issue 2014 rough engine idle

[Jsdirt]

Same ol', same ol' after 8 years ...

 

My '07 did the exact same thing. Off the showroom floor this thing was as smooth as glass, then around 2k miles or so, I noticed the miss/shake at idle while in a car wash, waiting for it to turn on. 8 years later at 77k miles, it's still doing the same. Dealer brushed it off as "nothing" back then. Guess there's no point in buying new, since they "ALL" do it!

 

All my carbureted vehicles idled smoother than this, once warmed up a bit.

[Justin MacGillivray]

My 2015 vibrates a little at idle after being warmed up. But It's also idling below 500rpm with foot on the brake and A/C going. I've moved the shifter up to neutral, revs pick up, all vibrations went away. It's just the motor resonating on the frame from what I can tell. It bothered me when I first bought it, it's got 5300 miles now and I rarely pay attention to it anymore.

[taylorcam11]

My 2015 LTZ CC 4x4 idles very rough. I am taking it in the weekend for the first oil change so i am going to get them to look at the rough idle. I am also having trouble with my heated/cooled seats. Cant feel them at all even on high. I will keep y'all updated on what they say about my rough idle!

[20L8TSierra24]

My buddy's 14 LT 5.3 has a terrible vibration at idle compared to mine. His truck has 32k on it. Mine has 18 now and I just put a CC on it, as well as treated it with some CRC engine valve cleaner. It seems like mine is idling smoother now.

[jlgarza15]

I bought my 2015 Silverado about three weeks ago and noticed vibration at idle on my drive home. After a few google searches and this this forum I found TSB PIP5211C. This bulletin just came out in July 2015 and replaced PIP5211B. They installed 3mm shims on the motor mounts and the tech noted it fixed the vibration. Won't know until I pick it up tomorrow, since they are also replacing the front passenger a pilar cover because there was a gap where it meets the dash. Love my truck and I'm hoping this fixes it. So far service has been excellent. I also had them align the front bumper since the gap looked pretty big. They sent to a body shop and it was adjusted and looks perfect now. My dealer has been good and offered to put me in a rental since the truck has been in since yesterday and won't be ready until tomorrow.

[Jsdirt]

You would think all these little issues would be taken care of BEFORE the truck:

 

• A: left the point of assembly
• B: left the dealership as customer took delivery.

 

That is just unacceptable. Two failures of QC that could easily be remedied. Great the dealer made things right ... but for $45- $60 LARGE, that all should've been fixed before you even LOOKED at it.

 

GM had better damn pick up the ball ...

[jlgarza15]

Picked it up, truck still vibrates. Feeling pretty pissed since the truck only has like 500 miles on it. My buddy bought one two weeks before me, no vibrations. Rode in my brother-in-law's last night, no vibrations. They rode in mine and joked how I get a free massage at a stop. I wasn't amused. Plan on taking it back tomorrow. As far as the a pillar gap they said they would have to remove and adjust the dash, I told them I didn't want to open that can of worms. I can live with gap, can't live with vibrations since I keep my vehicles for about ten years. We'll see, this if my first GM, I love the truck, but can't live with the vibrations.

[Jsdirt]

GM considers this "normal" - just like a brand new sub-500-mile vehicle that burns a quart of oil every 800 miles ...

[jlgarza15]

I took the truck back and the dealer is being very helpful. They are going to try new motor mounts to see if it takes care of the problem, if not they said they would get me full credit for my truck and let my pick out another truck. They ordered the new mounts and I have an appointment for Monday morning. I'll update when the new mounts are installed. Very happy the dealer is on my side.

[Jsdirt]

Well that's some great news!

 

So often we hear of it going the other way ... nice to hear a good story for a change.

[Jesse Davidson]

I took the truck back and the dealer is being very helpful. They are going to try new motor mounts to see if it takes care of the problem, if not they said they would get me full credit for my truck and let my pick out another truck. They ordered the new mounts and I have an appointment for Monday morning. I'll update when the new mounts are installed. Very happy the dealer is on my side.

thats very lucky, another thing they should check is the exhaust system. I know this is for the V6 model, but maybe the basics still apply?

