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

[PQ]

I can't see any reason why. But it won't hurt anything to be safe. You'll just have have to reset your window indexing.

[Scott@Bjorn3D]

Fues pull is all that is needed just leave them out at least 2-3 hours in my book.

[PQ]

Originally Posted by Scott@Bjorn3D

Fues pull is all that is needed just leave them out at least 2-3 hours in my book.

[ChaseN'Tail]

How do you really know if you got one of the cursed slow ones?? would it hurt to just go ahead and pull the fuses anyways???

[mlee]

Originally Posted by ChaseN'Tail

How do you really know if you got one of the cursed slow ones?? would it hurt to just go ahead and pull the fuses anyways???

Doesn't hurt to pull... if you want to be sure your dealer didn't put 89 in it go ahead... I took mine in for something else and they asked me if I had done the fuse pull. I said Yes and they said Good... saved them the time of doing it...

[robertway]

Originally Posted by robertway

Throwing myself into the mix. When I picked up the car (LS3) a couple weeks ago the dealer had filled it with 87, despite me telling them not to. Anyway, drove through the entire tank of regular, ran through a full tank of 91 this past week until it was almost bone dry, just filled up last night and when I go t to work this morning I pulled the 5 and 20 fuses. Figure it will sit for a good 6-7 hours before I fire it up this afternoon. I have been breaking the car in hard over the past week as per the Darin Morgan break-in thread. The car hasn't really seemed to be "peppy" at partial throttle but has solid pull at WOT so halfway home during my 96 mile commute home from work I'll drop off the interstate a few time and then get on it hard getting back on to see how things are. She is definitely herky jerky in the morning just running through the first few gears early in the morning and I too figured it was just because it wasn't warmed up but yesterday I noticed it was a bit jerky even after up to temp. The again it could be my getting use to the clutch and a tendancy to "ride the mechanical bull" Lucky for me, I have a gas station right outside my development that has 93 octane as everthing else in the area is 91.

One question I have because I didn't have time to read the ENTIRE thread, I see the title has been changed to "LS3 needs battery disconnect", is this actually the case with the LS3 or is the fuse pull sufficient. Sorry to have to ask this but trying to get through 25 thread pages for the definitive answer while in a meeting at work with folks asking you questions is tough, telling them to pipe down because I am reading the fuse pull thread doesn't go over to well

First of all... yes, I quoted myself, now that that is out of the way

Threw the fuses back in yesterday afternoon when leaving work, they were out about 6-7 hours. Fired her up and she felt and sounded like she was idling smoother and when I started to roll out the herky jerkies were not there. Now I don't know if I magically got better at the clutch while in the office on this particular day but I don't thing so. On the way home I was able to get almost 25mpg for the whole trip where previous to the pull I was getting about 22 and she did seem a bit more peppy at partial throttle, I noticed this mostly in 6th gear on the interstate where I noticed it didn't "lug" as much trying to pass someone on 6th, again, maybe just placebo.

Now the interesting thing is on the way to work this morning I left early to make sure there was no traffic so I could do a nice steady run at highway speed to try to see if I could maximize my highway mileage. To my surprise, for my 95 mile trip, of which about 90 are on the interstates, I only managed 21.9mpg, three less than yesterday's drive home of almost 25mpg and a trip that I did hit some patches of bumper to bumper and even dropped of the interstate to enter back on to be able to "get on it" and run it through some gears hard getting up to highway speed.

So now I am confused, it seems the fuse pull cleared the octane tables as I had a tank of 87 from the dealer so can almost guarantee I was running off the low octane table, the absence of the herky-jerkies, the better mpg on the way home yesterday, and the peppier partial throttle response all pointed at running on the higher octane tables. So why the mpg results I saw this morning, starting out from the house there were no herky jerkies at all rolling out of the neighborhood cold, driving around the parking facilities at work she seemed to have slipped back into mechanical bull mode although some of that may still be me.

