Q: hi.. recently, in my g35 coupe, ive noticed rougher idling...not engine noise..but small vibrations in the steering wheel, and shifter. it just started happeneing... any ideas? i am using premium fuel ( 93octane), and always have...shell gas station only for the past 7months... i have roughly 60k on it right now..and i need it to last me another 3 years, until i pay it off. i do have extended warranty on it, but i do not want to take it to infiniti n pay a 100 deductible and have them tell me that nothing is wrong.. tht will be stupid... any other ideas?
A: you should be using premium fuel in the G35 but the rough idle maybe coming from the fuel even with premium because of the ethanol they are adding more of to at most gas stations now but another cause could be the throttle body and the injectors are getting a build up of carbon Well chances are with almost 60k on it the throttle body is all gummed up with carbon and will cause the problems in wich you are talkin about if you were to come in to dealership i wouls definitely recomend a Fuel induction service wich cleans the throttle body,runs a clean thru the intake and adds a complete fuel system to the tank very good service also make sure your using a factory air filter because the after market filters dont fit properly and flow air prperly and will ruin the mass air flow sensor and damage the throttle body also the ethanol they have been adding to gas has increased over the last few months wich also will contribute to the but not too bad