PistolPez73

I just removed my CAI and returned my stang to the stock tune for a state inspection I'm having done at my Ford dealer. I need to put gas in the tank. Will I be alright sticking with 92 octane on the stock tune or should I put some 87 in there? I don't plan on doing too much driving before the inspectionand will be reinstalling the CAI and 91 tune right after the inspection.

owero01

The 91 should be fine. Its only a problem if you use an octane lower than your tune.

loots06

+1

loots06

+1

PistolPez73

I figure I'd be O.K. But the car does seem to be backfiring a little, nothing major. Is this a result ot the 92 Octane gas?

owero01

No, it shouldn't cause you engine to backfire.

MartyMoose

When is it backfiring? During startup only or just when driving around? Remember, backfiring is a loud POP or BANG that sounds like a shotgun or something. If it's during startup and you get a nice roar then that's normal.

91 or 92 octane with a stock tune is just fine and is preferred in your situation since you'll be reinstalling the aftermarket tune.

PistolPez73

I noticed it when I was sitting in my garage and gave it some throttle. It is a very minor popping as the engine returns to idle rpm's.

wthalliii

Mine is totally stock and has always done that since the first time I drove it with 9 miles on it, and still does it after 18,000 miles.

Why are you having to remove the CAI for inspection? I know if you remove the cats, you have to put those back for inspection, but I didn't think a CAI would cause you to fail the emissions tests.

PistolPez73

I'm going to my Ford dealer for inspection and I'm not sure if they are a "Mod Friendly" dealer. Just trying to cover my $ss for any warrenty work in the future.