is this normal for my car?

[killaj131]

I have a 2013 lt auto, and maybe its just me and i never noitce it till now, I have just about 3700 on it, so when I go up a hill and push the gas its good but when im just about to go down a hill and still on gas and then let off, the rpm still revs for like 3 sec or also when I'm going down a hill and its about to go into a lower gear it seems like the rpm dial goes back and forth just slightly not to much, and this is when I'm coasting down hill also. I know.it may sound Like Wtf is he talking bout lol, but any answers? Thanks and like I said I just saw this happen like yesterday and today.

 

[doreo]

the auto's are a little funky so id say its normal. The trans tune helps alot but even now my auto does some funky stuff.

 

[ChrisJ]

When I had my 1.8 auto if I was stuck in traffic going up a hill slow when we would finally go over the hill it would hold too low of a gear with almost no pressure on the throttle. So I'd end up taching at like 3500-4K and barely touching the throttle then it would finally upshift.

Was like the hill sensor was buggy or slow. Overall I liked the trans though for an auto.

 

[chivalryder]

I know cruise control will upshift while going downhill to try to reduce acceleration.

I have a manual transmission and when I lift the throttle and depress the clutch, the engine will "hang" for half a second before letting the rpms drop. I have spoken to other GM owners and this is normal across all of their new cars (I cannot confirm this statement with regards to Corvettes). I will not be surprised at all if the it is the same with automatic transmissions.

You will also notice that when the car is idling or below 2k rpm and you stab the throttle, there will be a moment of hesitation before the engine will respond. This is a tactic the engineers employ to help reduce fuel consumption. It prevents extra fuel consumption from people's inability to hold a steady foot, or when someone is starting from a stop, they tend to apply more throttle than they want and unconsciously pull back a bit right after.

All of these extra features have been brought to you by drive-by-wire, and account for the disconnected feeling you get when driving any new car.

Don't get me wrong, I love this car, but I yearn for the day someone comes out with a bare-bones, stripped out coupe that doesn't have all this extra engineering in it.

 

[killaj131]

Cool thanks for the info guys!

 

[killaj131]

Its also been very humid and 97 degreesout when.this is happens, so maybe that could also have something to do with it.

 

[chivalryder]

Its also been very humid and 97 degreesout when.this is happens, so maybe that could also have something to do with it.

I've had it happen in all weather conditions, ranging from 15 below freezing to 100+ with high humidity. I've found the 1.8 to be a very resilient engine. The only time I've noticed a change in performance is the first few minutes after starting from cold, especially when it's 10C or cooler outside.

The transmission is even more susceptible to colder temps. One must be very delicate when shifting a cold transmission. She doesn't like to change gears (manual transmission).

 

[DrumMedic]

Mine does this as well. I typically drive mine in manual mode in hilly areas to avoid this because it is pretty annoying.

 

[Scotiez]

In eastern North Dakota we don't have any hills, but it was very windy, 35-40 mph winds that I was buckin. My Sonic did the same thing once in a while trying to maintain the speed of 76mph. I turned off the cruise and it worked just fine. I have never had this happen on a calm day on the interstate.

 

[geeturbo]

If the AC or even the defroster is on it could cause idle changes as the compressor cycles on and off

 

[davecerv]

Does anyone else have a Sonic that randomly blows out hot air for about 20 seconds when the fan/ac/heater isn't even on? It doesn't happen everyday though, two times this month so far.

 

[Chevrolet Customer Care]

Hello All,

Has anyone been able to have your Chevrolet dealership look into this for them yet? Please be sure to keep me posted. If you would like my assistance please do not hesitate to reach out via private message.

Erica Tiffany
Chevrolet Customer Care

 

[barch88]

Does anyone else have a Sonic that randomly blows out hot air for about 20 seconds when the fan/ac/heater isn't even on? It doesn't happen everyday though, two times this month so far.

Yeah. I asked about this and people said it's normal, has to do with keeping fresh air flow into cabin.

http://www.sonicownersforum.com/forum/general-discussion/8706-my-heat-randomly-turns.html

 

[davecerv]

Ohhh alright. Now when I'm not using the ac I just move it to the foot vents so I won't notice haha.

 

[cheddarlump]

The hanging throttle thing: On most newer cars with an electronically controlled throttle, they purposely slow the rate at which the throttle snaps shut to control NOx emissions. It's annoying as hell, but EVERY manufacturer does it for this reason (all hail the iron fist of the EPA and green tree-hugging f-tards).