Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel. - Page 11 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

GMRULZ · 08-26-2009, 04:59 PM

Quote:

Originally Posted by irpq11

Hmmmmmmmm, going back to my dyno thread, I wonder what mine would read now?

Only 1 way to find out....

Back to the dyno with you..

PQ · 08-26-2009, 05:02 PM

Quote:

Originally Posted by wh0rsep0wer

Some LS3's have reported that the fuse pull "patch" helps them. I did it last night with my LS3 and haven't noticed any real difference, but then again I never felt like the power was ever lacking.

You actually NEED it to re-learn everything to fix the problem (if yours is affected). If it's not affected, it will not hurt a thing...like I said before the effect is NO DIFFERENT than disconnecting the battery for a few hours or recovering from a dead battery...only by pulling these two fuses you don't have the annoying side effects (having to reset the window indexing, tone settings, etc.) because the BCM module and the radio never lose power...

Not exactly true. I disconnected my battery on two seperate occasions and left it disconnected all night long. It did nothing for the problem.

This is why I dismissed the fuse pull. Scott basically called me and MADE me do it. (he said if I didn't he would not be my buddy no more

)

Had I not done it, my dealer would have a few days later because GM TAC called them and told them to. Only difference is here on the forum we would have had to wait for someone else to do it because the dealer would have done the reset from the inside.

DaddySS · 08-26-2009, 05:13 PM

This is great stuff! It is so great to learn that irpq11 and scott@bjorn's cars have been "revived". If this is just a problem where certain ECMs are missing the code to check knock versus octane table in order to revert back then the good news is that it will be an easy "repush" of the software to the ECMs fix. If it's because some sensor is causing problems and preventing the relearn then it may take a little longer to figure out how and why but either way, it's great to know that the cars are not inherently faulty or underpowered.

c0rsa180 · 08-26-2009, 05:27 PM

Well I tired it on my LS3, i havent had a chance to really open it up yet but I can say I get a nice chirp going into second that I never really got before (happened at least 3 times in a row, and it generally never happened prior to this), and it really cant hurt to do this so I would recommend even if you feel the car is performing as advertised (i felt mine was) to just give it a try...

Bonemaro · 08-26-2009, 05:50 PM

I have an LS3 and pulled mine at 5:30 pm est, it's 6:45 now. Think i'll wait a couple more hours then off i go......

btw thanks for the info!

3BVert · 08-26-2009, 05:54 PM

Does anyone know if the computer will throw a code from doing this (ECM malfunction, ECM loss of communication, etc.)? Not that it really matters (I did it anyway) but just wondering. I know in our C5 you can have the DIC display stored codes. I don't guess the Camaro has a "hidden" feature like that, does it?

Kudos guys! Great thread!

DDustiNN · 08-26-2009, 06:52 PM

Quote:

Originally Posted by 3BVert

Does anyone know if the computer will throw a code from doing this (ECM malfunction, ECM loss of communication, etc.)? Not that it really matters (I did it anyway) but just wondering. I know in our C5 you can have the DIC display stored codes. I don't guess the Camaro has a "hidden" feature like that, does it?

Kudos guys! Great thread!

Forgive my lack of knowledge, but what does "throw a code" mean? Is this like something that shows up on a dealer's software during an inspection or something?

3BVert · 08-26-2009, 07:20 PM

Quote:

Originally Posted by DDustiNN

Forgive my lack of knowledge, but what does "throw a code" mean? Is this like something that shows up on a dealer's software during an inspection or something?

I'm no expert. I only know what the forums teach me

but the onboard computer can store codes that can be used for diagnostics. For example, here are some of the C5 codes:

B0851 Battery 1 Out of Range
B0856 +5 Volt Reference Out of Range
B1000 ECU Malfunction
B1001 Option Configuration Error

In the C5 Corvette, you can see code history and current codes by entering a specific sequence of buttons for the DIC. Service techs can read them by using an OBD (On Board Diagnostics I think) reader. See http://www.OBD-Codes.com for more info.

ls2gto · 08-26-2009, 07:58 PM

Quote:

Originally Posted by irpq11

Not exactly true. I disconnected my battery on two seperate occasions and left it disconnected all night long. It did nothing for the problem.