My only theory is that the 87 that was in the dealer was not totally run out of the tank enough, I think I let it run down to about 1/4 tank not actually having gone down to vapors, filled it with 91, ran that down to a 1/4 tank, filled it with 91 again, drove it to work, then pulled the fuses. Is it still possible there was enough 87 in there to dilute the 91 down enough that the computer dropped to the low octane table again? In any event, I'm gonna run this tank down to almost vapors even if I have to circle the gas station for an hour until I coast in then I'm going to fill it with 93 and pull the fuses again overnight and then do the steady cruise to work to try and maximize mileage.

[Scott@Bjorn3D]

Yes, a quarter of a tank would probably drop it low enough to go to the low tables again.

[robertway]

Originally Posted by Scott@Bjorn3D

Yes, a quarter of a tank would probably drop it low enough to go to the low tables again.

Ok, so that at least eliminates that I may be paranoid. As an aside Scott, I am glad to see things have been working themselves out that you have been able to hold onto the Camaro, you and your family have been in my families prayers.

Thanks for the info..

[PQ]

Originally Posted by robertway

First of all... yes, I quoted myself, now that that is out of the way

Threw the fuses back in yesterday afternoon when leaving work, they were out about 6-7 hours. Fired her up and she felt and sounded like she was idling smoother and when I started to roll out the herky jerkies were not there. Now I don't know if I magically got better at the clutch while in the office on this particular day but I don't thing so. On the way home I was able to get almost 25mpg for the whole trip where previous to the pull I was getting about 22 and she did seem a bit more peppy at partial throttle, I noticed this mostly in 6th gear on the interstate where I noticed it didn't "lug" as much trying to pass someone on 6th, again, maybe just placebo.

Now the interesting thing is on the way to work this morning I left early to make sure there was no traffic so I could do a nice steady run at highway speed to try to see if I could maximize my highway mileage. To my surprise, for my 95 mile trip, of which about 90 are on the interstates, I only managed 21.9mpg, three less than yesterday's drive home of almost 25mpg and a trip that I did hit some patches of bumper to bumper and even dropped of the interstate to enter back on to be able to "get on it" and run it through some gears hard getting up to highway speed.

So now I am confused, it seems the fuse pull cleared the octane tables as I had a tank of 87 from the dealer so can almost guarantee I was running off the low octane table, the absence of the herky-jerkies, the better mpg on the way home yesterday, and the peppier partial throttle response all pointed at running on the higher octane tables. So why the mpg results I saw this morning, starting out from the house there were no herky jerkies at all rolling out of the neighborhood cold, driving around the parking facilities at work she seemed to have slipped back into mechanical bull mode although some of that may still be me.

My only theory is that the 87 that was in the dealer was not totally run out of the tank enough, I think I let it run down to about 1/4 tank not actually having gone down to vapors, filled it with 91, ran that down to a 1/4 tank, filled it with 91 again, drove it to work, then pulled the fuses. Is it still possible there was enough 87 in there to dilute the 91 down enough that the computer dropped to the low octane table again? In any event, I'm gonna run this tank down to almost vapors even if I have to circle the gas station for an hour until I coast in then I'm going to fill it with 93 and pull the fuses again overnight and then do the steady cruise to work to try and maximize mileage.

So then by the math, You could theoretically still have 10% or so low grade in it. I'm thinking run that baby dry. Fill it up, run it dry again and fill it up.

[The 305]

I have the fuses out now. Will update tomorrow with results. 2SS LS3.

Dumb question real quick, does it matter which way the fuses go back in?

I can tell from the photo, just curious...

[Camar0wn3d]

Nope, doesn't matter which direction, as long as they are the correct Amp rating and in the correct spot, you're good.

[Scott@Bjorn3D]

Originally Posted by robertway

Ok, so that at least eliminates that I may be paranoid. As an aside Scott, I am glad to see things have been working themselves out that you have been able to hold onto the Camaro, you and your family have been in my families prayers.

Thanks for the info..

Working 3 jobs but I still have her.

[Michael Williamson]

Since I have a Hypertech Computer Programmer installed, will this mess up my programming if I remove the fuses?

