2015 Lacrosse Engine Shutter idle

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KShaw

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2015 Lacrosse
Hello everyone, I recently bought a 2015 Lacrosse 3.6 with 48k miles. I'm experiencing an engine shutter/vibration only while at idle. The car can be both in park or drive when I start to feel it. Sometime when I start the car I won't have a shutter then once I get back in 30mins later it's there.
I brought the car to the dealership and they said they "couldn't recreate the problem."
Also using more electronics I.e. AC, Lights, seat heaters...etc doesn't make the car shutter more or doesn't create the shutter.
I thought maybe it's bad gas? Or spark plugs?

If you have experienced this I would love any feed back! Thanks
 

Rich B.

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Minot, ME
Buick Ownership
2016 LaCrosse & 2013 Boss 302 Mustang
Just happened to be viewing this early, so...... Sounds like as you stated, a cylinder borderline misfiring. May be coil and good chance a code is present to assist. Long ago would have engine running and would remove plug wire one at a time to see if idle got worse or no change. Even a plug boot not fully seated.

Wouldn't put fuel out of the equation either. Don't believe anything as TPS or MAF is at fault because it's a skipping and not anything constant or variable🤔

Forgot, I used to use high voltage fuse pullers removing and reseating plug wires with engine running.
 
Last edited:
1,404
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2007 Lucerne CXL. and 1995 Lesabre currently, past 1973 Riviera, 1968 Riviera
Not picking on the service shop as you would know them better, but it's not uncommon for them to scan it and then test drive it for 5 minutes saying they can't reproduce the problem LOL. Intermittent problems are difficult to find but simple trouble shooting can eliminate what isn't causing the problem.

A top tier injector cleaner may be a option, certainly can't hurt. Check that the intake hose, clamps and filter are properly fitted, vacuum hoses are installed properly, make sure ignition system is in good repair plugs and wires.

Other items can possibly cause this, mechanical or electronical, but it's tossing a bunch of wild guesses hoping ones stick.
 

Fcar1953

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Pittsburgh Pa
Buick Ownership
14 Lacrosse Premium AWD 15 Enclave Premium
My 14 is not as smooth when i burn Regular fuel. I run high test more often than regular but i do change off. i can always tell when I'm running regular, not as smooth. I burn Costco fuels they only have regular or high test. I guess ill get my butt flamed because i brought up hight test fuel!!!! It is the 6 cylinder.
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tombalas

Buick Newbie
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2016 Buick Lacrosse Leather
My 14 is not as smooth when i burn Regular fuel. I run high test more often than regular but i do change off. i can always tell when I'm running regular, not as smooth. I burn Costco fuels they only have regular or high test. I guess ill get my butt flamed because i brought up hight test fuel!!!! It is the 6 cylinder.
Using premium cannot hurt, but I routinely buy generic unbranded 87 octane regular for my 16 with a 3.6, and no issues at all thus far at 35,000 miles, so I'm sticking with the cheap stuff.
 

Fcar1953

Junior Member
67
11
8
Pittsburgh Pa
Buick Ownership
14 Lacrosse Premium AWD 15 Enclave Premium
Using premium cannot hurt, but I routinely buy generic unbranded 87 octane regular for my 16 with a 3.6, and no issues at all thus far at 35,000 miles, so I'm sticking with the cheap stuff.
You do what ever you like, I’m not telling you to change what you’re doing
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Rich B.

Active member
280
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Minot, ME
Buick Ownership
2016 LaCrosse & 2013 Boss 302 Mustang
Yes, mileage is better with higher octane fuel due to the engine can advance timing further without signs of predetonation or pinging/knocking.

We use the 87 octane with ethanol no less and mileage is horrible, but it's Maine. image.jpeg
 

richardnewton

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Buick
We use the 87 octane with ethanol no less and mileage is horrible.
That ethanol is terrible. We have no business putting corn in gasoline.

Just a massive transfer tax from working families to the big corn farms & genetic engineers. And horrendous for the environment.

Unfortunately, neither party has any willingness to touch that tax with a barge pole.
 
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