This is why I dismissed the fuse pull. Scott basically called me and MADE me do it. (he said if I didn't he would not be my buddy no more

)

Had I not done it, my dealer would have a few days later because GM TAC called them and told them to. Only difference is here on the forum we would have had to wait for someone else to do it because the dealer would have done the reset from the inside.

Okay, now you have me con-fuse-d and that is intended to be a pun. If Scott S. specifically told you to pull the fuses and not disconnect the battery, then I assume there is a capacitor that holds the charge on the ECM even if the battery is disconnected all night, but which is discharged if the fuses are pulled, which then forces the ECM to reset.

N2008T · 08-26-2009, 08:14 PM

I pulled the fuses last night and drove car this afternoon. I could never spin the tires before and let up on it today so I would not just burn them up. It also idles smoother. I thought it just was the cam because my 07 Vette with L99 ran the same. I picked up car right off carrier and drove it only .25 mile to fill with 93 octane were did my car learn this poor map it had that the fuse pull made better?

ls2gto · 08-26-2009, 08:26 PM

Quote:

Originally Posted by N2008T

I pulled the fuses last night and drove car this afternoon. I could never spin the tires before and let up on it today so I would not just burn them up. It also idles smoother. I thought it just was the cam because my 07 Vette with L99 ran the same. I picked up car right off carrier and drove it only .25 mile to fill with 93 octane were did my car learn this poor map it had that the fuse pull made better?

2007 Vette had an LS2, not the L99 which is only available in the 2010 Camaro.

PQ · 08-26-2009, 08:34 PM

Quote:

Originally Posted by ls2gto

Okay, now you have me con-fuse-d and that is intended to be a pun. If Scott S. specifically told you to pull the fuses and not disconnect the battery, then I assume there is a capacitor that holds the charge on the ECM even if the battery is disconnected all night, but which is discharged if the fuses are pulled, which then forces the ECM to reset.

Just want to specify that Scott S. in this case is Scott Sherman (Scott@bjorn3d) and NOT Fbodfather.

I'm assuming that the battery backup charge is before the fuses in the line. All I know is that a battery disconect didn't reset the right thing.

Quote:

Originally Posted by N2008T

I pulled the fuses last night and drove car this afternoon. I could never spin the tires before and let up on it today so I would not just burn them up. It also idles smoother. I thought it just was the cam because my 07 Vette with L99 ran the same. I picked up car right off carrier and drove it only .25 mile to fill with 93 octane were did my car learn this poor map it had that the fuse pull made better?

First, your 07' Vette didn't have an L99 in it, but a true LS3. The L99 is new with a different cam and AFM and such. (help me guys if I screwed that up)

But as far as what told your car to run on the low fuel table I wondered this about mine but I was able to assertain that my dealer put 3 gallons of 89 in my car off the truck. If you took yours off the truck and it never left your sight then your guess is as good as anyones.

Bonemaro · 08-26-2009, 09:05 PM

Well i'm back after my test run and it seemed to make a difference. It's going to take me a few drives to rule out the placebo effect, but i do feel like; much to my excitement, the car was more responsive than before.

Blueclyde · 08-26-2009, 09:11 PM

OK. Call me the skeptic of this group but I just pulled my fuses. I have a 50 mile drive tomorrow morning to take the car in for a new axle back system, so I will get a chance to see if there is a difference. I knew my car came from the dealer with a tank of 87 octane (bone heads) so I REALLY babied it until it was gone. I would be surprised if I got into any knock based retard/learn but we will see. I have also put about 4 tanks of 93 octane through it since and still can't understand why this system wouldn't have learned back. I would be ABSOLUTELY SHOCKED if doesn't. That would be a major strategy flaw in the control system that I doubt exists. If I notice a difference I will fall on my sword and tell you all.