 

http://oemdtc.com/6392/information-on-vibration-analysis-and-diagnostic-2014-2015-chevrolet-silverado-gmc-sierra/8

 

Condition 5:

Vibration Felt in 4 Cyl Mode (AFM) – V6 Engine OnlySeveral customers have commented on a vibration felt in the steering wheel or seat during 4 Cylinder Active Fuel Management (AFM) operation. This can be noticed more at 64-72 km/h (40-45 mph) and by lightly accelerating to the point where the enginetransitions to 6 cylinders, or V6 mode.

This type of vibration can be the result of exhaust cross pipe ground out and/or cab mount ground out.

To repair this condition, the three-way catalytic converter settling procedure in PIP5228: Vibration During Active Fuel Management V4 Mode Operation 1200–1400 Engine RPM should be completed.

I have rough idle in my V6 as well, here is a video I took to show it.

[jlgarza15]

Well, they replaced the motor mounts, truck was the same...They then let me drive another truck for a few days and if it didn't vibrate, they would let me trade it. Drove the newer truck, and no vibration problems in idle or on the highway. Truck has an MSRP of about $1k more, which I was willing to pay. Went in last night to do the deal and they wanted me to pay 2k more. Why? Because one of the rebates I got on the original deal was 1k for using Ally. I refied the loan from 3.19 to 1.74, so not they won't let me finance with Ally again to get the rebate because "they've seen the risk." I said no to the deal and asked for my truck back. They told me to keep driving the truck until Monday, when we can all meet. I told the dealer operator I would be happy to pay the MSRP difference, but did not want to lose the 1k in rebate value because I refied. There were was nothing in any of the paperwork about not being able to refinance. We'll see what happens Monday.

[Jesse Davidson]

Well, they replaced the motor mounts, truck was the same...They then let me drive another truck for a few days and if it didn't vibrate, they would let me trade it. Drove the newer truck, and no vibration problems in idle or on the highway. Truck has an MSRP of about $1k more, which I was willing to pay. Went in last night to do the deal and they wanted me to pay 2k more. Why? Because one of the rebates I got on the original deal was 1k for using Ally. I refied the loan from 3.19 to 1.74, so not they won't let me finance with Ally again to get the rebate because "they've seen the risk." I said no to the deal and asked for my truck back. They told me to keep driving the truck until Monday, when we can all meet. I told the dealer operator I would be happy to pay the MSRP difference, but did not want to lose the 1k in rebate value because I refied. There were was nothing in any of the paperwork about not being able to refinance. We'll see what happens Monday.

This is part of my post over in the vibration thread

After driving my truck for a while I will say that the rough idle fix that they performed (PIP5228; adjust exhaust and body cab mounts) has definitely helped, but the vibe is still there, just no where near as bad. Unfortunately, I think that it may have made the regular vibration slightly worse. I am theorizing that it is because the frequency of the rough idle vibe is no longer canceling out the frequency of the regular vibe, obviously I don't know this for sure. my other theory is whatever they did to the body cab mounts made it worse.

Here are the videos to compare the rough idle before and after fix (they are not the exact same, so you will have to adjust the frames so they are close to the same)

Pre fix:

Post fix:

[jlgarza15]

Well, the is going to pay off my truck. I am going to pay for the difference in MSRP and we are splitting the difference on the rebate. I'll be paying about $1500.00 more total. Truck doesn't vibrate, test drove it for a few days. Non vibrating truck, 20" wheel upgrade, and chrome exhaust tip. I get to finance with the credit union and they are moving aftermarket running boards and respraying the bed liner on the truck for me. Happy with the deal.

[Jesse Davidson]

Well, the is going to pay off my truck. I am going to pay for the difference in MSRP and we are splitting the difference on the rebate. I'll be paying about $1500.00 more total. Truck doesn't vibrate, test drove it for a few days. Non vibrating truck, 20" wheel upgrade, and chrome exhaust tip. I get to finance with the credit union and they are moving aftermarket running boards and respraying the bed liner on the truck for me. Happy with the deal.

I wouldn't be happy with that, you shouldn't be paying anything more than the difference in MSRP, on a trade assist, the rebates don't matter GM is basically making you a new truck and taking your old one.