Is anyone experiencing a rough idle??

NightfallZL1 · 05-17-2017, 10:37 PM

Ok so I didn't notice this at first but I seem to have somewhat of a rough idle you can feal it sitting in the car in park. I'm not sure if this is because of power/large camshaft or something is wrong. No check engine lights are on.

Glen e · 05-17-2017, 10:38 PM

Normal......

NightfallZL1 · 05-17-2017, 11:12 PM

Quote:

Originally Posted by Glen e

Normal......

Ok thanks 👍

unavailablezl1 · 05-18-2017, 07:08 AM

Quote:

Originally Posted by NightfallZL1

Ok so I didn't notice this at first but I seem to have somewhat of a rough idle you can feal it sitting in the car in park. I'm not sure if this is because of power/large camshaft or something is wrong. No check engine lights are on.

I have experienced it too. It is smoothing out some as it is getting broken in which is normal. It is smoother with the air conditioner on.

Comparing past cars, the GT350 was the same way. For one thing, it is just the way higher compression cars are and with breakin it gets better.

Also, take notice of one thing. When you first come to a stop, it is completely smooth, right? Then when you sit there a bit it gets a little rough. This is another way the car manufacturer's "save gas mode" at idle.

All is well.

NightfallZL1 · 05-19-2017, 12:57 AM

Quote:

Originally Posted by unavailablezl1

I have experienced it too. It is smoothing out some as it is getting broken in which is normal. It is smoother with the air conditioner on.

Comparing past cars, the GT350 was the same way. For one thing, it is just the way higher compression cars are and with breakin it gets better.

Also, take notice of one thing. When you first come to a stop, it is completely smooth, right? Then when you sit there a bit it gets a little rough. This is another way the car manufacturer's "save gas mode" at idle.

All is well.

Ok I'll check next time I drive it to see about what happens right when I stop.

kkriskal · 01-07-2018, 11:50 AM

I just bought a 2018 2SS Automatic couple of weeks back brand new with just 27 miles on the ODO. It has the rough idle from day one (pretty much feels like a misfire, like it jerks a bit which can be felt in the seat, to be exact, it is like it is skipping a beat once in a while, don't know how else to explain, I am Not an expert like the members here). It lasts for about 5 minutes or so and then starts getting smooth, once it is completely warmed up, it's completely gone (at least I don't notice it much). It now has around 700 miles and still the same, never taken to track, no abuse, following the break in recommendation. Only Shell Premium gas, also added the fuel injection cleaner at the dealership, still same behavior. This is my dream car so I am having sleepless nights with it, I would really appreciate if anyone can confirm if this is normal. Thanks in advance guys.

MP3BOOSTED · 01-07-2018, 12:17 PM

Quote:

Originally Posted by kkriskal

I just bought a 2018 2SS Automatic couple of weeks back brand new with just 27 miles on the ODO. It has the rough idle from day one (pretty much feels like a misfire, like it jerks a bit which can be felt in the seat, to be exact, it is like it is skipping a beat once in a while, don't know how else to explain, I am Not an expert like the members here). It lasts for about 5 minutes or so and then starts getting smooth, once it is completely warmed up, it's completely gone (at least I don't notice it much). It now has around 700 miles and still the same, never taken to track, no abuse, following the break in recommendation. Only Shell Premium gas, also added the fuel injection cleaner at the dealership, still same behavior. This is my dream car so I am having sleepless nights with it, I would really appreciate if anyone can confirm if this is normal. Thanks in advance guys.

my car started acting like this after cam install, very strange, my car starts to surge a lot, i'm actually going back and forth with my tuner to clean it up. subbed to get any feedback.

kkriskal · 01-07-2018, 12:26 PM

MP3Boost, thanks for your feedback. I have absolutely No mods done, it is completely stock and this is happening from day one. The service also checked it and said no codes, nothing. So yes, would really wait for some expert inputs from the members.

CRF8 · 01-07-2018, 12:43 PM

I’m no expert, and have no mods, but I do have a rough idle. No codes

Wierd Harold · 01-07-2018, 12:51 PM

Mileage? Give it a few thousand.If there is a problem guaranteed you will get a "check"engine light.as far as smoother idle with the air on,the ECM is signalled to bump up the idle to compensate for the extra load on the engine.Other checks could be made such as base idle speed,idle air control,mass air flow reading,but like as said need more miles

*mlee* · 01-07-2018, 12:53 PM

Totally normal... my 5th Gen Z did that too.

Wierd Harold · 01-07-2018, 12:53 PM

Are you running premium fuel?

kkriskal · 01-07-2018, 01:13 PM

Quote:

Originally Posted by Wierd Harold

Are you running premium fuel?

