My 2014 LTZ2 has what I consider a rough idle. It's not overly rough, but what I am experiencing is that when stopped, I feel a vibration in the steering wheel. I don't recall that in any of my other cars I've had.

Is anyone else experiencing this? Is it normal?

I had it at service dept and listed rough idle, but when I picked it up, they said they could not replicate the problem. I didn't have time to stay and discuss.

 

How many miles? LuckyDriver also has had complaints, but he's near 20k or more.

Let me find the link to that.

 

do you have a stumble at idle after hiway driving? - Chevy Impala Forums


vibration in steering wheel when stopped - Chevy Impala Forums

I had a P0010 at 860 miles. I couldn't tell as of yet, but it was slightly rough. My MPG had fallen off drastically 18 mpg, but I didn't know that was a problem since it was so early on and I hadn't driven it much.

2014 2ltz mil - Chevy Impala Forums

But after they replaced the actuator, it was smooth. That I noticed.

There is a slight vibration I can feel at times, but it is barely noticeable. This motor is DOHC SIDI. Is this your first one?

Compared to my rough idle cammed f-body, anything else is smooth.

 

I have 5600 miles on it.

I don't have a stumble that I've noticed. I have noticed it rough idling more on occasion, but not tied to highway driving. When it is rougher, it is just for a short time.

I wondered if this particular engine would be expected to be a bit rough due to whatever is in it for the HP. HOwer, I don't think a 302 HP engine should idle rough. I had a 302 HP Mercedes 2012 Coupe, and it idled fine. My LS1 2004 Corvette motor in my '56 does not pass a vibration to the steering wheel.

I'll check out the links you posted. Thanks...

 

I haven't seen the underside of a Gen9 so don't put a lot of faith in what I'm about to say.


The rack and pinion is mounted on the floor pan and the engine is on the cradle. Does anybody have a clue about how a slight idle roughness is being coupled to the steering column? Could the rubber cradle insulators have changed?


I'd be tempted to disconnect the upper engine mounts (the dog bones) then push and pull the engine fore and aft while it's idling to see if I could change the character of the vibration by stressing the lower mounts. Maybe a mount is somehow grounded.


Still, none of this explains the tight coupling to the steering column. If it were just a rough idle you'd see the engine shaking.