mjj

Did you have your vibration from basically day one and as you put more miles on the truck did it seem to slowly get worse?

Nope, not with mine. Could it be that the idle RPM is a tade too low now? Would that be something they'd have adjusted?

I've only noticed hearing it a few times from outside the cab.

Whaaat, there's an app for that? Why have I been using Excel.... Here's my log since the truck was new. Almost exclusively using E85 so you can see the comparison vs regular fuel but I'll have to do a few fill-ups with 87 now that the weather is warmer for a better idea on what my true cost savings may or may not be. Also interesting to see that the DIC mpg is always high.

So I wonder if overall the catch cans will collect less in the new ecotec3 engines? "PCV-integrated rocker covers: new domed rocker covers house a patent-pending integrated positive crankcase ventilation system that enhances oil life, reduces oil consumption and reduces exhaust emissions. The domed sections of the covers contain baffles that separate oil and air from the crankcase gases, with about three times the oil/air separation capability of previous engines." Read more: http://gmauthority.com/blog/gm/gm-engines/l83/ Still keeping my can installed but hopefully this new engineering will prove to be true and prevent less oil from getting to the intake for all those who don't want to deal with the maintenance of emptying a can.

You describe pretty much exactly how my truck acts on the freeway including how it acts on inclines from day one. I have 20 minutes of freeway each way in my work commute. Its not the route because I notice in others freeway stretches too. Also my 2005 never ever did this on that same commute. I don't think it's tires and this is why. My 2005 had larger AT Toyo tires with about 5000 miles on them. When I traded it in I wanted to keep them so I had the dealer remove the stock Bridgestones off the 2014 and put my Toyos off my 2005 onto it. Could they have possibly not balanced them correctly? I suppose but it would seem like I'd notice the issue at others speeds as well. 30, 50, etc, no vibrations. 80-90+, I've tried that and do not feel it at the higher speeds either. I have not had the dealer check it out yet. I plan on having them do it with my first oil change that should be coming up within the month. I almost think mine has gotten a little worse the past few weeks. But maybe its just gotten into my head who knows.

Nothing was plugged, made sure of that many times, as did the dealer. There was this one on the front side of the engine and on the back there was another. Poor design on GM's part. You can't convince me otherwise after what I've seen and experienced on that model. I just think GM has developed better ways to handle this on the newer vehicles. Live and learn....

As do I. And if you haven't experienced what that frothy mix can do take a look at this pic.Now this isn't a truck but but was my wife's Acadia which I think still shows a good example. The PCV hose dumps into the middle of the air duct going from the air filter box to throttle body. You can see the frothy mix pooled in the duct and the throttle body directly to the left. The MAF sensor is to the right of the pooled froth. Once I discovered it collected there I'd have to clean it out every week or two in the winter. Probem was, at least what I suspect was happening, was when you punched the gas petal this froth would get sucked into the throttle body as the vehicle would stumble and shutter under most WOT situations. It would also randomly throw check engine lights. The MAF sensor went bad, again my suspicion was that this froth sloshed backwards possibly while going around corners etc and came into contact with the MAF sensor eventually ruining it. This I now refer to as GM's cheap version of a crappy catch can. It may work fine in warm climates but not colder ones like where I live. I would rather play it safe and try to prevent a lot of this from getting to the engine than be sorry with my new truck.

Wow it does hold a decent amount more. Make sense. Thanks.

Can anyone explain why this is? Summers are more humid, the warmer air can hold more moisture, and people complain about dry skin and use humidifiers in the winter. So it seems it'd be the opposite but it's obviously not.?????

Really? I don't recall them mentioning this during the purchase and paper signing process. I guess I should start paying closer attention in the future on these types of larger purchases. Just out of curiosity I'll have to take a look back thru my paperwork.

Crazy again how we all notice varying vibrations. Mine is worst accelerating uphill between 70-80 where you can feel the entire truck start to vibrate. Other than that I usually just notice the petal vibration. When you guys say you feel it in the steering wheel do you feel it on the wheel itself or more so on the center column part where you'd honk the horn. I can always feel a slight vibration if I place my hand on the center part but not the wheel itself. I've paid attention recently while driving other make vehicles and the center steering wheel vibration seems common or normal but I have not notice a gas petal vibration in other makes. I agree it sure would be nice for GM to get this figured out. I have no idea how hard or easy diagnosing vibrations can be in a modern vehicle but it seems like with today's advancements in technology they'd have done it after 2 years now. Overall I sure do like my truck a lot though. Here's to hoping it tows good this summer.

Yes, it is odd it happens at different speeds. I'm never cruising much between the 20-30 speeds so can't say I've noticed it there. But cruising at 75 i feel it in the gas petal which is annoying and I usually put the cruise on. I guess Chevy has me trained as well....

