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Discussion Starter · #1 ·
Build data 5/1/2014 Vin # 24161. Mileage 2936 Z51, manual
I just did a 2000 round trip drive to Canada. Overall the car worked well, but I did notice some things that bothered me. In 7th gear (touring mode) doing above 65 when I putting it under additional load, I got this feeling that the car was missing, no codes, pulled away fine, just did not seem to feel right. I did have a run for about 60 miles at between 95 MPH and 105 and except for this miss/lugging feel issue everything was great. Also I noticed that the console door is not really that counter balanced and once it gets past the opened locked position, it just slams shut. I don’t recall this happening in my C6.
Also I’m not a big fan of the econ mode, not sure it really buys much unless you are driving on the salt flats. It’s kind of annoying when it kicks in and out and I can feel and hear the difference.
Anyone else noticing these things?

Jim
 

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I try to stay out of 7th unless I'm on flat ground and running 80+, because the car seems unhappy otherwise (not many flat roads in KY/TN). I'm not experiencing any missing though.


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Try more 6th gear around those speeds. 7th seems to only be for very high speeds (probably ~80+) or completely flat to downhill stretches. Not only will the engine not feel like it's lugging as much, but the Eco mode will be able to stay in v4 mode instead of constantly switching back and forth, giving better fuel economy overall. That's what I've noticed anyway, would be interested to hear other's opinions.
 

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I just did a 2000 round trip drive to Canada. Overall the car worked well, but I did notice some things that bothered me. In 7th gear (touring mode) doing above 65 when I putting it under additional load, I got this feeling that the car was missing, no codes, pulled away fine, just did not seem to feel right.
I noticed a similar effect on a recent trip I made (also around 2000 miles). At 65 in 7th gear, the engine RPM was around 1100-1200 as I recall, which seems to be a bit low. I also encountered the "lugging" effect you described, but in my case I attributed it to AFM operation. 6th gear seemed to be a better option at 65 mph. When cruising at 77 MPH (70 MPH speed limit), the car was happier in 7th gear (operating at a higher RPM).

I did have a run for about 60 miles at between 95 MPH and 105 and except for this miss/lugging feel issue everything was great.
I'm surprised that you still encountered lugging at those speeds, given that your engine RPMs would be higher at those speeds.

Also I noticed that the console door is not really that counter balanced and once it gets past the opened locked position, it just slams shut.
Same here - I was surprised the first time it snapped shut. A damped spring would be a nice future fix for 2015 and later models.

Also I’m not a big fan of the econ mode, not sure it really buys much unless you are driving on the salt flats. It’s kind of annoying when it kicks in and out and I can feel and hear the difference.
Under many driving conditions, the V4/V8 transition is not noticeable for me, but for other conditions (especially in higher gears when RPMs are low) it is notable. Still, I really like the ECO mode, and as others have pointed out under many cruising conditions higher fuel economy can be achieved in 6th gear versus 7th.
 

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My experience after 3500 miles is that 7th gear is usually not necessary unless you will be on a long stretch of flat road @ 70 mph+.

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I've put mine in 7th gear at 60-70 MPH on A decline.I don't notice any lagging.If I start uphill I automatically drop in down to 6th.
 

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Pete; Just to cover the base: Check your coil-pac wires to the spark plugs. I've read similar complaints from other owners that found a loose spark plug lead on at least one cylinder.
 

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Pete; Just to cover the base: Check your coil-pac wires to the spark plugs. I've read similar complaints from other owners that found a loose spark plug lead on at least one cylinder.
Chip, why wouldn't that throw an error code on the DIC? If not all eight cylinders are firing correctly (or all four, if in V4) I would think that should immediately throw a CEL and error code.
 

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Rodney; I would think so , but the posts that I had read did not mention a CEL. Perhaps intermittent contact that a loose connection could provide fools the engine ECM, but that seems unlikely. Having said this, I've seen stranger things happen with this car's ECM's.
 

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Discussion Starter · #11 ·
Pete; Just to cover the base: Check your coil-pac wires to the spark plugs. I've read similar complaints from other owners that found a loose spark plug lead on at least one cylinder.
I read that also and have check the ones I can get to without taking the engine bay apart. All is well as far as I can see. Im going to put my code reader on the car and see if there are any codes.
 

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Discussion Starter · #12 ·
Just checked for codes, none! Have to see if I can reach the other packs and check if the are loose.

I do see the springs in the console cover, but not sure they do much except slam the cover harder.

Thanks Jim
 

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I read that also and have check the ones I can get to without taking the engine bay apart. All is well as far as I can see. Im going to put my code reader on the car and see if there are any codes.
You would hear this as car winds up though. If missing, it's missing. And I believe the comp would pick that up. Not positive though. I would agree, if you have a fine ear like I do, at low rpms, and when road noise is low, car doesn't sounds great and you can hear the fuel injectors in the engine pay. That's that putt noise.

Also keep in mind that the perf exhaust valves open at idle, but once moving, if you are below I beleive 2k rpm the valves close up. You can notice this in 4th gear. Dip below 1500. Hit the gas, and exhaust will open once you get past that 2k or so rpm range.
 

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Can you keep code reader going while simulating issue?
 

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Discussion Starter · #15 ·
Can you keep code reader going while simulating issue?
I can as its a Scan Gauge which allows you to get info live from your ODB II port for cars that don't have that info available as they are too old. I'll give that a shot on my next long run. You think codes are not stored if they trip one?

Thanks Jim
 
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