Low power, poor MPG
I have a 94 coupe, LT-1, auto. I do not have any codes at this times, no check engine lights. I have a Wide-Open Magnaflow exhaust and K&N filter. Other than that the car is stock running gear. I have 78K on the car now. It never refuses to start and runs okay, just not like what I expect from a corvette. I have owned the car for 3 years and up until this last fall it was my daily driver. If i rev the car in idle, it is slow to respond and then revs better in the mid-range. On the street it seems to be the same meaning that if I want to accelerate it doesn't rev like I think it should. I have read that having a louder than stock exhaust (mufflers or headers) can cause the knock sensor to retard timing by as much as 21 degrees. Has anyone else experienced this? The article that I read suggested replacing the LT-1 knock sensor with a LT-4 sensor. Any reply would be appreciated.