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#4557532 - 10/28/17 06:23 PM Gm V8 shaking in idle
yugrus Offline


Registered: 04/06/04
Posts: 437
Loc: ON, Canada
I have '14 Tahoe with 5.3L. Whenever I come to stop after driving, the engine doesn't idle smooth. Well, it does, for about 20 seconds. Silky smooth. After that, I can feel a faint shake through the floor. Before you say you don't feel it in your truck, put your left knee against the door trim while the engine is idling. Or look at the water in your plastic bottle in the cupholder.
The throttle body, MAF sensor and the engine's insides overall are clean. I wiped the intake pretty good through the TB opening while cleaning it. Smoked the engine multiple times through vacuum booster, no air leaks. I have AFM disabled through the stock tune (the only thing that is changed in the parameters). And there is a two-stage (sequential) catch can on the dirty driver's side.
I've been in several 5.3 trucks, and they all felt pretty much the same. Even the new gen DI engines have that faint shake.
So what is it? Why the engine is smooth for a while, and then shakes all of a sudden, and runs like that thereafter in idle?
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'14 Chevrolet Tahoe
'15 Mazda CX-5

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#4557569 - 10/28/17 06:47 PM Re: Gm V8 shaking in idle [Re: yugrus]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
How much mileage do you have on the upstream oxygen sensor(s) ?

I have the exact same problem and have been thinking of changing the upstream oh-two.

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#4557613 - 10/28/17 07:17 PM Re: Gm V8 shaking in idle [Re: yugrus]
04SE Offline


Registered: 05/04/07
Posts: 914
Loc: IL
My 2014 Silverado does the same thing BUT only on 87. If I have E85 in the tank she is silky smooth at idle.

Idling in park I don't notice it as much. Idling at a stop light with my foot on the brake is when I notice it most.
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Life's little problems can be solved with a shovel and silence.

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#4557621 - 10/28/17 07:21 PM Re: Gm V8 shaking in idle [Re: yugrus]
Nick1994 Offline


Registered: 02/19/13
Posts: 10097
Loc: Phoenix, AZ
Does the shakiness change if you stop at a light and then put it in neutral? Could be motor mounts. Not necessarily bad motor mounts, just they might not be designed to make it so smooth you can balance a penny on the engine.
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#4557636 - 10/28/17 07:30 PM Re: Gm V8 shaking in idle [Re: yugrus]
WyrTwister Offline


Registered: 01/13/13
Posts: 1506
Loc: Texas
Find someone with an advanced code reader ( that can display real time data ) and that knows how to use it .

How are the spark plugs and the rest of the ignition system ?

Best of luck to you , :-)
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God bless

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#4557642 - 10/28/17 07:37 PM Re: Gm V8 shaking in idle [Re: yugrus]
Tahoe4Life Offline


Registered: 04/26/08
Posts: 433
Loc: Miami Beach
My 2016 Tahoe does it also. Not everyday though. Mostly in nasty gridlock. Does not bother me that much.
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#4557716 - 10/28/17 08:27 PM Re: Gm V8 shaking in idle [Re: yugrus]
StevieC Offline


Registered: 08/21/08
Posts: 17116
Loc: Ontario, Canada
Could it be the IAC is a bit sticky and now allowing enough air in for a smooth idle?
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#4557784 - 10/28/17 09:18 PM Re: Gm V8 shaking in idle [Re: yugrus]
alchargo Offline


Registered: 03/02/16
Posts: 17
Loc: NW Iowa
My '13 Avalanche does the exact same thing. As did my old Silverado 5.3. Seems to be a common issue. I think it comes with the ownership of a GM 5.3.

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#4557888 - 10/28/17 10:51 PM Re: Gm V8 shaking in idle [Re: yugrus]
dishdude Online   content


Registered: 11/14/08
Posts: 8736
Loc: Phoenix
Could it be dropping the idle 50 or 100 RPM to save fuel?
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#4557897 - 10/28/17 10:57 PM Re: Gm V8 shaking in idle [Re: yugrus]
2strokeNorthstar Offline


Registered: 07/19/17
Posts: 272
Loc: PR CA, USA
It's an emissions thing. They have to run them really lean at idle for smog reasons or so I was told. Had a 6.0L vortec that did it since new. The Drive-Thru was really annoying in that thing. Hate on Modular Fords all you want they are some smooth running motors.

