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

[SSGUNNER]

Can't remember when I posted that I had done the fuse pull but I am loving every second behind the wheel.

[Nameless]

Just for the heck of it I tried this on my 2012 LS3 this weekend. Took the fuses out and left them out overnight for about 13 hours.

Put them back in and.....

...couldn't really tell any difference. Perhaps my dealer did use premium from the start.... or.... it just is what it is. At least now I can stop wondering and get on with other things!

[Bumblebee2012]

My 2012 had 21 miles on it sitting inside the showroom with what is likely the fuel installed at the factory. While I was doing the paperwork they pulled it out to fuel it and I reminded them that it gets super unleaded, they let me take the salesman with me a mile away and fill it up with super using their direct bill account. I don't think I'm in need of a fuse pull.

Sent from my Galaxy Nexus using Tapatalk 2

[D Day Dog]

Okay, so... due to the lack of anything above 90 octane at our fill stations here in Alaska, I took my 2011 LS3 to Sunoco yesterday and did a mix of 1/2 tank of 90 with a 1/4 tank of 104, which should have netted me approx. 94.5 octane.

I did the fuse pull over night. This a.m. I let the car warm up as usual. The idle is noticeably smoother. At slow speeds, in rush hour traffic, it shifted smoother. I haven't taken it out on the hwy. yet or romped on because of traffic, but will do so in a safe area at lunch today and see if it's any more responsive on exceleration. I'll post those results tonight.

So far, so good...


UPDATE:

I ran the car at lunch and there was quite a noticeable power difference when dropping into a lower gear and passing someone on the hwy. I also broke the tires loose when I took off from a standstill without hardly trying, which had never happened before. I can definitely say there was a positive change in the car's performance. Unfortunately, I will have to keep mixing the gas, at a high price to me, in order to maintain this performance. The 104 octane sells up here for $11.25 per gallon. Spendy, but the benefits may outweigh the cash as far as I'm concerned. It's not like I'm putting anymore than 2000 miles a summer on the car anyhow.

Do the fuse pull. It was worth it to me...

[Micawber]

I'm going to try this next weekend. When I bought the car, a new last years 2011, I reminded the salesgirl that it is supposed to get only premium before going for lunch while they prepped the car for delivery. On returning she admitted to me that the detail girl had filled it up with 87! At least she checked and fessed up, and now those people should know better. Doh!

I read this thread before buying but wanted to make sure that gas was gone, and have been busy besides. Now it's 3 weeks later and I've put 3,000 km on the car so it's past due for a fuse pull. I love the car already but more throttle response is always welcome! /*fingers crossed*/

[PQ]

Hey guys.

I've said it a hundred times. If you want irrefutable proof and don't have a dyno then get this.

http://dynolicious.com/

And time your car. It's easy, fun, and will show you proof. Especially if you do about 25 runs before and it will only take a few after.

This issue came up when some of us noticed the sluggishness. My wifes Lexus IS350 was beating my car. A V6 Camaro beat Scotts SS at their dealer.

Time your car and you will get the proof you need.

Here was the original 'Fuse Pull' thread inspired by another dyno thread.

(My username was originally IRPQ11)

Originally Posted by PQ

Ok, Scott called me this morning and threatened me telling me to remove the #5 and #20 fuses to reset the computer. He claims I never take his advice so I decide to humor him and go through the motions in this meaningless and fruitless exercise that will be a waste of my time.









I did 5 quarter mile runs, the slowest being 13.86 and the fastest being 13.42

0-60 mph slowest was 5.66 and the fastest 5.19

Now I didn'te do the video but used my iPhone and at least one thing is accurate is that it has been consistant against it's self. Over the past 100+ runs I was getting a constant of between 6.1 and 6.2 in the 0-60 mph times and 14.5 and 14.8 in the quarter mile.

My tires were hard to keep from spinning and I have a new problem. That new problem is how to get a good launvh without spinning the tires.

The only oddity is that nothing seems to be reset on the instument panel. Oil life, windows, etc.

So, I want you 'slow' guys to remove the #5 and #20 fuses to reset whatever it is that it resets. I'm not telling you to do this but do it at your own risk. Not that it's dangerous as far as damage but because I don't know, I'm not an expert.

Soooooooo there you have it. I'm going back out later to do some more. I thought that maybe my phone was malfunctioning but the wheel spin was a dead giveaway.

I hope it stays this way. Let us know what you guys find if you do this.


OK, UPDATED WITH VIDS.
The first one is one of the better ones I did a while back.
The second two were today.




iPhone showed 5.24 0-60 mph, and 13.37 quarter mile. (second vid cut for timing)
(movie maker has 5.31)



iPhone showed 5.41 0-60 mph and 13.56 quarter mile. (second vid cut for timing)
(movie maker has 5.34)

[E.T.]

Just out of curiosity, has GM ever come out with an official fix or announcement about this? Imagine not being a member of C5 and never hearing about this, and having an SS that gets beat by V6's. It's still unbelievable to me that we buy forty thousand dollar performance cars, and have to deal with this silly issue. I feel like the purpose of every mod I've done so far has been to fix GM's mistakes. I had to tune it to lose AFM, get the tranny optimized, and last but not least, eliminate the fuse pull problem. The stock gear ratio is made more for economy than performance, so I had to take care of that.

