[pabex]

Originally Posted by LT4Greg

No it’s normal pabex! It’s an LT1 6.2 liter 455 hp V8 engine! Nothing wrong!��

My boi Greg, always re-assuring me

[DannyC]

I thought mine was idling a little rough also. I put some Seafoam in and it did help.

[hotrod803]

Originally Posted by caSStro18

Maybe go to the dealership and start up some of the new cars on the lot. They're not 2018's but the new SS's have the same engine. See if the others do it as well. I know mine does not idle smooth as silk. It's not a Honda Accord or a Toyota Camry. As long as you are not feeling any hesitating on acceleration, stalling out, loss of power, and you don't have any check engine lights coming on, I'd say it's probably fine. When I first start mine up and I'm standing behind it I can hear a definite almost misfire sound. It goes away once the engine is at normal operating temperature.

I hear the misfire sound also. That is what I meant by the loping sound I hear when I am inside the car.

[hotrod803]

Originally Posted by LT4Greg

I had a slight cam lope in my 2016 SS with the M6 and definitely my LT4 doesn’t have a smooth idle either. It’s the nature of the LT1 and LT4 engines. Don’t think you have anything to be concerned about as long as the car runs good and no CELs pop up! Enjoy the 455 hp and I would put the best gasoline(top tier) of at least 93 octane. I used Shell V-power when I had my SS and alternative between Shell and Chevron in the ZL1. Of course the octane available depends on the region of the USA where you live.

It sure is reassuring to know that its normal. I was a little worried...

[avalonandl]

These engines do have a rough idle. Put some seafoam thru it since it sat so long. And run premium fuel only.

[hotrod803]

Originally Posted by pabex

could you explain the exact feeling? I might have the same exact thing and is it dangerous? I also noticed today that it was way less when car got warmer compared to cold

I am having the same experience.

[zx9rmal]

I have the same issue. I do NOT believe it is normal or a high compression/cam symptom because the engine did not do this for the first 15K miles. It is a misfire and it happens the same way each time, and about 90% of the times I start the car. I start the engine cold, it starts to misfire after about 15-20 seconds, and stops a few seconds after that. All is good after that. Every time the same. Also, it only does this first thing in the morning, not even after sitting at work all day.

Perhaps an injector issue. I know the dealer will tell me nothing is wrong, so I'll bring it in if and when it gets worse.

[MrChrisLS3]

Originally Posted by metalhead79

Same here. Runs a bit rough after a cold start until it warms up.

Every V8 equipped pony/muscle car I've ever owned rocked the car a little during idle. It's normal... and awesome.

Same here, my '98 Z28 did it, my '96 LT4 Corvette did it, my 2011 SS LS3 Camaro did it, my 2017 Charger R/T did it, and my 2018 SS Camaro does it. Now, by a bit rough, I mean that it shake a little bit, typically in the transition from open loop to closed loop. As long as it isn't acting like it's out of gas, or experience hesitation on acceleration, or knocking or pinging, it sounds like normal operation of a 455 hp Chevy small block to me.

[pabex]

Originally Posted by MrChrisLS3

Same here, my '98 Z28 did it, my '96 LT4 Corvette did it, my 2011 SS LS3 Camaro did it, my 2017 Charger R/T did it, and my 2018 SS Camaro does it. Now, by a bit rough, I mean that it shake a little bit, typically in the transition from open loop to closed loop. As long as it isn't acting like it's out of gas, or experience hesitation on acceleration, or knocking or pinging, it sounds like normal operation of a 455 hp Chevy small block to me.

What do you mean by knocking and pinging? Thanks!

[LT4Greg]

Yeah MrChris, my 1998 SS had it plus a slight piston slap with the LS1 and of course my 2010 SS with the LS3 had a slight rough idle when cold starting too until the engine warmed up. The LS3 was worse than the LT1 that was in my 2016. My LT4 has slight rough idle too!

[c4racer]

LS6 in the C5Z had a pretty lopey idle for a factory motor. Worse than the LT1. It's pretty smooth all things considering. But it doesn't idle like a BMW or AMG or Porsche V8.

[Scottyz]

I can feel my LT4 shake the car here and there. Doesn’t feel abnormal by any means. Gives a small hint of cam chop here and there while idling.
When it shakes the car it’s just telling me it’s hungry and needs some cat or horse meat.

[s346k]

my car did the same thing. rough idle. it was the plugs. after swapping them for a fresh set, the car idles very smooth in all conditions.

stock cams “chopping” haha ok

[Scottyz]

Originally Posted by s346k

my car did the same thing. rough idle. it was the plugs. after swapping them for a fresh set, the car idles very smooth in all conditions.

stock cams “chopping” haha ok

I know. Wishful thinking. Absolutely nothing like the solid roller in my other car
But it does kinda feel cool when the car rocks back and forth a bit. Reminds me there is some good torque there.