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

[T_MECO]

After keeping up with this thread for some time I decided it could not hurt to pulled the fuses. I have the V8 LS3 and the dealer told me they had put premium in it when I picked the car up. After 2500 miles - it seem still real jerky between 1-2 and 2-3 and at lower speeds. I figured it was me not being used to this new clutch (seeing how I have never driven a brand new car off the lot) and having not driven a manual in over ten years. It felt like if had some real power albeit I have been driving my truck for too many years (anything pulls faster than it).

So this morning - I am glad say that I am driving a different car. The shifting feels way smoother and accel is is beefer and it does not lug as much especially in 6th on the highway. I am about to fill up again with 93 oct tomorrow and I will see how the mpg is doing. I have been keeping up with every tank of gas I have put in her to compare against the Vehicle'ss estimate. The engineering in me has to put everything into EXCEL.

After another tank I'll come to a final verdict to wether it really has helped me out. But my first impression of driving this morning has been positive.

[mlee]

Originally Posted by T_MECO

After keeping up with this thread for some time I decided it could not hurt to pulled the fuses. I have the V8 LS3 and the dealer told me they had put premium in it when I picked the car up. After 2500 miles - it seem still real jerky between 1-2 and 2-3 and at lower speeds. I figured it was me not being used to this new clutch (seeing how I have never driven a brand new car off the lot) and having not driven a manual in over ten years. It felt like if had some real power albeit I have been driving my truck for too many years (anything pulls faster than it).

So this morning - I am glad say that I am driving a different car. The shifting feels way smoother and accel is is beefer and it does not lug as much especially in 6th on the highway. I am about to fill up again with 93 oct tomorrow and I will see how the mpg is doing. I have been keeping up with every tank of gas I have put in her to compare against the Vehicle'ss estimate. The engineering in me has to put everything into EXCEL.

After another tank I'll come to a final verdict to wether it really has helped me out. But my first impression of driving this morning has been positive.

Here's what I think is causing the Herky Jerkys

http://www.camaro5.com/forums/showthread.php?t=55166

[T_MECO]

thanks for the info! I'll be sure to take my car in to get an update as soon as I can.

Originally Posted by mlee

Here's what I think is causing the Herky Jerkys

http://www.camaro5.com/forums/showthread.php?t=55166

[robertway]

Originally Posted by robertway

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

Yesterday afternoon did the light foot test on the way home and managed a little over 24mpg for the 90+ mile interstate portion of trip in the 70-75 range, this was after only getting 21mpg on the way in so I don't know if it was headwind on the way in, tailwind on the way home, aliens, placebo, take your pick

Last night just decided to unplug everything, pulled 5 and 20 and disconnected the battery and lit it sit overnight. This morning on the ride it took my opportunities to drop off the interstate and and use the on ramp to see how she kicked and all I can say is something woke this car up because she was breaking loose in first even before hitting WOT and I have 315's in the rear. Now temps are quite cold here in Jersey at the moment so I am sure that helps with the tires breaking loose but earlier this week she wasn't breaking loose even at WOT. The herky jerkies are pretty much gone except for those induced by my getting used to the clutch. Definitely feels more responsive at partial throttle. On the way home I'll light foot it all the way and see what kind of mpg I can pull. Either way, I think at least I am back on the high octane table which is all I was concerned about.

[terryzx]

Is this fuse pull just specific for the Camaro or will it also work on a C6 Corvette?

[Fourth Camaro]

Originally Posted by robertway

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.

Has something changed or is it still fuel that keeps the fuel pump from overheating?
I might be wrong, but I don't think it's ever a good idea to get low on fuel.

Make GM solve this octane table problem.

[Darth_Emma]

robertway:
I see you live in NJ. We had some rough winds this week and I wonder if perhaps those trips you had the lower fuel economy that perhaps you were running into a headwind. Just a thought.

I have read most of this thread and I will be getting my L99 Camaro in a few weeks. (The wait is killer!) I read the instructions on the fuse pull. If I ask my dealer to do this as part of the PDI, and they fill it with 93 octane gas (the station across the street from them has it), will that mean I don't have to do this myself later on if I always run 93 octane in it? Thanks.

[PQ]

Maybe I'm wrong. I very well meay be. I'm not an engineer, but I don't see how an LS3 could require a battery pull along with the fuse pull also. I did the fuse pull because we reallized that there was a backup between the battery and the fuse box. (and of course because Scott threatened me if I didn't)

Mine is still running very well.

I averaged 26.3 mpg for approx. 250 miles on our way to Houston. Yes, I set the counter after I was allready cruising at speed, and looked at it before I got off the interstate and had to accelerate again, but it was still damn good. I had Bonnie, James, and Rebecca in the car as well.

Can someone verify the backup power location? My battery pull did nothing but froce me to reset all my settings. The fuse pull fixed the problem and I never had to reset anything.