Don't get me wrong...I love the car, but whoever is in charge of this stuff at GM really has their head up their Do the Mustang guys have to deal with crap like this?

[PQ]

Originally Posted by E.T.

Just out of curiosity, has GM ever come out with an official fix or announcement about this? Imagine not being a member of C5 and never hearing about this, and having an SS that gets beat by V6's. It's still unbelievable to me that we buy forty thousand dollar performance cars, and have to deal with this silly issue. I feel like the purpose of every mod I've done so far has been to fix GM's mistakes. I had to tune it to lose AFM, get the tranny optimized, and last but not least, eliminate the fuse pull problem. The stock gear ratio is made more for economy than performance, so I had to take care of that.

Don't get me wrong...I love the car, but whoever is in charge of this stuff at GM really has their head up their Do the Mustang guys have to deal with crap like this?

GM TSB for fuse pull.

#PIP4728: Higher Than Expected 0-60 MPH (97 KPH) Acceleration Time - (Nov 4, 2009)


Subject: Higher Than Expected 0-60 MPH (97 KPH) Acceleration Time


Models: 2010 Chevrolet Camaro

with V8 Active Fuel Management Engine (RPO L99)

and 6 Speed Automatic Transmission (RPO MYC)




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may complain of higher than expected 0-60 MPH (97 KPH) acceleration times when hot ambient temperatures are present. In some cases, they may report 0-60 times around 7 seconds.

This may be the result of the vehicle being filled with regular grade unleaded gasoline at one time. If the vehicle has been filled with regular unleaded gasoline, the ECM may be compensating for the lower octane by retarding the ignition timing during certain driving conditions.

Recommendation/Instructions:
If SI diagnosis does not isolate the cause of this concern, perform the suggestions below if the customer wants the best performance from their Camaro:

In an area where it is legal to do so, take a snapshot of a 0-60 WOT acceleration event and compare the vehicle speed parameter to the snapshot timer to determine the 0-60 MPH time.
Determine what gasoline octane the customer has been filling the vehicle with.
• 2a. If they have never used anything but premium unleaded with a posted octane of 93 or higher, go to step 3.

• 2b. If they occasionally use regular or mid-grade gasoline, the gasoline must be removed from the tank and it must be refilled with premium fuel of 93 octane or greater. This can be done by advising the customer to switch to premium fuel of 93 octane or greater and returning after a few tanks of premium fuel have been consumed. Or, if immediate results are necessary, drain the fuel tank, refill it with premium fuel of 93 octane or greater, and drive the vehicle at least 15 miles to purge the old fuel out of the fuel rail and lines.

Reprogram the ECM with the latest TIS2Web calibrations to reset the ECM adapts. Normally this reset can also be accomplished by pulling the 2 main ECM fuses (F13R and F20U) shown in the ECM Power, Ground, MIL, and Serial Data Schematic (SI Document # 2209065).
In an area where it is legal to do so, take another snapshot of a 0-60 WOT acceleration event and compare it to the original snapshot to determine if the 0-60 MPH time has increased. If an increase is noted, advise the customer that they should only use premium unleaded gasoline with a posted octane rating of 93 or higher to continue getting the best performance from their Camaro. This is outlined on page 8-45 of the owner's manual. GM Connect Message G_0000037144 was also sent out on 9/2/2009 about filling stock units with premium gasoline.

[Mongoose03]

Originally Posted by PQ

GM TSB for fuse pull.

13 and 20

[PQ]

Originally Posted by Mongoose03

13 and 20

Not sure what that means. But my dealer confirmed 5 and 20.

Is it possible the 20 is coincidence and the 13/20 mean something else on the Serial Data Schematic (SI Document # 2209065)?

[KBruno]

Originally Posted by PQ

Hey guys.

I've said it a hundred times. If you want irrefutable proof and don't have a dyno then get this.

http://dynolicious.com/

And time your car. It's easy, fun, and will show you proof. Especially...

Just counting 1...2...3... gave me proof enough. My dealer doesn't even have premium gas so I gave this a shot and just counting it seemed to give me around 1/2 sec. 0-60. There's enough thumbs ups here that I didn't need to add mine but I hadn't seen http://dynolicious.com/ before checking this thread for updates today. That is just the coolest app! Thanks PQ!

[BSR-1]

Originally Posted by Camaro/ss/rs

Done and absolutely notice the difference, soooo much more responsive. Thanks guys, great result! Seems to have made the car REALLY come alive!

Thanks for the update!
So many say they'll get back with the results and then you never hear from them again. In those cases I have to assume that it was not successful.

[PQ]

Originally Posted by BSR-1

So many say they'll get back with the results and then you never hear from them again. In those cases I have to assume that it was not successful.

BUT, if you'll read the original fuse pull I said that it wasn't so intense that I could be 100% sure. Until I timed it.

[BSR-1]

Originally Posted by PQ

BUT, if you'll read the original fuse pull I said that it wasn't so intense that I could be 100% sure. Until I timed it.

I'm not doubting you at all.
I just wish all the guys who say, "OK I'm pulling the fuses and I'll let you know how it goes" would follow through with their results.