Mercury83

hey guys, i changed my car to the 93 race tune with less than a quarter of a tank left (which had 87 octane). is this the reason why it wasn't running or sounding right? i flashed it back to stock, but will this problem go away once the 87 octane gas is gone?

Mercury83

anyone? i'm really nervous right now and wondering if there is something wrong with the tune or whether the problem is just the remaining 87 octane gas.

28HopUp

Run that 87 outa your tank and fill it with 93. Then change the tune from 87 to 93. Detonation is NOT your friend.

Mercury83

excuse my ignorance, but what is detonation? and it is filled with 93 except for the little bit of 87 that was leftover. how longwould it take to run out the remaining 87 just driving around?

157dB

Pre detonation to be exact.
Its the gas detonating before TDC
or across from the spark plug and
the two fires collide. A 93 tune needs
93 Octaine fuel hence the name, "93
Octaine Tune".
Pre detonation is not pretty and hard
on the rod bearings.

howarmat

do you have a little better info

Mercury83

the check engine light comes on and it starts shaking/vibrating........

Mercury83

ok this has to be more than just a gas issue. i have no idea what is wrong.

howarmat

ok....yeah the CEL is alot different than just is sounds bad. Contact doug and he will get it worked out

Mercury83

well i've tried emailing him, and i tried calling before business hours ended, but to no avail. i really wish it were easier to get ahold of him as i need this problem to be fixed as quickly as possible. i'm really nervous about things like this.