[robertway]

Originally Posted by robertway

First of all... yes, I quoted myself, now that that is out of the way

Threw the fuses back in yesterday afternoon when leaving work, they were out about 6-7 hours. Fired her up and she felt and sounded like she was idling smoother and when I started to roll out the herky jerkies were not there. Now I don't know if I magically got better at the clutch while in the office on this particular day but I don't thing so. On the way home I was able to get almost 25mpg for the whole trip where previous to the pull I was getting about 22 and she did seem a bit more peppy at partial throttle, I noticed this mostly in 6th gear on the interstate where I noticed it didn't "lug" as much trying to pass someone on 6th, again, maybe just placebo.

Now the interesting thing is on the way to work this morning I left early to make sure there was no traffic so I could do a nice steady run at highway speed to try to see if I could maximize my highway mileage. To my surprise, for my 95 mile trip, of which about 90 are on the interstates, I only managed 21.9mpg, three less than yesterday's drive home of almost 25mpg and a trip that I did hit some patches of bumper to bumper and even dropped of the interstate to enter back on to be able to "get on it" and run it through some gears hard getting up to highway speed.

So now I am confused, it seems the fuse pull cleared the octane tables as I had a tank of 87 from the dealer so can almost guarantee I was running off the low octane table, the absence of the herky-jerkies, the better mpg on the way home yesterday, and the peppier partial throttle response all pointed at running on the higher octane tables. So why the mpg results I saw this morning, starting out from the house there were no herky jerkies at all rolling out of the neighborhood cold, driving around the parking facilities at work she seemed to have slipped back into mechanical bull mode although some of that may still be me.

My only theory is that the 87 that was in the dealer was not totally run out of the tank enough, I think I let it run down to about 1/4 tank not actually having gone down to vapors, filled it with 91, ran that down to a 1/4 tank, filled it with 91 again, drove it to work, then pulled the fuses. Is it still possible there was enough 87 in there to dilute the 91 down enough that the computer dropped to the low octane table again? In any event, I'm gonna run this tank down to almost vapors even if I have to circle the gas station for an hour until I coast in then I'm going to fill it with 93 and pull the fuses again overnight and then do the steady cruise to work to try and maximize mileage.

Re-quoting for the purposes of establishing a documentary... or something like that. anyway....

Riddle me this Batman... after all of the above, I ran the tank of 91 and some smaller percentage of 87 all the way down, I mean all the way down, rolled into the gas station after having been "low fuel range" for about 40-45 miles before rolling in to fill up. I filled up with 93, lucky enough to have a station right outside the neighborhood with 93. She took 17.56 gallons so there was just one gallon of fuel that over the past couple weeks is roughly one part 87 and two parts 91 (tank of 87 from dealer and two tanks of 91 from me). After the 17.56 gallons of 93 I would venture to say I have a full tank of 92.6 at worst

Pulled the fuses last night and left them out until I was heading out for work this morning, left early enough for NO traffic on my 90+ mile interstate commute and intended to light-foot it all the way to work cruising at about 70-75mph to try and maximize MPG. The result..... 21mpg.. WTF!!!!!!!! That's not even close to the 24mpg the friggin car is rated at. When I say I light-footed it, I even took my foot totally off the gas going down all the huge hills on the interstate. This leads me to one final attempt and that is to not only pull the fuses again tonight but also disconnect the battery, I may even pull a couple wheels off the car if it will help as well as sleep with my boxers on inside out (what effect that has I have no idea but my kids wear their jammies inside out to try to get it to snow and it friggin works every time...)

I am thinking there is more truth to the title of the thread where is says LS3's needs a battery disconnect. I'll try again tonight and report back once again. As an aside, am I trying to draw blood from a stone here, is 22mpg cruising on the interstate what is to be expected when GM specs rate it at 24, I have seen folks reporting over 25 and in some cases 27-28mpg but I am wondering of that is for the L99 and the cylinders shutting down a lot.

Yes I know I bought a V8 and shouldn't care about mileage and for the most part don't but want to make sure the car is using the high octane table so when I am shooting for 8mpg on the back roads I am getting the most bang for my buck