I should start out saying I Live in Hilly SW Wisconsin, its rolling hills that are 100-400ft in height. The first couple tanks of gas I used premium & noticed no issues with my car, now with 87octane I notice what can best be described as surging while going up hill. at first I thought I was imagining it, but with my girlfriend driving she looked over at me like WTF is the car doing, so I knew it wasn't just me.
Even on a small slight grade I thought I felt this surging, but on bigger hills when the car downshifts(its an auto) the problem is more pronounced. I read on a few post here the car is pulling timing because it senses knock with the low octane fuel but the way it feels its more like it dials things back for 1sec, then trys to go full power again & keeps cycling between the two until the top of the hill(a nice queasy see-saw feeling).
I have a ScanguageII but have not hooked it up yet to see if it is the computer retarding the timing, I was wondering if anyone else has experienced this? does anyone know what these motors usually run at(stock tune) for timing?
More info:
It has not been that warm here(around 50degrees during the day)
I only use Top Tier Gas(just not premium the last couple fill ups).
Even on a small slight grade I thought I felt this surging, but on bigger hills when the car downshifts(its an auto) the problem is more pronounced. I read on a few post here the car is pulling timing because it senses knock with the low octane fuel but the way it feels its more like it dials things back for 1sec, then trys to go full power again & keeps cycling between the two until the top of the hill(a nice queasy see-saw feeling).
I have a ScanguageII but have not hooked it up yet to see if it is the computer retarding the timing, I was wondering if anyone else has experienced this? does anyone know what these motors usually run at(stock tune) for timing?
More info:
It has not been that warm here(around 50degrees during the day)
I only use Top Tier Gas(just not premium the last couple fill ups).