Yes, I am using Premium Fuel (Shell Premium V+Nitro thing from day one).

And thanks everyone for your feedback, so looks like this is normal. And per Mr. Harold's recommendation, I will give it a few thousand miles, it only has 700 on the ODO now.

BMWM.D. · 01-07-2018, 01:31 PM

This is the ZL1 section, and we have a different engine. So not apples to apples. But every modern small block I’ve owned has had a bit of a rough idle. It’s just how they are. There’s also a cat warmup routine (that usually retards the timing) that can make the idle rougher.

I’d say what you’re feeling is totally normal, and there probably isn’t anything the dealer can do about it. You can probably reduce or eliminate it with tuning software (bump idle speed, turn off catalyst warmup, etc.), but obviously there are consequences to that.

05-17-2017, 10:37 PM	#1
NightfallZL1 Drives: 2017 nightfall zl1 Join Date: Sep 2016 Location: Alabama Posts: 59	Is anyone experiencing a rough idle?? Ok so I didn't notice this at first but I seem to have somewhat of a rough idle you can feal it sitting in the car in park. I'm not sure if this is because of power/large camshaft or something is wrong. No check engine lights are on.

05-17-2017, 10:38 PM	#2
Glen e Retired from Car mfrs.... Drives: 2LT RS/HR-V Join Date: May 2013 Location: /Fort Lauderdale Posts: 10,048	Normal...... __________________ Glen CLICK HERE for detailing a new car: detailing for non detailers CLICK HERE for how to rinseless CLICK HERE for EASY wheel sealant

01-07-2018, 11:50 AM	#6
kkriskal Drives: 2018 2SS Triple Black Performance Join Date: Jan 2018 Location: Colorado Springs, CO Posts: 43	I just bought a 2018 2SS Automatic couple of weeks back brand new with just 27 miles on the ODO. It has the rough idle from day one (pretty much feels like a misfire, like it jerks a bit which can be felt in the seat, to be exact, it is like it is skipping a beat once in a while, don't know how else to explain, I am Not an expert like the members here). It lasts for about 5 minutes or so and then starts getting smooth, once it is completely warmed up, it's completely gone (at least I don't notice it much). It now has around 700 miles and still the same, never taken to track, no abuse, following the break in recommendation. Only Shell Premium gas, also added the fuel injection cleaner at the dealership, still same behavior. This is my dream car so I am having sleepless nights with it, I would really appreciate if anyone can confirm if this is normal. Thanks in advance guys. Last edited by kkriskal; 01-07-2018 at 12:16 PM.

01-07-2018, 12:43 PM	#9
CRF8 Scenic City Camaro Drives: 2022 Camaro ZL-1 /1974 Firebird 400 Join Date: Jan 2014 Location: Chattanooga TN Posts: 578 View My Garage	I’m no expert, and have no mods, but I do have a rough idle. No codes __________________ 2022 Camaro ZL-1, grey 1974 Firebird Formula 400, white https://www.facebook.com/groups/Camaro/ https://www.facebook.com/CRFinTN/?modal=admin_todo_tour

01-07-2018, 12:53 PM	#11
mlee CamaroFans.com Drives: ZLE & ZR2 Join Date: Oct 2008 Location: Conroe, TX Posts: 37,496 View My Garage	Totally normal... my 5th Gen Z did that too. __________________

01-07-2018, 12:26 PM	#8
kkriskal Drives: 2018 2SS Triple Black Performance Join Date: Jan 2018 Location: Colorado Springs, CO Posts: 43	MP3Boost, thanks for your feedback. I have absolutely No mods done, it is completely stock and this is happening from day one. The service also checked it and said no codes, nothing. So yes, would really wait for some expert inputs from the members.

01-07-2018, 12:51 PM	#10
Wierd Harold Drives: 2017 2lt rs Join Date: May 2017 Location: Ontario canada Posts: 332	Mileage? Give it a few thousand.If there is a problem guaranteed you will get a "check"engine light.as far as smoother idle with the air on,the ECM is signalled to bump up the idle to compensate for the extra load on the engine.Other checks could be made such as base idle speed,idle air control,mass air flow reading,but like as said need more miles

01-07-2018, 01:31 PM	#14
BMWM.D. Drives: ZL1/335i Join Date: Apr 2014 Location: Santa Barbara Posts: 870	This is the ZL1 section, and we have a different engine. So not apples to apples. But every modern small block I’ve owned has had a bit of a rough idle. It’s just how they are. There’s also a cat warmup routine (that usually retards the timing) that can make the idle rougher. I’d say what you’re feeling is totally normal, and there probably isn’t anything the dealer can do about it. You can probably reduce or eliminate it with tuning software (bump idle speed, turn off catalyst warmup, etc.), but obviously there are consequences to that.

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