I have a 2001 4.4i and for some reason, I decided to top off with 89 Octane (10 gallons), today. I normally run 93 Octane, but wanted to see if a "blend" of the 2 would be noticiable.
The engine runs fine, however within 10 minutes of doing so, the transmission is now shifting late. I never run it in Sport mode, but it feels to me like it is stuck in Sport Mode. Shifts are not occurring until about 4k rpms. Downshifts are also late to the game.
I tried Sport mode and there was no noticeable difference or improvement. I tried manual mode and it still appeared that the "software" was overridding my choices. I would shift into 4th, but it would not shift and then indicate 3rd.
I've only driven about 15 minutes like this and given the roads that I was on I was not able to push it beyond 4100 rpms in 3rd to see when/if it would shift into 4th.
I've had no problems otherwise with the trans. It does have 115k miles on it and I have not changed the trans fluid (nor did the prior owner, I suspect - given the state of all of the other fluids that I have changed).\
Honestly, even with the high miles, the trans was one of the factors that I used in buying the X as it was so smooth and appeared to have no issues.
Could 10 gallons of 89 octane really affect sensors to the point that the trans is acting this way?
Open to any thoughts or suggestions.
thanks!
03-20-2013, 01:28 PM
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