This is still a great thread with some very interesting perspectives.

08-26-2009, 05:27 PM	#144
c0rsa180 Drives: 2010 Camaro SS/RS IOM Join Date: Jul 2008 Location: Long Island, NY Posts: 214	Well I tired it on my LS3, i havent had a chance to really open it up yet but I can say I get a nice chirp going into second that I never really got before (happened at least 3 times in a row, and it generally never happened prior to this), and it really cant hurt to do this so I would recommend even if you feel the car is performing as advertised (i felt mine was) to just give it a try... __________________ Inferno Orange Metallic 2SS RS M6 ordered 2/17/09

08-26-2009, 05:54 PM	#146
3BVert Drives: 2010 Camaro 2SS/RS Join Date: Jun 2009 Location: USA Posts: 380 View My Garage	Does anyone know if the computer will throw a code from doing this (ECM malfunction, ECM loss of communication, etc.)? Not that it really matters (I did it anyway) but just wondering. I know in our C5 you can have the DIC display stored codes. I don't guess the Camaro has a "hidden" feature like that, does it? Kudos guys! Great thread! __________________ 2SS/RS Red Jewel Tintcoat 6-Speed Automatic

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08-26-2009, 05:13 PM	#143
DaddySS Kept The Faith Drives: 2011 Camaro SS Convertible Join Date: Jan 2007 Location: Bergen County, New Jersey Posts: 418	This is great stuff! It is so great to learn that irpq11 and scott@bjorn's cars have been "revived". If this is just a problem where certain ECMs are missing the code to check knock versus octane table in order to revert back then the good news is that it will be an easy "repush" of the software to the ECMs fix. If it's because some sensor is causing problems and preventing the relearn then it may take a little longer to figure out how and why but either way, it's great to know that the cars are not inherently faulty or underpowered.

08-26-2009, 05:50 PM	#145
Bonemaro Drives: 2010 RJT 1SS M6 Join Date: Jul 2009 Location: Ann Arbor, Mi. Posts: 1,692 View My Garage	I have an LS3 and pulled mine at 5:30 pm est, it's 6:45 now. Think i'll wait a couple more hours then off i go...... btw thanks for the info!

08-26-2009, 08:14 PM	#150
N2008T Drives: 2SS RS Auto Join Date: Aug 2009 Location: Sanford FL Posts: 27	I pulled the fuses last night and drove car this afternoon. I could never spin the tires before and let up on it today so I would not just burn them up. It also idles smoother. I thought it just was the cam because my 07 Vette with L99 ran the same. I picked up car right off carrier and drove it only .25 mile to fill with 93 octane were did my car learn this poor map it had that the fuse pull made better?

08-26-2009, 09:05 PM	#153
Bonemaro Drives: 2010 RJT 1SS M6 Join Date: Jul 2009 Location: Ann Arbor, Mi. Posts: 1,692 View My Garage	Well i'm back after my test run and it seemed to make a difference. It's going to take me a few drives to rule out the placebo effect, but i do feel like; much to my excitement, the car was more responsive than before.

08-26-2009, 09:11 PM	#154
Blueclyde Drives: 2023 ZLE Join Date: Jun 2009 Location: Detroit Posts: 1,717	OK. Call me the skeptic of this group but I just pulled my fuses. I have a 50 mile drive tomorrow morning to take the car in for a new axle back system, so I will get a chance to see if there is a difference. I knew my car came from the dealer with a tank of 87 octane (bone heads) so I REALLY babied it until it was gone. I would be surprised if I got into any knock based retard/learn but we will see. I have also put about 4 tanks of 93 octane through it since and still can't understand why this system wouldn't have learned back. I would be ABSOLUTELY SHOCKED if doesn't. That would be a major strategy flaw in the control system that I doubt exists. If I notice a difference I will fall on my sword and tell you all. This is still a great thread with some very interesting perspectives.