[robertway]

Originally Posted by Fourth Camaro

Has something changed or is it still fuel that keeps the fuel pump from overheating?
I might be wrong, but I don't think it's ever a good idea to get low on fuel.

I would agree it is not a good idea to run around with low fuel all the time, but I did want to run it real low once so I could get an almost full tank of 100% 93 octane, there was still about a gallon in the tank so I don't know how low you actually have to go before heat would become an issue with the fuel pump

Originally Posted by Darth_Emma

robertway:
I see you live in NJ. We had some rough winds this week and I wonder if perhaps those trips you had the lower fuel economy that perhaps you were running into a headwind. Just a thought.

I have read most of this thread and I will be getting my L99 Camaro in a few weeks. (The wait is killer!) I read the instructions on the fuse pull. If I ask my dealer to do this as part of the PDI, and they fill it with 93 octane gas (the station across the street from them has it), will that mean I don't have to do this myself later on if I always run 93 octane in it? Thanks.

My guess is the winds may have played a factor, going over the Driscol bridge on the PArkway (where 287 and GSP come together) the car was getting tossed around a bunch and it was windy all day. If you have 93 from the dealer and they pull the fuses beforehand I wouldn't imagine you'd have to do it but I think I would after even a little while after having run through a few tanks as it really can't hurt anything

Originally Posted by PQ

Maybe I'm wrong. I very well meay be. I'm not an engineer, but I don't see how an LS3 could require a battery pull along with the fuse pull also. I did the fuse pull because we reallized that there was a backup between the battery and the fuse box. (and of course because Scott threatened me if I didn't)

Mine is still running very well.

I averaged 26.3 mpg for approx. 250 miles on our way to Houston. Yes, I set the counter after I was allready cruising at speed, and looked at it before I got off the interstate and had to accelerate again, but it was still damn good. I had Bonnie, James, and Rebecca in the car as well.

Can someone verify the backup power location? My battery pull did nothing but froce me to reset all my settings. The fuse pull fixed the problem and I never had to reset anything.

PQ, I would agree with you here that the battery pull was probably just me being paranoid, if the power to the ECM is cut by the fuses, the power is cut and it resets itself. I was in the trunk wiring up my Sub and amp anyway so I just pulled it overnight hoping some "magic" happened but I wouldn't doubt that the day before with the fuse pull only I was back on the high octane table and it was the crazy winds in and around Jersey that I was contending with in my quest for maximum mpg. In any event, with the fuse pull/battery disconnect/one leg in the air with boxers inside out, she definitely has more pep at partial throttle, idles better, and is downright nasty at WOT so I am thrilled right now.

[JuicedSS]

I have done the fuse pull a couple of times on my LS3 in attempts to turn off the check engine light that is on because of my long tubes. Both times I have left the fuses out all night, and when I replace them in the morning, the check engine light is still on. I have found that disconnecting the battery is the only way to completetly reset the computer and to turn off the check engine light (atleast for a little while). So, the fuse pull may reset the fuel and timing tables, but it does not completely reset the computer on an LS3.

[PQ]

Originally Posted by JuicedSS

I have done the fuse pull a couple of times on my LS3 in attempts to turn off the check engine light that is on because of my long tubes. Both times I have left the fuses out all night, and when I replace them in the morning, the check engine light is still on. I have found that disconnecting the battery is the only way to completetly reset the computer and to turn off the check engine light (atleast for a little while). So, the fuse pull may reset the fuel and timing tables, but it does not completely reset the computer on an LS3.

Yup. Makes perfect sense. Like I said below. Mine fuse pull reset NOTHING inside the car that was visible, yet fixed the spark timing issue. My battery pull reset EVERYTHING inside the car but did NOTHING to help the performance.

I was just wondering why the Thread now states that on the LS3, the battery may need to be unplugged too?

This thread is for the 'Slows'. (acceleration problems) Previous to the time this thread was made, we didn't know what was wrong with them.
Hell, everyone was telling me there was nothing wrong. I KNEW there was.

Guess what? ONE apology. From my dealer.

[SRM]

I performed the fuse pull this weekend. Car *does* feel more responsive. Could be in my head though...

[wildcatjake]

If yall don't wanna wait overnight for your capacitors to drain so your memory is cleared, tap the positive battery cable on your battery to the negative terminal. This will zero the potential across them, and tada.

[jelly2m8]

Originally Posted by Fourth Camaro

Has something changed or is it still fuel that keeps the fuel pump from overheating?
I might be wrong, but I don't think it's ever a good idea to get low on fuel.

It's not so much keeping the pump cool, it's keeping the pump lubricated. yes there is a cooling factor of the fuel involved, but like the lubrication, cooling is controlled by the fuel passing through the fuel pump.

One of my summer cars lives almost exclusively on a low tank of fuel, after 22 years the originial fuel pump still works.