I have a 1995 Mustang GT w/ auto trans...NO mods whatsoever. 139k miles. I have owned two other Stangs both moderately modified. I used this forum a lot when I had the other stangs..
I have read a lot of people on here say that the motors are tempermental and some have theorized a poor factory tune is to blame for the widespread preignition/pinging problem. Well I have had this paricular mustang since January and havent done any work to it. I have always thought the car was kind of slow, slower than it should be.. and have suffered constant pinging sometimes very terrible sounding and always ran 91 octane.
Since the day I got it I have ran 91 octane fuel in it as opposed to 87/89 octane due to what I have seen in here it sounds like you kind of have to run the 91 in the 94-95 5.0 motor. Well yesterday I had to drive to LA which is about ap 60 mile drive..the last day before that I had for the first time put 89 octane in it because my buddy pumped and accidentally selected 89 octane..and she seemed to run better... Less pinging, "lighter on her feet". Well to make it cheaper for the drive to LA I ran all 89 octane again, and an Obvious difference.. again.. considerable less pinging.. more power.. lighter feeling. By the time I got back to town it was cool out.. mid fifties degree wise. And the car ran stronger and virtually ping free still.
Well today is day 3 and used the 89 again.. and the car is running stronger and basicly ping free.
*My question is:
Could the 91 Octane that I thought was helping actually not good for my car?
I have read a lot of people on here say that the motors are tempermental and some have theorized a poor factory tune is to blame for the widespread preignition/pinging problem. Well I have had this paricular mustang since January and havent done any work to it. I have always thought the car was kind of slow, slower than it should be.. and have suffered constant pinging sometimes very terrible sounding and always ran 91 octane.
Since the day I got it I have ran 91 octane fuel in it as opposed to 87/89 octane due to what I have seen in here it sounds like you kind of have to run the 91 in the 94-95 5.0 motor. Well yesterday I had to drive to LA which is about ap 60 mile drive..the last day before that I had for the first time put 89 octane in it because my buddy pumped and accidentally selected 89 octane..and she seemed to run better... Less pinging, "lighter on her feet". Well to make it cheaper for the drive to LA I ran all 89 octane again, and an Obvious difference.. again.. considerable less pinging.. more power.. lighter feeling. By the time I got back to town it was cool out.. mid fifties degree wise. And the car ran stronger and virtually ping free still.
Well today is day 3 and used the 89 again.. and the car is running stronger and basicly ping free.
*My question is:
Could the 91 Octane that I thought was helping actually not good for my car?