Funny thing is I have a slight vibration between 70-80 and I seem to get my best fuel economy at right about 75 where I notice it the most. Go figure. My first oil change should be coming up soon so we'll see what happens.

When I originally put mine on I left the hoses long to make sure it was going to work in the location I chose. I noticed the hoses had a slight oval shape also. After I cut them shorter I have not noticed it doing that.

Just choose the v8 model and put in the order notes it's for a 4.3L. I am pretty sure they are the same kit. I ordered one for a v6 Camaro originally planning on installing in an Acadia but then ended up using it in my v8 truck. All the included parts including mounting bracket worked for me. Or just email them, that's what I did and they were very helpful. I just emptied mine again after about 500 miles and had about 5 oz of the oily watery mix.

I've also noticed the mechanical noise on my 2014 when in auto 4wd and 4wd hi. The noise is always present when either are selected. It's not a grinding noise or anything and it doesn't vibrate or feel abnormal just a noise that my 2005 with the auto 4wd system (and over 100k miles) never made a noise like this. I've never noticed a high pitched electrical noise in the 2014. I figured I'd ask the dealer at my first oil change to check it out though.

I can share my experience with my wife's Acadia that had a DI motor. At around 100k miles it started running a little rougher, would stumble on acceleration, and started throwing check engine lights. The air intake tube from the air filter box to the throttle body where the pcv tube emptied into would fill up with the oily milkshake and I'm sure it was getting sucked back into the engine. It caused the mass air flow sensor to go bad, the valves were all gunked up, and they had to do a top end engine cleaning to get it running good again. Costed hundreds and hundreds of dollars and multiple trips to the dealer for them to figure it out. I ordered an Elite CC for it but ended up putting it on my new truck as we decided to trade in the Acadia for a smaller more fuel efficient and non DI motor SUV. After going thru that experience and seeing how much it collects in my truck there is no way I would not use one now. My father is looking to get a new Chevy truck and I'll be sure to convince him on a catch can for it and unfortunately caution him to look out for the shakers and vibrators out there. On a side note, sorry to go a little off topic, but do any of your 10-15 friends have any of the vibration issues discussed in other threads?

I get 99 mpg in V4 mode going downhill. Haha, just joking around. Yesterday my last 25 was 19 mpg and last 50 was 17.2 mpg. Mostly flat highway 55-70 mph and using E85 (69%). No lift but larger heavier LT285/70R17 tires. I think the best I've ever gotten so far on E85.

I've had no major issues. Their support helped me out with some adjustments when I felt it hesitated too long on shifts with their new Diablo flex tune so I've been happy with it. On the Diablosports website forum they recommended starting at +15 for the throttle boost and tweaking from there. I have my 2014 set at +10 and it seems good, much better than stock. I have not done as much with the shift pressure. I've set mine on the firm shift tcm then about +3 for each shift and torque management off. This I read as a recommendation from another forum member and it seemed ok. I ended up settling on the hard shift tcm without any adjustments and leaving torque management turned on as I got a lot of wheel spin with it off under fairly normal driving. If you like to spin your tires off the line and continue shifting into second set it to hard and TM off haha.

That's understandable. I just found it interesting that there was that much of a difference between the two sides. Seems like with an automated assembly process and machines doing a chunk of the work everything would line up perfectly. And that also makes it seem like there'd be no vibration issues with em too and thats not the case.

Who knows if this would cause any sort of vibration but I found this a little odd. Maybe it's normal or within spec who knows but I thought I'd share. It finally warmed up enough over the weekend so I could put my mud flaps on when I noticed on the rears I had a harder time fitting my fingers and hand in behind the wheel on the passenger side trying to put the screws back in the wheel well. So I took a measurement and found the passenger side rear wheel 1cm closer to the back of the wheel opening than the drivers side. I verified the 1cm difference measuring towards the front of the wheel openings too. Anyone else ever notice this or care to take a quick measurement on yours? What do you guys think of this?

Did your front diff make any noticeable noise when in Auto or 4wd? I can almost always hear mine when in either. I never heard anything with my 2005.

They must have just recently got those docs together. Steve answered a number of questions for me about a month ago when I went to order mine but they didn't have instructions for the ecotecs then. He was very quick to respond, no complaints. But if you have the same regular size can I have you might be surprised how fast it fills up. I had mine full after a week and only 350 miles. It's mostly water but I'm now dumping an oz or 2 every few days. I live in MI. Honestly I really like the can but would prefer one that held a much larger quantity.

I think you are thinking backwards just like I did. Exit of the can goes to the drivers side. Take a look at chevy2tuff2006's post #622. He explains it pretty well.