Fuse Pull on LS3?

[Atomic Autosports]

Can someone explain the fuse pull theory for an LS3. How is this done and does it really work?

[Croathlete]

There's tons of threads on this, and one sticky I believe. Don't mean to sound like an @$$, but search the forum first...

EDIT: http://www.camaro5.com/forums/showthread.php?t=38964

[Atomic Autosports]

Originally Posted by Croathlete

There's tons of threads on this, and one sticky I believe. Don't mean to sound like an @$$, but search the forum first...

EDIT: http://www.camaro5.com/forums/showthread.php?t=38964

Well I did search and I can up with the same thread....its for an L99 not an LS3...I wont comment on your post anymore than that.

[Edrock]

Originally Posted by Atomic Autosports

Well I did search and I can up with the same thread....its for an L99 not an LS3...I wont comment on your post anymore than that.

Well...if you read that thread closely, you'll find several posts from LS3 owners that did the fuse pull too. I posted a couple of times with my results.

EDIT: Plus that thread will lead you to just about all the other threads on here about the subject...Prolly why it is a "Sticky" thread.

[Croathlete]

Originally Posted by Edrock

Well...if you read that thread closely, you'll find several posts from LS3 owners that did the fuse pull too. I posted a couple of times with my results.

Thank you Edrock. Sometimes if the first post doesn't answer their question, they give up right away.

[Scott@Bjorn3D]

Yep works well on LS3, I have a friend here in town Jerry that did his and he said it made a big difference. He thought his car was fast before but know he is realy happy.

[Edrock]

Originally Posted by Croathlete

Thank you Edrock. Sometimes if the first post doesn't answer their question, they give up right away.

Yep.

[Atomic Autosports]

Originally Posted by Croathlete

Thank you Edrock. Sometimes if the first post doesn't answer their question, they give up right away.

Yeah....wish I had more time to go thru 10 pages...just dont have that kind of time, consider yourselvs lucky.

[Camar0wn3d]

I posted this a while back...the theory for the LS3 is the same as the L99

Originally Posted by wh0rsep0wer

I tuned in HPTuners on my LS1 and if it is the same for an L99/LS3, this is what happens when you pull the fuses:

There are two tables values used for spark timing - high octane table and low octane table. If you use 93 octane from day one, your computer is using spark timing from the high octane table. If you got a tank of 87 from the dealer, the engine experienced premature detonation and the knock sensors went crazy, and told the computer to use the low octane timing table. What is supposed to happen is after a while of not seeing detonation from the knock sensors, the computer (ECU)tries the high octane spark timing table again. (This doesn't appear to be happening - THIS IS THE PROBLEM!!!!).

The values in the high octane and low octane tables are NON-VOLATILE MEMORY (meaning they are there even if you lose power -like when you do the fuse pull). These tables are usually adjusted when you get a custom tune, and burned into the non-volatile memory. So therefore if you get a custom tune YOU WILL NOT LOSE THESE "TUNED" VALUES with the fuse pull.

What WILL happen with the fuse pull is your volatile memory will be reset. This includes long term + short term fuel trims, knock retard, etc... but what is important in this case is the little parameter that determines which spark table to use will reset...meaning if you were running from the low octane tables before (safe + slow mode), after the fuse pull it will force the computer to try the high octane table again (super giggle fun happy rockin' mode).

However it is important to note that you shouldn't need to try the fuse pull if you've only used high octane gas since getting a custom tune, because burning the tune to the ECU resets all volatile memory. This is why it will go through the idle re-learn process and may run a little weird for the first 20 minutes or so after burning a tune or pulling the fuses.

Pulling the fuses is no different from recovering from a dead battery. The only reason I could see that it would be a problem to pull the fuses is if GM wanted to run diagnostics on the cars with the problem and needed to see the volatile values.

[ffrcobra_65]

Originally Posted by wh0rsep0wer

I posted this a while back...the theory for the LS3 is the same as the L99

Thank you! I got smarter today because of your post.

I have a LS3, I did the fuse pull 3 times. The 1st time, I left it for 4 hours, reinstalled and drove. I didn't feel any change.

2nd time, I pulled the fuses and left them out all night. Reinstalled them and drove. Noticeable difference. Engine was running smoother and throttle response improved.

3rd time, I pulled them after I installed R-F CAI. Left them out all night. Reinstalled and drove.

[Andro]

Just get a tune

[camaro692]

I pulled my fuses when I left for the morning, ill report my findings tonight! LS3

[rcracer78]

If I know for a fact that my dealer put 91 (93 not available in CA) in my LS3, should I try the pull?

[2SSRS@Gen5diy]

I did it 2 week age for the night and it made no improvement at all.