Rattle When Cruising And Give It A Little Gas

[Bogart]

I have a 2013 Tahoe with only 13,000 miles on it. Sometimes when I am driving between 30 - 40 mph, I let my foot off the gas and coast, then when I slowly give it a little gas to maintain speed there is a rattle sound coming from underneath the truck. If I hit the gas pretty good it does not do it. Only when I give it just a little gas. I had a BB tune and Airaid Jr. and took both of them off and went back to stock and it's still happening but not near as often. I was using 89 grade gas from Exxon with the tune and just went back to 87 without tune. Could this be the AFM and if I took it to the dealer do you think they could tell or try to void the warranty?

 

[vt_hokie2008]

I have the rattle since installing an Airaid Jr. and have yet to figure out what it is. Hopefully someone on here knows???

 

[livingez_123]

Could it have something to do with the cylinder deactivation system/AFM?
Maybe a light pinging?

 

[Bogart]

Could it have something to do with the cylinder deactivation system/AFM?
Maybe a light pinging?

I watched the Instant Econ gauge on the DIC while driving home. It does seem like the pinging / rattle is when it goes from V4 to V8. Does it normally do that?

 

[992dr]

That sounds very similar to what is happening to me.

From what was explained to me its the DOD/AFM crap. It can be disabled.

Did you get your computer re-flashed back to the stock settings?

Mine started doing this after I got a converter and tune. Supposedly they disabled it but, it still does it only now it does it at the same speeds as you. Before it was doing it at around 25 to 35mph and at any speeds in OD.

 

[Bogart]

That sounds very similar to what is happening to me.

From what was explained to me its the DOD/AFM crap. It can be disabled.

Did you get your computer re-flashed back to the stock settings?

Mine started doing this after I got a converter and tune. Supposedly they disabled it but, it still does it only now it does it at the same speeds as you. Before it was doing it at around 25 to 35mph and at any speeds in OD.

I did flash it back to stock from the tune. It's not as bad as it was with the tune but it still does it. I got my Airaid and tune shortly after I purchased the vehicle so I don't really remember what is what like new. Not really sure if this is normal or there is a problem. I can't imagine this is normal. Not sure if I should take it to the dealer or not?

 

[vt_hokie2008]

My rattle is on the passenger side under the hood and is only heard under the right throttle condition and all I have is thr intake. Not sure if that's the same sound or if you ha e a different one???

Sent from my SM-N900V using Tapatalk

 

[Bogart]

My rattle is on the passenger side under the hood and is only heard under the right throttle condition and all I have is thr intake. Not sure if that's the same sound or if you ha e a different one???

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Mine is also the the same under the right throttle condition. It's kind of hard to tell where it is coming from. I think is sounds like it is from the middle of the vehicle but it doesn't sound like it is from the engine. It sounds like it might be underneath.

 

[992dr]

I did flash it back to stock from the tune. It's not as bad as it was with the tune but it still does it. I got my Airaid and tune shortly after I purchased the vehicle so I don't really remember what is what like new. Not really sure if this is normal or there is a problem. I can't imagine this is normal. Not sure if I should take it to the dealer or not?

My original issue was this slight shudder at highway speeds. Anything in OD and it would shudder if I cruised at that speed for even the shortest amount of time. I should have let it be, hah.

Mine did not do it at all before I got the converter, shift kit jr and tune installed. It was weird when it did happen because it happened at very low speeds (20 to 35mph) it would also happen at 40+mph. Now it only does it at 40 to 45mph. I can not drive at those speeds. This is supposedly after they tuned it out.

I have read a little about it but have not seen much about issues, besides what we have reported. Disabling it should get rid of it. Someone on here has posted a thread about deleting it by using pushrods. I have a link to a kit that deletes it all together but, its a pretty involved install and you need a new cam. I'm going to consider this in the future, I think.

Mine is also coming from the middle and doesn't sound like its coming from the engine.

It would be nice if the dealer would eat this repair to eliminate the whole dod/afm crap.

 

[doubletapdrew]

Have you had your transmission dipstick tube recall done? If it's cracked they'll replace the tube and put a neoprene insulator on it, if not they'll just put the insulator on it.

 

[Bogart]

Is the transmission dipstick recall on the 2013's? If so, I have not had it done.

 

[992dr]

Mine is also the the same under the right throttle condition. It's kind of hard to tell where it is coming from. I think is sounds like it is from the middle of the vehicle but it doesn't sound like it is from the engine. It sounds like it might be underneath.

I took a couple of friends out over the weekend. I explained what was going on before we left. That vibration happened and the rear passenger said "it feels like its the rear-end" and "I felt it under my butt".
The sound is coming from the center like yours. I'm bringing it by a local gear supply/rear-end shop tomorrow for the to try to diagnose the situation.
Hopefully something positive will come out of this.

 

[doubletapdrew]

Is the transmission dipstick recall on the 2013's? If so, I have not had it done.

I think so but I'm not sure, might be up to '12. If you PM me your VIN it'll let me know if it's flagged to be done.

 

[Bogart]

Update - I had Justin at BB send me my tune with the AFM disabled and I think it fixed all of my problems. The last two days no more rattle when going from V4 to V8, no more bad shifting or horrible drone in and out of V4. Drives like a real vehicle now. Hopefully the mpg's don't take a big hit. Anyone know of any long term problems caused by disabling AFM?

 

[Cha0s13]

Doesnt the deletion of the AFM stop the engine from going into v4 mod completely?

 

[Bogart]

Yea, that is my understanding. When I watch the instant econ gauge it only stays in V8.

 

[Cha0s13]

Yeah my 08 Tahoe had horrible drone when switching to v4 mod, drove me crazy. I traded the 08 for a 2014 in Dec, and so far the switch from v8 to v4 creates no drone at all

 

[992dr]

I took a couple of friends out over the weekend. I explained what was going on before we left. That vibration happened and the rear passenger said "it feels like its the rear-end" and "I felt it under my butt".
The sound is coming from the center like yours. I'm bringing it by a local gear supply/rear-end shop tomorrow for the to try to diagnose the situation.
Hopefully something positive will come out of this.

After getting the rear re-built and having a true trac installed. It still has the same symptoms. Great.
Though it did resolve a lot noise from the rear-end and the clunking is gone. It is tighter and very quiet. Some good came out of it, hah.

I was told my afm was disabled. Is the afm and dod two separate tables that need to be disabled? I was told my dod is, not sure about the afm.
All this technological crap is getting to be riduclous.

 

[badnova]

Engine rattle "chuggle"

My 2012 Denali had the ratttle "chuggle" since day one. I've owned 4 and this is the only one that has it.
I am working with a GM Tech rep. We changed the plugs and coils, had some random clyinder misfires no difference
I believe it is a programing issue

 

[spanish]

I have a GMC Yukon 1999 with 147000 miles, and a few months ago I notice the "rattle" sound coming from under passenger side I couldn't figure out what was the problem until my engine light came on and I got a P0430 code bad cat or o2 sensor bank 2 , which I can't figure out which is what since I have two cats two pipes four sensors $$$$$