Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel. - Page 40 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

pikSkip · 11-03-2009, 07:00 PM

FYI: My L99 just turned 2000 miles. I have always noticed a startup "pop", but never gave it much thought. I also had a "sputter" around 1000-1250 revs but it disappeared beyond that point. I did the fuse pull last night and had no "pop" this morning and no "sputter" on the low end in "D". It ran a lot smoother and quicker today. A much smaller pop returned about every 4th start up throughout the day , but the performance increase has been very noticable. Thanks for the post. I thought I had a beast before yesterday, but now......

Alfieboy · 11-03-2009, 08:15 PM

Quote:

Originally Posted by towmoe

Now I'm confused... Are LS3 owners supposed to disconnect the battery or not

???????????????????????

acowherd · 11-03-2009, 08:58 PM

Quote:

Originally Posted by Alfieboy

???????????????????????

It won't hurt anything. Just re-index the windows and drive on.

acowherd · 11-03-2009, 09:07 PM

My fuse pull and battery disconnect was so-so. I feel the power is the same (was not complaining before the pull anyways)

I am no expert shifter, but i can drive a stick. The shifting feels better to me. The jerky takeoff is smoother. Call me crazy but it is different than before the pull.

Davis · 11-04-2009, 09:32 AM

Quote:

Originally Posted by acowherd

It won't hurt anything. Just re-index the windows and drive on.

Yeah it won't hurt anything, but I would like to know why we would have to disconnect the battery AND pull a fuse...

Scott@Bjorn3D · 11-04-2009, 10:40 AM

YOU DO NOT NEED TO DO THE BATTERY!! Ok good got your attention. Just do the fuse pull and let it sit for at least 1 hour. Guys want to be in a hurry and say pull the battery. GUESS WHAT, there is a ECM backup battery between the main battery and the ECM. So pulling the trunk battery has no effect on the ECM unless left for maybe over night. Then of coarse you have to mess with window indexing and stuff like that. Just do the fuse pull. Simple and easy.

PQ · 11-05-2009, 01:59 AM

Quote:

Originally Posted by Scott@Bjorn3D

YOU DO NOT NEED TO DO THE BATTERY!! Ok good got your attention. Just do the fuse pull and let it sit for at least 1 hour. Guys want to be in a hurry and say pull the battery. GUESS WHAT, there is a ECM backup battery between the main battery and the ECM. So pulling the trunk battery has no effect on the ECM unless left for maybe over night. Then of coarse you have to mess with window indexing and stuff like that. Just do the fuse pull. Simple and easy.

I pulled my battery overnight remember. It did nothing. So it would have to be longer than that.

Like Scott said. Pull the fuses. My vids are all the proof you need.

mnywstr · 11-05-2009, 03:12 PM

I tried the fuse pull yesterday on my LS3 and it seemed to help in it shifting more steadily. I really had a hard time shifting smoothly since I got the car a few weeks ago. I know how to drive stick since that is all I have owned for 20 years. Mileage seems to be going up too, have a half tank of gas and driving around town today I gained 2 mpg with me getting on it a few times. I only pulled the fuses for 3 hours and don't know if that was enough time.

Michael#1 · 11-05-2009, 07:40 PM

Quote:

Originally Posted by acowherd

My fuse pull and battery disconnect was so-so. I feel the power is the same (was not complaining before the pull anyways)

I am no expert shifter, but i can drive a stick. The shifting feels better to me. The jerky takeoff is smoother. Call me crazy but it is different than before the pull.

i swear my start off is smoother too

PQ · 11-07-2009, 01:43 PM

Quote:

Originally Posted by mnywstr

I tried the fuse pull yesterday on my LS3 and it seemed to help in it shifting more steadily. I really had a hard time shifting smoothly since I got the car a few weeks ago. I know how to drive stick since that is all I have owned for 20 years. Mileage seems to be going up too, have a half tank of gas and driving around town today I gained 2 mpg with me getting on it a few times. I only pulled the fuses for 3 hours and don't know if that was enough time.

That's plenty of time.

Halltech · 11-07-2009, 02:40 PM

I have tuned over 400 C6 Corvettes by Halltech's e-mailTune®, and always clone the High Octane table to the Low Octane table. This has never once presented a problem, and permanently resolves the timing issue. The ECM counts knock retard and at a specific threashold bumps you into Low Octane timing. Boy can you tell the loss of around 20 HP.

I have not read this lengthy thread, so if this has already been recommended or mentioned, sorry for the duplicate advice.

Folks always think of tuning as some kind of magical formula, when in reality, things like CAGS, Rev limit, Top speed limiter, timing tables, Cat Over Temp Protection, Air Fuel ratio improvement, torque management, and many other countermeasures to GM overly protective ECM measures are normally modified or turned off altogether. Headers many times require cat codes turned off due to the repositioning of the cats.

In 8 years of tuning, we have only had one set of cats smoked by turning off the Cat Overtemp Protection Circuit, which pukes fuel into the cylinders at around 9.9:1 air fuel ratio, and that was a customer who kept his pedal to the metal for 30 minutes flat out at the Salt Flats. He did 177 mph with his virtually stock C5, but ended up replacing his cats. Not surprisingly he then just cut them off.

Jim Hall

Gunsmoke · 11-08-2009, 04:33 PM

wow, im sorry but thats way too many pages to read. and im on my mobile at work, hehe. i have the ls3, is pulling the fuses overnight right? or/and battery? thanks!

losjohnny · 11-09-2009, 12:03 AM

Quote:

Originally Posted by Halltech

I have tuned over 400 C6 Corvettes by Halltech's e-mailTune®, and always clone the High Octane table to the Low Octane table. This has never once presented a problem, and permanently resolves the timing issue. The ECM counts knock retard and at a specific threashold bumps you into Low Octane timing. Boy can you tell the loss of around 20 HP.

