Cars idle roughly after warming up
10 posts in the last 90 days, all from r/MechanicAdvice.
“I’m trying to diagnose a new issue with my 2008 Saturn Astra About 3 days ago, the car started developing a slightly rough/erratic idle, but only intermittently after the engine warmed up. I noticed it more often after accelerating hard on the highway and then coming to a stop…”
“I have a 2017 bmw 440i with a gen 1 B58 and pretty much every time i start it (warm or cold), before it drops to the final idle position around 650rpm it shakes. I can only post a picture, but in the frame you see at the end of the graph where the rpm goes up and down rapidly…”
“207 1,4L petrol engine, issue When my engine is warm and i start it up, it idles very roughly, but if i rev it slightly 1 time, it idles fine again. Also happens when coming to a complete stop. Common issue? Timingchain changed, sparkplugs, oil etc. Ant tips would be grately…”
Several owners report their cars, including a Peugeot 2008 and an Audi A3, experience rough idling when the engine is warm. The issue often resolves with slight acceleration or revving. This suggests a potential problem with ignition timing or related sensors.
SOURCES (10)
“I’m trying to diagnose a new issue with my 2008 Saturn Astra About 3 days ago, the car started developing a slightly rough/erratic idle, but only intermittently after the engine warmed up. I noticed it more often after accelerating hard on the highway and then…”
“I have a 2017 bmw 440i with a gen 1 B58 and pretty much every time i start it (warm or cold), before it drops to the final idle position around 650rpm it shakes. I can only post a picture, but in the frame you see at the end of the graph where the rpm goes up and down rapidly, and it shakes the car. The car has no issues driving normally or under load otherwise. I’ve searched everywhere and watched all sorts of idling issue videos and asked chatgpt but nobody seems to have this problem i have, s”
“Hi guys, I have a Skoda Octavia 1.5 petrol manual mk4 2021 Can you please tell me if the engine noise and shaking is normal as I can feel vibrations through my seat and cabin in general sometimes when at idle but thrn it disappears for weeks to come showing once more Thank you submitted by /u/Last-Independent884 [link] [comments]”
“Hey everyone, I recently bought a 2014 Audi A3 (2.0 TDI EA288/CRLB, Manual, ~199k km). I taped my phone under the hood to record this because I thought the cold starts were loud. Does this seem like a normal amount of movement for a cold start or could I have a bad engine mount? The seller provided documentation that the clutch along with the DMF were replaced last year. I also took the acoustic engine cover off and noticed there is some heat or friction damage on the rubber fuel and coolant hos”
“I’m looking at a BMW from an auction. It’s super clean except for smoke from the exhaust and rough idle. It starts and idles perfectly normally. If I rev it, when the RPM comes back down the idle almost dies/stumbles for a few seconds, then recovers. There is smoke that smells like oil coming from the exhaust, seemingly more noticeable from the driver-side outlet. I heard a high-pitched noise from underneath the car. submitted by /u/ElectionBeginning424 [link] [comments]”
“Reposted because the wording was completely wrong. Car is a 2006 Audi A3 8P Shown is a video of the car in neutral with the clutch engaged and accelerator pressed. submitted by /u/tehcmc [link] [comments]”
“When my AC is on the rpms are ~800 but when i turn it off they drop down to ~600 or even lower. What could it be? The engine is a 1.6 16v 105hp. submitted by /u/criccobricco [link] [comments]”
“207 1,4L petrol engine, issue When my engine is warm and i start it up, it idles very roughly, but if i rev it slightly 1 time, it idles fine again. Also happens when coming to a complete stop. Common issue? Timingchain changed, sparkplugs, oil etc. Ant tips would be grately appreciated! submitted by /u/Bonnabuug [link] [comments]”