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Rough Idle 2013 Savana


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rryan
New User

Jan 10, 2017, 8:35 AM

Post #1 of 7 (348 views)
Rough Idle 2013 Savana Sign In

2013
GMC Savana 2500
4.8L V8
90k miles


I first noticed this because I can feel an unusual idle in the driver's seat at red lights. There is a random bumpiness present in the the idle.

Listening from the outside, there are clicking noises from the engine and a pronounced change in engine sound, heard most clearly near the exhaust pipe. It sounds as thought the engine is revving way down--at the lowest point the exhaust pipe shakes a bit. Seems to be worse after several hours on the road.

A couple of times there was slight lurch as I stopped, but there have been many, many more times it did not lurch.

No check engine light on. A local mechanic could not find anything other than a dirty throttle body, which they cleaned, but it didn't help at all. They checked the battery also, said it was fine.

Shortly after this started I noticed another issue: I can often feel a grinding sensation in the accelerator. Particularly on the freeway when there are subtle changes in the pavement, causing the van to bounce just a hair. I doubt the problems are related, but I really don't know.

Any advice is greatly appreciated.

My description may be vague, so I took a video that I think captures the issue okay: https://youtu.be/lc5lrvC4RJM


kev2
Veteran
kev2 profile image

Jan 10, 2017, 10:59 AM

Post #2 of 7 (300 views)
Re: Rough Idle 2013 Savana Sign In

The CEL is off, but you still need to scan for codes - did you?
No modifications no added devices, GPS, audio, something plugged into DLC?
Poor running and no codes might want to check fuel pressure...


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 10, 2017, 11:00 AM

Post #3 of 7 (300 views)
Re: Rough Idle 2013 Savana Sign In

Did your mechanic inspect the exhaust system? Bang on the pipes and see if anything is loose or vibrating. Maybe do a good visual of the exhaust heat shields.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 10, 2017, 11:48 AM

Post #4 of 7 (289 views)
Re: Rough Idle 2013 Savana Sign In


Quote
Listening from the outside, there are clicking noises from the engine and a pronounced change in engine sound



Could that noise be described as a snapping noise, possibly a spark arcing?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



rryan
New User

Jan 10, 2017, 2:59 PM

Post #5 of 7 (272 views)
Re: Rough Idle 2013 Savana Sign In

@kev2: No mods at all. Honestly, I'm not sure if the the mechanic scanned for codes.

@Discretesignals: They probably did not inspect in detail. I will try that with the pipes.

@Hamertime: The clicking sounds more like a solenoid closing than a spark. You can hear it in the video.

Thanks for the relpys, guys. I was hoping this might be a common issue, but it looks like it could be any number of things. I don't really want to go back to the same mechanic after they have already displayed a lack of interest in getting to the root of the issue. I am in Arlington, TX and gladly will take suggestions on a good shop.


kev2
Veteran
kev2 profile image

Jan 10, 2017, 3:19 PM

Post #6 of 7 (259 views)
Re: Rough Idle 2013 Savana Sign In

many of the auto parts stores do FREE scans - easy, fast, FREE, a suggestion to get started ..


rryan
New User

Jan 10, 2017, 3:29 PM

Post #7 of 7 (256 views)
Re: Rough Idle 2013 Savana Sign In

Good call. I will take it to Auto Zone in the morning and see what they can pull up.






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