Fuse Pull: Low Octane Fuel Fix For L99 and LS3. Reset Fuel Map for High Octane Fuel. - Page 108 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

RavenSS · 07-20-2011, 08:51 AM

+1 Definitely Noticed a difference!

f5journal · 07-25-2011, 12:38 PM

OK, so let's put a new wrinkle in this. If I take the car to the dealer, can they look into the ECM and tell if it is on the high octane fuel table????

I am beginning to think mine is not and will not. (yes, I am looking for new places to get fuel) I use the highest I can get but I'm thinking 91 with ethanol is not going to react to the fuse pull

PQ · 07-25-2011, 12:42 PM

Quote:

Originally Posted by f5journal

OK, so let's put a new wrinkle in this. If I take the car to the dealer, can they look into the ECM and tell if it is on the high octane fuel table????

I am beginning to think mine is not and will not. (yes, I am looking for new places to get fuel) I use the highest I can get but I'm thinking 91 with ethanol is not going to react to the fuse pull

It's a good question. We haven't been qble to pin this down. Asked a number of 'Tuners' but nobody can tell us yes or no.

If you can get a datalog and ask a good tuner to tell you, then yes, they can tell you. But the dealer isn't going to waste their time. You can ask them and maybe they will, but I'm thinking no.

f5journal · 07-25-2011, 12:44 PM

Thanks PQ. I'm taking it in tomorrow for a minor problem and I'm going to see. I'll just ask and tell them it seems sluggish

PQ · 07-25-2011, 01:12 PM

Tell them to check this out.

GM TSB for fuse pull.

Quote:

#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.

Flying24 · 07-25-2011, 02:19 PM

I see the GM TSB is dated 2009, So this fuse reset works on 2011 L99? GM hasn't corrected this yet? With the L99 doesn't it run on more then one table with it having Active fuel management?

f5journal · 07-25-2011, 02:22 PM

Quote:

Originally Posted by Flying24

I see the GM TSB is dated 2009, So this fuse reset works on 2011 L99? GM hasn't corrected this yet? With the L99 doesn't it run on more then one table with it having Active fuel management?

That's part of the confusion. We have LS3 people claiming gains and we have tuners modifying fuel trim table in both the L99 and LS3 for both 2010 and 2011

PQ · 07-25-2011, 02:32 PM

Quote:

Originally Posted by Flying24

I see the GM TSB is dated 2009, So this fuse reset works on 2011 L99? GM hasn't corrected this yet? With the L99 doesn't it run on more then one table with it having Active fuel management?

There is no reason to lower the fuel table while AFM is engaged.

I have no way of knowing how the LS3 is effected. Or the L99 on a technical level. A good tuner does. But they of course will not weigh in.

Flying24 · 07-25-2011, 02:43 PM

Yes, but are the tuner tuning because of this and staying within factory parameters or tuning for added performance? Fuse reset does it lock in that fuel table or will it reset itself down the road?

joeysSS · 07-25-2011, 05:20 PM

I'm going to do it tonight. We ran a tank of 87 in it and I could tell it was dogging out and sounded like crap. I noticed a good change after I went back to 91 so hopefully this will fix it for good. Good info!

anthonyj9h · 07-28-2011, 11:19 AM

Quote:

Originally Posted by joeysSS

I'm going to do it tonight. We ran a tank of 87 in it and I could tell it was dogging out and sounded like crap. I noticed a good change after I went back to 91 so hopefully this will fix it for good. Good info!

wow hope you didnt have any detonation what that low of octane....def going to have preignition

Bernardinetti · 07-28-2011, 08:24 PM

Does anyone know if chiptuning the ECU will fix this problem? Maybe setting it up with a piggyback like Unichip, which will bypass the ECU's parameters to use its own optimal tables. I'll try it tonight and see what happens.

PQ · 07-28-2011, 08:33 PM

Quote:

Originally Posted by Bernardinetti

Does anyone know if chiptuning the ECU will fix this problem? Maybe setting it up with a piggyback like Unichip, which will bypass the ECU's parameters to use its own optimal tables. I'll try it tonight and see what happens.

Bernardinetti · 07-28-2011, 09:05 PM

Quote:

Originally Posted by PQ

And what is that supposed to mean? I know this question has probably been answered before, but there are over sixty pages on this thread to read...

Just took the fuses out... tomorrow we'll see what happens.

07-25-2011, 05:20 PM	#1508
joeysSS Drives: 2011 Camaro 2SS/RS Join Date: Jun 2011 Location: Edmond, OK Posts: 328	I'm going to do it tonight. We ran a tank of 87 in it and I could tell it was dogging out and sounded like crap. I noticed a good change after I went back to 91 so hopefully this will fix it for good. Good info! __________________

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07-20-2011, 08:51 AM	#1499
RavenSS Monarch is here Drives: 2011 Summit IOM 2SS RS M6 Join Date: Jun 2011 Location: Morris County NJ Posts: 107 View My Garage	+1 Definitely Noticed a difference!

07-25-2011, 12:38 PM	#1500
f5journal Senior Camaro Fanatic Drives: 2011 SS/RS manual - White Join Date: Aug 2010 Location: aiken, sc Posts: 1,980	OK, so let's put a new wrinkle in this. If I take the car to the dealer, can they look into the ECM and tell if it is on the high octane fuel table???? I am beginning to think mine is not and will not. (yes, I am looking for new places to get fuel) I use the highest I can get but I'm thinking 91 with ethanol is not going to react to the fuse pull

07-25-2011, 12:44 PM	#1502
f5journal Senior Camaro Fanatic Drives: 2011 SS/RS manual - White Join Date: Aug 2010 Location: aiken, sc Posts: 1,980	Thanks PQ. I'm taking it in tomorrow for a minor problem and I'm going to see. I'll just ask and tell them it seems sluggish

07-25-2011, 02:19 PM	#1504
Flying24 Drives: Orange Crush 2021 ZL1 1LE Join Date: Mar 2011 Location: Waldorf, Maryland Posts: 60	I see the GM TSB is dated 2009, So this fuse reset works on 2011 L99? GM hasn't corrected this yet? With the L99 doesn't it run on more then one table with it having Active fuel management?

07-25-2011, 02:43 PM	#1507
Flying24 Drives: Orange Crush 2021 ZL1 1LE Join Date: Mar 2011 Location: Waldorf, Maryland Posts: 60	Yes, but are the tuner tuning because of this and staying within factory parameters or tuning for added performance? Fuse reset does it lock in that fuel table or will it reset itself down the road?

07-28-2011, 08:24 PM	#1510
Bernardinetti Drives: 5th Gen 2011 Camaro 2SS 6.2 V8 IOM Join Date: Jun 2011 Location: NY Posts: 41	Does anyone know if chiptuning the ECU will fix this problem? Maybe setting it up with a piggyback like Unichip, which will bypass the ECU's parameters to use its own optimal tables. I'll try it tonight and see what happens.