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#4557941 - 10/29/17 12:07 AM Re: Gm V8 shaking in idle [Re: 2strokeNorthstar]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: 2strokeNorthstar
It's an emissions thing. They have to run them really lean at idle for smog reasons or so I was told. Had a 6.0L vortec that did it since new. The Drive-Thru was really annoying in that thing. Hate on Modular Fords all you want they are some smooth running motors.


I always thought that an engine idling smoothy is an engine that's burning cleanly. No missfires.

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#4557959 - 10/29/17 12:46 AM Re: Gm V8 shaking in idle [Re: yugrus]
yugrus Offline


Registered: 04/06/04
Posts: 437
Loc: ON, Canada
Ok. Oxygen sensors are original, that makes it three years, pretty much brand new.
No E85 available here in Ontario where I am. Tried Shell 97, no ethanol, the truck didn't see the difference at all. Still shakes in idle.
Putting it in neutral doesn't make huge difference. Still shakes. Checked motor mounts for the torque twist, all solid.
I'very got Tech2,not sure what is more advanced reader there is... I didn't see anything out of order regarding fuel trim or air, idle or driving.
IAC- can't be sticky throttle plate, as I cleaned everything pretty good, including the shaft. It didn't make a difference anyway.
Gotta check actual injector timing when it starts happening. If they trim it significantly after idling for a while, will talk to Diablo to make some adjustments to the stock tune... I bet they know about the issue anyway...
I conclude that GM is doing it for emissions, as most owners would not notice that faint shake anyway. If I find a solution, I'll post it here.
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'14 Chevrolet Tahoe
'15 Mazda CX-5

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#4557974 - 10/29/17 01:06 AM Re: Gm V8 shaking in idle [Re: yugrus]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Shell 97 with no ethanol? I'm moving to Canada! thumbsup

This really seems to be a GM V8 thing. Got 3 NPR HDs with LS based engines, and the vibe is something they just do. Never thought about it, because they have a job to do, and I could care less about NVH, but it's something I might start investigating for the H of it.

On the other hand, I've had and come across a lot of silky big blocks.
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#4558279 - 10/29/17 10:45 AM Re: Gm V8 shaking in idle [Re: yugrus]
WyrTwister Offline


Registered: 01/13/13
Posts: 1506
Loc: Texas
For what it may or may not be worth , the company 2008 Chevy Silverado , I think has the 4.8l LS engine . 160,000 miles , still has the OEM spark plugs . Purrs along at idle , on E10 .

Best of luck , :-)
Wyr
God bless
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Wyr
God bless

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#4558718 - 10/29/17 07:56 PM Re: Gm V8 shaking in idle [Re: yugrus]
LeakySeals Offline


Registered: 02/18/11
Posts: 6561
Loc: Hudson, NH
I've been complaining about a strange idle in my GM 6.0 for the past 3 years I've owned it. Not always there, but some days I feel it sitting at a light. Best way to describe it is an electrical pulse. I've changed a ton of stuff. Its not vacuum. Not knock sensors. Not the TB. Not the plugs, coils. Not the catalyst. Transmission mount really helped a lot. Motor mount on drivers side should be replaced, feel it a little in the wheel. Can't see the engine shaking. But if you put your hand on the engine you feel it. A vibration that doesn't feel like a traditional ruff idle. Does not feel or act like a skip. Something electrical. Could be the lean at idle thing cause replacing the knock sensors reduced the frequency. And on cooler days doesn't happen. I've spent enough trying to fix the idle. Now its gonna be the insulation between me and the engine. Rubber mounts. I can't feel it as much with M1 5w30 as I can with other oils. Why who knows
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