So I purchased my 2021 F150 5.0 single cab. I don’t like the auto restart on the truck so I leave it off when I’m at a stop light. I noticed a vibration on idle. The truck shakes more than I would think a new truck should shake. It shakes while it warms up. I take it to the dealership and they keep saying it’s normal for these new trucks to shake on idle. I wanted your guys input with your trucks. Maybe it is normal and I gotta deal with it, or the dealership is full of **** and doesn’t wanna repair it.

 

I have a 2021 3.5 ecoboost and the same thing happens to my truck only warming up aswell no codes just werid

 

I can't remember if my 2016 5.0L did but my 2019 Ecoboost does a bit but not bad. Over the years seems more vehicles had an intermittent shake at low rpms on idle around 500 or 600 rpms. The shake is completely gone at an idle rpm of 750 rpms or so, as that's warming up. Not uncommon to have a shake here and there after it warms up.

You may have bad gas or low octane 87. With these new vehicles recommending 91+, I wouldn't use anything less. Yes it can be used, but they recommend 91+ octane for a reason, most likely that these engines "RUN" better on 91+ octane.

What are you comparing it to that has no shake on idle?? Usually the smaller displacement the engine, the more vibration and shake.

 

Recommended octane for the F150 is 87. Minimum is 87, recommended is 91. I stand corrected.

 

I put 93 or higher octane

 

I put 93 or higher octane

 

Didn't know they had higher than 93 octane other than racing fuel sold at a few gas stations here.

 

I keep Costco 87 in the tank of my 3.5 near exclusively.

No death rattle here...just the low rpm grumble

 

I'm in PA there is a sunoco around me that Has 100 octane it's like 10.00 a gallon

 

Yeh, that's the race fuel they sell here in NW Indiana.