Jump to content

Weird Idle

Jettech1
 Share

Recommended Posts

Jettech1 Senior Enthusiast

Jettech1

Posted
Posted

I think this topic has been mentioned before but from day 1 with my beloved 22 Custom model gasser, it has a weird idle.  It will bump a bit.  It's not smooth at all and never has been.  Not that it's been a problem ever.  It's just weird that this amazing engine has this weird bumpy idle.  I don't get it.  It has never stalled, it just has this, I don't know how to explain it....Not smooth idle is the best I can describe it...lol...After over 37k miles...it's still the same from new and has never changed.  Odd...

Another JR Senior Enthusiast

Another JR

Posted
Posted

That’s odd. For about the first 30 to 60 seconds after a cold start, my 2021 has a minor bump every few seconds that make me wonder if they are misfires, but it pretty quickly settles down to a very smooth idle. By the time the water temperature is coming up, it’s completely smooth. Have you checked for misfire codes or put a monitor on it to see if it detects misfires?  

  • Like 1
Chuck FB Enthusiast

Chuck FB

Posted
Posted

Like Jon explained with his, I will sometimes notice what seems like the odd misfire when its started cold although by cold I mean above the freezing point ( I haven't used it enough yet in actual cold Canadian weather to know its reactions ). Initially when it starts its revs up quite a bit but its after it settles down that I have noticed it but only sometimes if I am standing by the front of the truck. When its warmed up or shut off for a while at stops in town I haven't noticed anything. 

 

So your issue, can you tell its doing this as your sitting in the truck and not only hear it but feel the truck have a reverberation travel through objects in the cab. Also what does it do when its warmed up and your in drive with your foot on the brake as that causes a small load on the engine. If you have not taken it to a dealer and not sure if it would have diagnostic warranty coverage now but to have it checked to see if its showing misfires or of course if you have your own fancy diagnostic tools ( I am guessing you don't own ) or have an independent shop you know well to do the check. Also and this may sound odd but when its doing this go to your tailpipe and not only listen but hold the palm of your hand in the exhausts air flow and feel for the disrupted puff feel, if you've been around crappy running carbed engines you will know what I mean !. 

  • Like 1
Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted
On 11/29/2025 at 6:09 PM, Chuck FB said:

Like Jon explained with his, I will sometimes notice what seems like the odd misfire when its started cold although by cold I mean above the freezing point ( I haven't used it enough yet in actual cold Canadian weather to know its reactions ). Initially when it starts its revs up quite a bit but its after it settles down that I have noticed it but only sometimes if I am standing by the front of the truck. When its warmed up or shut off for a while at stops in town I haven't noticed anything. 

 

So your issue, can you tell its doing this as your sitting in the truck and not only hear it but feel the truck have a reverberation travel through objects in the cab. Also what does it do when its warmed up and your in drive with your foot on the brake as that causes a small load on the engine. If you have not taken it to a dealer and not sure if it would have diagnostic warranty coverage now but to have it checked to see if its showing misfires or of course if you have your own fancy diagnostic tools ( I am guessing you don't own ) or have an independent shop you know well to do the check. Also and this may sound odd but when its doing this go to your tailpipe and not only listen but hold the palm of your hand in the exhausts air flow and feel for the disrupted puff feel, if you've been around crappy running carbed engines you will know what I mean !. 

It's weird.  Been there since day one.  Just a little bump here and there, cold/hot, doesn't matter.  Outside temps. don't matter either.  I guess it's just what it is.  Never been a problem and I can't see it ever being a problem.  I was just wondering if others noticed the same thing is all.

  • Like 1
Chuck FB Enthusiast

Chuck FB

Posted
Posted

It is odd or at least compared to my one 6.6 vehicle I have been around much as an example. Do try the hand test at the tail pipe though, without burning your hand in the process of course 😉

Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted (edited)
4 minutes ago, Chuck FB said:

It is odd or at least compared to my one 6.6 vehicle I have been around much as an example. Do try the hand test at the tail pipe though, without burning your hand in the process of course 😉

I have no codes so that eliminates the mis fire.  It's just weird.  But it's ok.  The smoothest idling and running car I've ever had was a 95 E320 Mercedes.  That straight 6 was the most amazing engine along with being powerful and efficient.  I was stupid and bought a 2000 E320 with the V-6.  Nothing but problems with that damn thing.  That's the last Benz I ever bought.

Edited by Jettech1
  • Like 1
Pryme Senior Enthusiast

Pryme

Posted
Posted (edited)
11 minutes ago, Jettech1 said:

I have no codes so that eliminates the mis fire.  It's just weird.  But it's ok.  The smoothest idling and running car I've ever had was a 95 E320 Mercedes.  That straight 6 was the most amazing engine along with being powerful and efficient.  I was stupid and bought a 2000 E320 with the V-6.  Nothing but problems with that damn thing.  That's the last Benz I ever bought.

