30i Engine Vibration at Idle

[bmrboi2]

Well that seemed to do it plus running some Shell gas certainly helped as well...Granted I only got 200 miles out of that tank of gas but everything seemed to improve dramatically. Gas mileage has resumed to its usual 25-28 HWY and the engine is as smooth as silk.

[rh71]

Originally Posted by bmrboi2

Well that seemed to do it plus running some Shell gas certainly helped as well...Granted I only got 200 miles out of that tank of gas but everything seemed to improve dramatically. Gas mileage has resumed to its usual 25-28 HWY and the engine is as smooth as silk.

I've used Techron a few times including right before my last oil change (used that tank of gas then did the change) in January and I still have the idle vibration. No big difference in engine performance either.

Also wanted to clarify, it happens even when the engine is warm.

[bmrboi2]

My husband actually commented on how the rough idle disappeared after a $15 can of fuel injector cleaner and a $35 fill up of shell 94 octane. Rough idle gone today.