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Old 01-14-2014, 09:30 AM   #30
Scooby Newbie
Member#: 378281
Join Date: Jan 2014
Location: Northeastern NY State
2014 Impreza 2.0i 5D
Quartz Blue Pearl


Originally Posted by Supa LA View Post
I have had a similar issue of late in my 05 sti. My car doesnt jerk, just seems to hesitate. This only happens while crusing at around 2200-2600 rpm in higher gears, like 4th-6th. Its mainly when im trying to hold speed without the cruise on. Can bad gas cause this? My oil is fine and i have had no issues with the tune before? HOWEVER, the last oil change was with T6. The previous owner ran Mobil1 5w30/40 depending on season (hot/cold) All of this started happening about one month ago (roughly). When i give it throttle it powers thru just fine. I have seen no issues on lower gears or speeds.

Mods are:

big maf intake
3" straight pipe
engine mounts
several other minimal ones.
Interesting. I have heard stories about the engine "getting used" to the type of engine oil and responding differently when a different type is used. However, these stories involved the use of high-mileage oil and then switching back to conventional. The stick I drove regularly was years ago and it was a much different ride than a STI. I did notice some hesitation when I was in a higher gear than I should have been. However, that car had far less HP and torque then a STI.
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