I’ve felt what you’re talking about. It’s just the way the engine is. I don’t think about it. 
 

now if you want to feel, or not feel, a silky smooth v8, drive a first gen LS400 Lexus. Eerily smooth and silent. Those cars were next level when they came out. 

Edited by Pryme
  • Like 1
Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted
1 minute ago, Pryme said:

I’ve felt what you’re talking about. It’s just the way the engine is. I don’t think about it. 
 

now if you want to feel, or not feel, a silky smooth v8, drive a first gen LS400 Lexus. Eerily smooth and silent. Those cars were next level when they came out. 

YES!!  I was going to buy one when they first came out.  They were phenomenal.  I ended up buying an Acura Legend Coupe in 92 for my wife.  That car was amazing as well but looking back I wish I had bought the LS400.

  • Like 1
Jettech1 Senior Enthusiast

Jettech1

Posted
  • Author
Posted

Those were amazing cars.  A 92 Legend Coupe and a 95 E320.  The good old days...lol

92 Legend 04.jpg

e320 110.jpg

  • Like 2
customboss Senior Enthusiast

customboss

Posted
Posted
On 11/24/2025 at 5:34 PM, Jettech1 said:

I think this topic has been mentioned before but from day 1 with my beloved 22 Custom model gasser, it has a weird idle.  It will bump a bit.  It's not smooth at all and never has been.  Not that it's been a problem ever.  It's just weird that this amazing engine has this weird bumpy idle.  I don't get it.  It has never stalled, it just has this, I don't know how to explain it....Not smooth idle is the best I can describe it...lol...After over 37k miles...it's still the same from new and has never changed.  Odd...

Engine mounts ? 

Another JR Senior Enthusiast

Another JR

Posted
Posted
1 hour ago, customboss said:

Engine mounts ? 

I’m thinking leaky injector. You get a bump when it drips. It’s not a misfire, but it often feels like one.  Just guessing, though. 

  • Like 1
bruceb58 Enthusiast

bruceb58

Posted
Posted
20 hours ago, Pryme said:

now if you want to feel, or not feel, a silky smooth v8, drive a first gen LS400 Lexus. Eerily smooth and silent. Those cars were next level when they came out. 

They are great cars as long as you never have to change a starter in them. Don't ask me how I know.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,778
    Total Members
    8,960
    Most Online
    daveishi
    Newest Member
    daveishi
    Joined

  • Who's Online   2 Members, 0 Anonymous, 849 Guests (See full list)

  • Latest Articles

  • Posts

    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Because that is IDIOTIC, much like this question. They've already been forced to do it by past administrations - why would you roll that back when it's a GOOD thing?  WHO IS ARGUING FOR LOWER MILEAGE???? 😂  NOBODY IS!!   I'm certainly not! What I want is RELIABLE vehicles again that are worth the price paid!    I don't get your logic here ...   In 2003 I paid $2,200 for our '86 Grand Marquis. It's STILL running and I've never been inside the engine, aside for the timing cover since it was leaking, so I threw a new timing set in since that makes sense. Transmission is ORIGINAL. Electric pump in the gas tank is ORIGINAL. Rear end is ORIGINAL. I'd have to hit my head REAL hard to want to pay $60k or more for a car that still can't come close to the comfort, seating and storage space, or reliability of this one. Nothing is even in the ball park! Hundreds of thousands of brands and models have been built and sent to the crusher while this one keeps on going!   https://postimg.cc/Z9XRrCSg   I've got a whole fleet of cars, motorcycles, and a truck close to this age for summer and winter. No one could pay me enough to buy anything built this century. I have zero use for any it.
    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      Since I'm the one who has to fix them when they break, I'll take vehicles over 30 years old all day, EVERY day, over ANY modern crap. Have you attempted any repairs on anything built after 2006? It's a friggin nightmare, and gets worse the newer the model year.    If I had the will or desire, I can make any car of any age outside of a Model T (I don't have THAT much will ...) just as powerful, comfortable, and have all the tech the new stuff does, and get pretty close in mileage, too. I prefer SIMPLICITY. The less the vehicle has, the less to fix WHEN it breaks, not IF.   I'm glad you snot-nosed punks don't like them. More for us, plus that keeps the prices from climbing more than they already have.👍
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.
    • cautious optimist
      2027 GMC Sierra: Official Discussion

      By cautious optimist · Posted

      Bringing this thread back on topic. I just noticed the incredible lack of bright chrome across the entire new lineup. Even the Denali has tinted the brightwork in the grille and has none elsewhere. None of them have chrome bumpers. As far as I can tell there aren't even chrome mirror caps. I'm curious if this also happens out back? Are there no chrome rear bumpers either? This is quite the departure for GMC.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...