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Rough Idle

gmcleer

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gmcleer Enthusiast

gmcleer

Posted
Posted

My 2014 CC 5.3 seems to idle a little rough lately. It has 19,000 miles and has done some towing. Anyone with similar experience? I'm going to use 93 on the next fill up. I am also thinking about an intake valve cleaner with the DI. Any ideas?

 

Thanks!

gmcleer Enthusiast

gmcleer

Posted
  • Author
Posted

No catch can. I remember hearing ?sea foam? could be used to clean the intake valves? I'm hoping its just crappy gas, but it may be time to look into a catch can and or a cleaning. I was wondering if anyone else was getting a rough idle.

BronzeSierra Enthusiast

BronzeSierra

Posted
Posted

Same slight rough idle here on my 2015 @ 21,000mi. Thought it might be the winter gas. I ran a full tank with 2 cans of Seafoam, no change.

gmcleer Enthusiast

gmcleer

Posted
  • Author
Posted

I just put in 3/4 of a tank of Shell 93. Is there anything we can spray in the throttle body to clean off the valves? Gas additives won't clean the valves with the direct injection.

muddkatt Senior Enthusiast

muddkatt

Posted
Posted

Take it to the dealer, that is why we have a warranty. IF there is a problem with the valves due to DI, the more complaints and money it cost GM, the more likely they are to address the issue.

Sidewayz Enthusiast

Sidewayz

Posted
Posted

Mine has the same at 2100 miles. Started at about 150 miles. Figured winter has also.

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted

I just put in 3/4 of a tank of Shell 93. Is there anything we can spray in the throttle body to clean off the valves? Gas additives won't clean the valves with the direct injection.

 

Running seafoam in the fuel won't do much of anything for a Direct Injection engine. There are a few products designed to clean DI engines.

 

http://crcindustries.com/auto/intake-valve-cleaner.php

 

https://www.bgprod.com/catalog/gasoline-fuel-system/bg-gasoline-direct-injection-cleaner/

 

I've used the CRC cleaner with good results. It's very important to follow the instructions on the can. Some guys on here complained they didn't notice any improvement but they didn't follow through with the instructions.

 

You should also consider a catch can.

 

87 octane fuel always made my engine run like shit, especially once the engine had been running for awhile and I would be sitting at a stoplight. I run 89 at a minimum.

  • 1 month later...
darkfox1 Senior Enthusiast

darkfox1

Posted
Posted

ressurecting a bit of an old thread..

 

just got a 2016 LT, rough idle (very noticeable on a bottle of water in the cup holder) in drive only (reverse is fine?) has 70 miles on it.

Vic15 Enthusiast

Vic15

Posted
Posted

Make sure a spark plug wire didn't come loose, which has become an issue...

redhot1.4 Enthusiast

redhot1.4

Posted
Posted

Our 14 started this a month or 2 ago. It starts then stops very short lived , been running 93 for the last 3500 miles now at 13.500miles

Haven't heard the wife complaining about it in a while

Shu Enthusiast

Shu

Posted
Posted

 

Running seafoam in the fuel won't do much of anything for a Direct Injection engine. There are a few products designed to clean DI engines.

 

http://crcindustries.com/auto/intake-valve-cleaner.php

 

https://www.bgprod.com/catalog/gasoline-fuel-system/bg-gasoline-direct-injection-cleaner/

 

I've used the CRC cleaner with good results. It's very important to follow the instructions on the can. Some guys on here complained they didn't notice any improvement but they didn't follow through with the instructions.

 

You should also consider a catch can.

 

87 octane fuel always made my engine run like shit, especially once the engine had been running for awhile and I would be sitting at a stoplight. I run 89 at a minimum.

 

Remove and clean the throttle body, then I used Seafoam as per the instructions and it cleaned mine up great. Used it on my DI Camaro and the wife's DI 5.0 Mustang and it worked great there too.

These engines spark knock retard timing a lot on 87 and 91 octane. I generally stay with 93 octane or E85 from time to time.

A catch can is good advise for DI engines. I have them installed on the Mustang and will be installing on the truck soon.

 

ressurecting a bit of an old thread..

 

just got a 2016 LT, rough idle (very noticeable on a bottle of water in the cup holder) in drive only (reverse is fine?) has 70 miles on it.

Are you sure this is only at idle or even while driving. See the vibration threads.

 

Our 14 started this a month or 2 ago. It starts then stops very short lived , been running 93 for the last 3500 miles now at 13.500miles

Haven't heard the wife complaining about it in a while

20L8TSierra24 Senior Enthusiast

20L8TSierra24

Posted
Posted

I have a catch can, run Lucas cleaner in every other tank, and run nothing but top tier 93 octane in mine. After 30k, my engine is still very smooth

darkfox1 Senior Enthusiast

darkfox1

Posted
Posted

 

Are you sure this is only at idle or even while driving. See the vibration threads.

 

Well.. to be honest.. it is kind of bouncy compared to the 4 other K2 trucks I've driven..

 

I figured it just had the "bounce" problem and I was going to just put up with it. I'm so tired of dealing with problems after my repurchase I just want to give up.

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