Rough idle

[kapinallinen2]

Do you think upping your idle would help?

Pretty sure that is not something we can do?

 

[kdoublep]

You can with the correct software. I think Tazer or jscan can do this. I know some people have done this. I want to but I got AlfaOBD and you can't with Alfa.

 

[23RAM]

I have a 2021 Ram classic and it does the same thing. My 3rd Dodge and I should’ve learned my lesson by now. Bought it with 8k miles now at 36 and the whole time I’ve owned it, it shakes the cabin at idle like you’re in a massage chair. Dealer was no help and said it was normal. No codes no answer or solution I could find to the problem I’ve learned to turn the music up and live with it so I don’t notice how annoying it is. New spark plugs and all the injector cleaner Ive used. Better gas and no difference

That doesn't sound like rough idle, that sounds like a misfire. The PCM won't throw a code unless it's consistent enough to hit a certain number of consecutive misfires. I learned that the hard way - I have an ongoing issue with cyl 5 misfire where the injector is not firing fuel into the cylinder, intermittently so it comes and goes. No issue with the injector, coil, or plugs as all were swapped with another cyl to verify. They replaced the PCM and it didn't fix it. So they replaced the main wiring harness yesterday and it's gone...but I won't consider it resolved for a couple weeks of smooth running since it has gone and come back after them doing some work.

 

[kapinallinen2]

You can with the correct software. I think Tazer or jscan can do this. I know some people have done this. I want to but I got AlfaOBD and you can't with Alfa.

Yeah, I got alfa also.

 

[kapinallinen2]

That doesn't sound like rough idle, that sounds like a misfire. The PCM won't throw a code unless it's consistent enough to hit a certain number of consecutive misfires. I learned that the hard way - I have an ongoing issue with cyl 5 misfire where the injector is not firing fuel into the cylinder, intermittently so it comes and goes. No issue with the injector, coil, or plugs as all were swapped with another cyl to verify. They replaced the PCM and it didn't fix it. So they replaced the main wiring harness yesterday and it's gone...but I won't consider it resolved for a couple weeks of smooth running since it has gone and come back after them doing some work.

Had cylinder 4 misfire due to questionable fuel quality.
Ran Lucas injector cleaner and Sta-bil, took two tanks full but good to go for now.