siggyfreud

Throwing a CEL = The car signaling you something is wrong via the Check Engine Light (C.E.L.).

Nuke

It's likely that, if you're not throwing a CEL (a.k.a. code), that the car already has a custom (or non-stock) tune. The fly in the ointment is that you could run into some difficulties if you attempt to retune it.

For mileage, just lighten up on the acceleration and watch your cruising speeds. I notice a rather significant drop in average MPG's as I drive faster than 65 MPH and higher than 1800 RPM. Hilly terrain, road surface, tire construction, tire pressure, wheel alignment, fuel with varying ethanol levels, wind speed and direction plus a ton of other things all can affect your fuel mileage.

Even on my usual long road trips with the Stang at steady 70MPH speeds, I typically average about 24 MPG (hand calculated; most of the onboard readouts are off by about 2 MPG). Drop that to cruising at 55 MPH and I've seen 27 MPG (but who the hell can drive for hours at 55???).

rebel_logan

well it does have the check engine light on so what tuner should i get to go along with my Steeda CAI that wont void my waranty and will get rid of the CEL?

THATGUY1089

where in oklahoma are you?

rebel_logan

by the muskogee in the northeastern part of ok... what about you?

THATGUY1089

lawton currently in iraq though i get back soon though.

f4ifrank

Congrats on the new ride!!!

If you're worried about fuel mileage now....Don't even look into the Forced Induction(F/I) threads. You'll really be screaming about fuel mileage then, but man is it a blast

THATGUY1089

it will be i little bit before i look in to that.

Nuke

Assuming the CEL is from running lean due to running the Steeda CAI w/o a custom tune, any custom tune should eliminate it. AM and Brenspeed are two of the best tune writers and both support the SCT. There are fewer and fewer that support the Diablo.

Tunes and CAI's and most any other aftermarket part will not void your warranty. Unfortunately, a lot of dealerships will intimidate the poor wusses that let them. And there sure are a lot of those wusses out there.

rebel_logan

lol well thanks guys im looking into the brenspeed and im hopeing to get it soon... after driving around this weekend the gas milleage doesnt even bother me as much because these cars are so much fun to drive and i get compliments everywhere i go... thanks