2001 Silverado 5.3, switching from 91 octane tune to 87

JL8Jeff · Post by **JL8Jeff** » Mon Mar 14, 2011 3:45 pm

With gas going up again I want to switch from the 91 octane tune down to the 87 octane tune. Do I have to restore the factory tune before installing the 87 octane tune or can I just install the 87 in place of the 91 tune?

2001 Silverado 5.3 using the U7198 Predator.
Jeff

Post by **mikel** » Mon Mar 14, 2011 3:46 pm

No, just load the 87 tune.

2001 Silverado 5.3, switching from 91 octane tune to 87

2001 Silverado 5.3, switching from 91 octane tune to 87

RE: 2001 Silverado 5.3, switching from 91 octane tune to 87