[PQ]

Originally Posted by KKreme15

So F13 in the trunk?

Correct.

Here is the PIP from GM.

#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)




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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.