I have not read this lengthy thread, so if this has already been recommended or mentioned, sorry for the duplicate advice.

Folks always think of tuning as some kind of magical formula, when in reality, things like CAGS, Rev limit, Top speed limiter, timing tables, Cat Over Temp Protection, Air Fuel ratio improvement, torque management, and many other countermeasures to GM overly protective ECM measures are normally modified or turned off altogether. Headers many times require cat codes turned off due to the repositioning of the cats.

In 8 years of tuning, we have only had one set of cats smoked by turning off the Cat Overtemp Protection Circuit, which pukes fuel into the cylinders at around 9.9:1 air fuel ratio, and that was a customer who kept his pedal to the metal for 30 minutes flat out at the Salt Flats. He did 177 mph with his virtually stock C5, but ended up replacing his cats. Not surprisingly he then just cut them off.

Jim Hall

Thanks for the additional info and support!

rudack · 11-09-2009, 11:14 AM

LS3 trying it today, hope to see something

11-03-2009, 07:00 PM	#547
pikSkip Drives: '69 VET, '70 Z28 Join Date: May 2009 Location: Toledo, OH Posts: 80 View My Garage	Successful Fuse Pulls FYI: My L99 just turned 2000 miles. I have always noticed a startup "pop", but never gave it much thought. I also had a "sputter" around 1000-1250 revs but it disappeared beyond that point. I did the fuse pull last night and had no "pop" this morning and no "sputter" on the low end in "D". It ran a lot smoother and quicker today. A much smaller pop returned about every 4th start up throughout the day , but the performance increase has been very noticable. Thanks for the post. I thought I had a beast before yesterday, but now...... __________________ 2010 Black/Beige 2SS/RS A6 SRoof (Cat-back SLP Loud Mouth II, CAI, Technostalgia Rapid Fire TL) CONO (Camaros of NW Ohio)

11-03-2009, 09:07 PM	#550
acowherd Drives: 2010 2ss/RS 4l80. 2009 2500 HD Join Date: Mar 2009 Location: Mid MO Posts: 1,826	My fuse pull and battery disconnect was so-so. I feel the power is the same (was not complaining before the pull anyways) I am no expert shifter, but i can drive a stick. The shifting feels better to me. The jerky takeoff is smoother. Call me crazy but it is different than before the pull. __________________ Follow along as we build and race this 2010 Camaro! https://www.facebook.com/pages/FNSS-...75028626000379 FNSS Racing!

11-07-2009, 02:40 PM	#557
Halltech Drives: 2010 Halltech Camaro SS, 2008 C6Z06 Join Date: Sep 2009 Location: Milwaukee, WI Posts: 363	ECM programming may void your warranty, but...... I have tuned over 400 C6 Corvettes by Halltech's e-mailTune®, and always clone the High Octane table to the Low Octane table. This has never once presented a problem, and permanently resolves the timing issue. The ECM counts knock retard and at a specific threashold bumps you into Low Octane timing. Boy can you tell the loss of around 20 HP. I have not read this lengthy thread, so if this has already been recommended or mentioned, sorry for the duplicate advice. Folks always think of tuning as some kind of magical formula, when in reality, things like CAGS, Rev limit, Top speed limiter, timing tables, Cat Over Temp Protection, Air Fuel ratio improvement, torque management, and many other countermeasures to GM overly protective ECM measures are normally modified or turned off altogether. Headers many times require cat codes turned off due to the repositioning of the cats. In 8 years of tuning, we have only had one set of cats smoked by turning off the Cat Overtemp Protection Circuit, which pukes fuel into the cylinders at around 9.9:1 air fuel ratio, and that was a customer who kept his pedal to the metal for 30 minutes flat out at the Salt Flats. He did 177 mph with his virtually stock C5, but ended up replacing his cats. Not surprisingly he then just cut them off. Jim Hall

11-09-2009, 11:14 AM	#560
rudack Rudack Drives: ABM 2SS/RS Join Date: May 2009 Location: Coconut Creek, FL Posts: 742 View My Garage	LS3 trying it today, hope to see something __________________ ABM 2SS/RS #33390

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11-04-2009, 10:40 AM	#552
Scott@Bjorn3D Drives: Kami, 2013 2SS LS3 Luvin Join Date: Oct 2008 Location: Eufaula, Alabama Posts: 6,427	YOU DO NOT NEED TO DO THE BATTERY!! Ok good got your attention. Just do the fuse pull and let it sit for at least 1 hour. Guys want to be in a hurry and say pull the battery. GUESS WHAT, there is a ECM backup battery between the main battery and the ECM. So pulling the trunk battery has no effect on the ECM unless left for maybe over night. Then of coarse you have to mess with window indexing and stuff like that. Just do the fuse pull. Simple and easy.

11-05-2009, 03:12 PM	#554
mnywstr Drives: 2010 Rally Yellow 2SS/RS Join Date: Sep 2009 Location: California Posts: 42	I tried the fuse pull yesterday on my LS3 and it seemed to help in it shifting more steadily. I really had a hard time shifting smoothly since I got the car a few weeks ago. I know how to drive stick since that is all I have owned for 20 years. Mileage seems to be going up too, have a half tank of gas and driving around town today I gained 2 mpg with me getting on it a few times. I only pulled the fuses for 3 hours and don't know if that was enough time.

11-08-2009, 04:33 PM	#558
Gunsmoke wat? Drives: 2010 Chevy Camaro SS RS Join Date: Oct 2009 Location: Las Vegas Posts: 176	wow, im sorry but thats way too many pages to read. and im on my mobile at work, hehe. i have the ls3, is pulling the fuses overnight right? or/and battery? thanks!