I have always run 87 octane in my '98 GT with no problems at all. The other day I drove up to Wal-Mart for a new battery, switched them out in the parking lot and drove home. Apparently, just unhooking it for 1 minute reset the PCM because when driving home, I stomped it hard in first and second, and the car was pinging BAD. The next day after driving to work and back, I romped on it again in first and second with no pinging at all.
So I am assuming the pinging was from the PCM trying to dial in the timing? If so, wouldn't the car have more power if I switched to 93 and reset the PCM? This way it wouldn't have to pull the timing as much. I've always thought you wouldn't gain any power by running a higher than recommended octane, but this makes me wonder?
If this is stupid, just tell me, and I'll put the crackpipe down.
So I am assuming the pinging was from the PCM trying to dial in the timing? If so, wouldn't the car have more power if I switched to 93 and reset the PCM? This way it wouldn't have to pull the timing as much. I've always thought you wouldn't gain any power by running a higher than recommended octane, but this makes me wonder?
If this is stupid, just tell me, and I'll put the crackpipe down.