Is it possible with a stock 1990 cougar xr7 to run 89 octane instead of 93 and not have to worry about detonation.
I've run 89 before for a brief time. If you pull the octane plug, that would help and it would run OK. Its not possible to NOT worry about it.Is it possible with a stock 1990 cougar xr7 to run 89 octane instead of 93 and not have to worry about detonation.
Yes if you take the blower belt off.
Is it possible with a stock 1990 cougar xr7 to run 89 octane instead of 93 and not have to worry about detonation.
You'd likely still see low RPM lugging knock. The timing would not adjusted with a removed blower belt.
But really...if you need to go to these lengths to save a couple of bucks a week, you have the wrong car, man.