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Rough idle- Vibration

scale obsession

By scale obsession
in Troubleshooting & Recalls

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scale obsession Enthusiast

scale obsession

Posted
Posted

At one point, I found an extensive thread, discussing the rough idle, and motor mount replacement situation. I'm unable to find it now. I'm been to two different dealers,  PICO scope at both of them, and they claim its within acceptable range. Talked with GM care, they want a third opinion. If the third is within range, It sounds like I'm either going to have to make the decision to live with it, or trade the truck in, and move on, or purchase the motor mounts and install them myself. Are the motor mounts a definite fix for this issue? 

Awwmann Enthusiast

Awwmann

Posted
Posted

No i had the motor mounts done in 2017 mine still vibrates . The only thing that stopped it for a few months for me was to run sea foam through the top end  to clean the valves . 

vinemann12 Enthusiast

vinemann12

Posted
Posted

With my 2016-RCSB / 5.3, I have rough idle at times (only with engine is cold) and when at operating temp,, zero idle issues @ 14K on odometer

Discussed with Dealership service manager, by buddy and they did PICO test with no findings...

He has seen a few 5.3's with this issue, 2015 and newer but no real definitive cause..

 

As I only use Top Tier gas,, mostly BP, not worried about crap gas or water in fuel.

 

I have seen that some folks replace plugs and wires and have success in eliminating idle problem but this could be placebo affect..

 

Cheers---K

20165.3Eco Enthusiast

20165.3Eco

Posted
Posted

I had the mounts done. It changed the idle in that it's less noticeable while in gear and more noticeable in neutral.

 

It'll shake your phone if you have your elbow on the console out of gear. Otherwise its fairly livable in gear. 

scale obsession Enthusiast

scale obsession

Posted
  • Author
Posted
On 9/21/2018 at 11:50 AM, vinemann12 said:

With my 2016-RCSB / 5.3, I have rough idle at times (only with engine is cold) and when at operating temp,, zero idle issues @ 14K on odometer

Discussed with Dealership service manager, by buddy and they did PICO test with no findings...

He has seen a few 5.3's with this issue, 2015 and newer but no real definitive cause..

 

As I only use Top Tier gas,, mostly BP, not worried about crap gas or water in fuel.

 

I have seen that some folks replace plugs and wires and have success in eliminating idle problem but this could be placebo affect..

 

Cheers---K

Mine is more noticeable at operating temp, than anything. Top Tier gas here as well. Shell. I've seen similar posts as you , about plugs and wires and wondered if it really smoothed it out, or if it was placebo. 

diyer2 Senior Enthusiast

diyer2

Posted
Posted

My 2012 5.3l got a rough idle on a cold start.

A few treatments of  Sea Foam helped.

I cleaned the MAF sensor with denatured alcohol and Q- tips and that helped.

Runs good now.

 

:)

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