, this should take less than 30 minutes but is not a permanent fix either. If you somehow manage to get low octane gas in the engine you will be right back where you started.

I guess it is worth a shot, and make sure you just put in the good stuff moving forward. I think ultimately, the only way to do it right is going to be to get an after-market tune that removes the possibility of two fuel maps completely.

These engines are built like tanks. I don't see why GM is so scared of letting them do what they are designed to.

It's the 5 and 20 on the 2011 and 2010s so I'm not sure either. But you're right. There is no permanent fix other than a tune. Again, I think GM prefers it the way it is.

[Fourth Camaro]

Originally Posted by PQ

It's the 5 and 20 on the 2011 and 2010s so I'm not sure either. But you're right. There is no permanent fix other than a tune. Again, I think GM prefers it the way it is.

That would be disappointing to me, but not the end of the world. They'll get very tired of me coming in there if it keeps reverting, and it has been reverting even though I have not used less than Shell or BP premium fuel since August of 2009.

I'm also wondering why my receipt shows "Software Update Reprogram ECM per TSB #PIP4728."
That wording does not indicate "we turned everything off and restarted it" to me, but again, it's progress.
We'll see I guess.

[Fourth Camaro]

I have been checking on this issue with dealers, and then finally, Monday, there was a bulletin dated November 4, 2009. I was in there last July and that bulletin didn't exist.
In my mind, there is at least a chance that they finally figured out they needed to do something, did it, and made it available.

Fingers crossed. What else can ya do?

[PQ]

Originally Posted by Fourth Camaro

That wording does not indicate "we turned everything off and restarted it" to me, but again, it's progress.
We'll see I guess.

NO doubt.

But, I say again, it's better than it used to be. Where if your car required high octane, and you used low, it could damage your engine because there was no retarding of the timing. AND at least we can fix it at home.

But that's what I'm saying. GM will save a ton in warranty claims becasue 90% of SS owners wont' even know the difference.

Hell, before the fuse pull thing, there were people on here telling me I was crazy. That I 'should have bought the LS3' or I need to learn how to drive my car.

When I finaly was forced to pull my fuses, and blew this thing wide open, I had guys PMing me their new time slips and appolagizing.

Bottom line is it's perfect for GM right now. They have an easy low to no cost reset and they have a ton of underpowered cars NOT stressing from 400+ HP.

[PQ]

Oh, and it explains why so many are just not impressed. Why so many Mustangs and Challengers are killing the stock SS Camaros light to light. Espec, the L99s, that make their mark and are faster 0-60mph. That's where the red light races are won. 0-60mph is the general gauge on how bad ass the car is out on the streets. Becasue that's where the most races happen. Leave the stop light, accelerate to 55 or 60 and guage each other like that.

Quarter mile runs are done on the track, and maybe 3% of car owners ever make it to the track.

These cars get a bad gauge form most becasue most of our SSs are underpowered suffereing from low spark timing.

[BigCarrot]

Wow I'm so glad I read this thread... I'm doing this tonight. Even though I have a LS3 I'm having similar Idling problems because of the lower octance gas was used. Hopefully the problems will be fixed in the morning!

[D Day Dog]

So the best way to do the reset if you ended up using low octane gas would be to let your car run the tank almost out with the low octane gas - fill it up with the highest octane 91+ that you can (so the car doesn't sense any low octane fuel) - and then drive home and do the fuse pull and reinsert the next a.m. ?

BTW: 90 is the best octane I can get here in Anchorage, so it looks like I will have to boost it with an additive to get to 93 - any suggestions?

[Hulk]

Originally Posted by D Day Dog

So the best way to do the reset if you ended up using low octane gas would be to let your car run the tank almost out with the low octane gas - fill it up with the highest octane 91+ that you can (so the car doesn't sense any low octane fuel) - and then drive home and do the fuse pull and reinsert the next a.m. ?

BTW: 90 is the best octane I can get here in Anchorage, so it looks like I will have to boost it with an additive to get to 93 - any suggestions?

Yes that is correct. I did a second fuse pull on mine after I filled up for the second time with 91 (highest we can get). As for additives I do not know what is the best any more. I say try what you can get and see if it makes a difference after the fuse pull.

[D Day Dog]

Originally Posted by Hulk

Yes that is correct. I did a second fuse pull on mine after I filled up for the second time with 91 (highest we can get). As for additives I do not know what is the best any more. I say try what you can get and see if it makes a difference after the fuse pull.

Thanks !!!

[windzurfer]

For the record, its not good practice to take the tank down to E. U should always refill before 1/8. This keeps the pump and filter in better shape.

[cardsfan09]

I've read through this thread and one thing I haven't seen anyone ask is, can onstar diagnostics tell you whether you car is running on the low or high octane fuel timing mapping???? Might jsut have to push the button and ask tomorrow, I'll let you know what they say.

[Scott@Bjorn3D]

Originally Posted by PQ

NO doubt.

But, I say again, it's better than it used to be. Where if your car required high octane, and you used low, it could damage your engine because there was no retarding of the timing. AND at least we can fix it at home.

But that's what I'm saying. GM will save a ton in warranty claims becasue 90% of SS owners wont' even know the difference.

Hell, before the fuse pull thing, there were people on here telling me I was crazy. That I 'should have bought the LS3' or I need to learn how to drive my car.

When I finaly was forced to pull my fuses, and blew this thing wide open, I had guys PMing me their new time slips and appolagizing.

Bottom line is it's perfect for GM right now. They have an easy low to no cost reset and they have a ton of underpowered cars NOT stressing from 400+ HP.

It is amazing that when I put my Glock to his head and said pull the fuses he finally listened.

[PQ]

Originally Posted by Scott@Bjorn3D

It is amazing that when I put my Glock to his head and said pull the fuses he finally listened.

[Scott@Bjorn3D]

ALSO, the LS3 has the same issue. LS3 owners did not complain as much since they can rev up and launch their cars. L99's that is not the case. But many here with LS3's have pulled their fuses and said it was crazy how much better their car was.