Engine runs rough after warm up. When cold, the engine easily fires right up.

Engine runs rough after warm up. When cold, the engine easily fires right up.

Engine runs rough after warm up. When cold, the engine easily fires right up. Cleaning carburetor, spark plug, gas, flywheel key and mag spacing wouldn't have anything to do with the engine temperature. Jul 5, 2024 · With a clear understanding of the underlying causes, it’s time to explore targeted solutions and expert recommendations to resolve the rough idle issue after engine heat up. You need to look for something temperature related. I don't get a temp light, and the engine seems to run at normal temp, although I don't have a temp gauge at this time. Again, when I start and the car is cold It runs fine. After about a half hour, the engine starts to idle roughly and sometimes stalls. Feb 20, 2025 · A car might run rough until warmed up due to a faulty temperature sensor, poor fuel mixture, or issues with the ignition system. Here's how to troubleshoot a rough idling car Aug 18, 2023 · Why does my engine idle roughly but show no check engine light when warm? Some issues like minor vacuum leaks, dirty throttle bodies, or weak ignition coils can degrade performance without immediately triggering a diagnostic trouble code (DTC). . I have a 99 silverado, 5. After warm-up, however, it runs rough and barely idles, sometimes stalling. Nov 20, 2017 · I will do the test tomorrow and since my problem starts after the car is warmed up, I do the test when the car is warm as well. After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. Apr 22, 2025 · My 454 TBI starts and idles low, but after about 2 minutes (once it warms up), it starts backfiring through the air filter and won’t take throttle. Plugs (gapped), distributor cap, rotor, exhaust manifold gasket are all new. Runs great when engine is cold. Nov 21, 2015 · As a rule when a engine starts to run rough after it warms up the first thing I look for is a tight valve. I checked and adjusted all the valves. Aug 26, 2018 · Once warmed up, the car idles really rough in gear (Drive), RPM really starts to fluctuate between 500 and 700, the car kinda shakes, and the engine is likely to stall if I leave it in gear (and with car not moving) for much longer. Sep 23, 2010 · Engine runs rough after warm up Jump to Latest 20K views 11 replies 8 participants last post by pman Sep 13, 2014 1 Jul 16, 2008 · I set the timing on the cold engine and it ran very smooth. Here’s what I’ve done trying to fix it: Mar 17, 2025 · While it's often simple to fix a rough idle, finding the cause is usually anything but simple. When the engine reaches its operating temperature, these problems may become less noticeable as the engine compensates for the issues. It runs, sounds, and idles great for about a half hour under normal driving conditions. I replaced the 02 sensors because I am well over 100k miles. If I let the truck sit and cool off, it runs well again until it warms up. While it may seem like a minor inconvenience, a rough idle often indicates underlying problems that, if left unchecked, could lead to more significant engine damage. For some reason, the rich mixture keeps being rich, and a warmed engine can’t burn it efficiently, causing your car to lose power, idle rough, hesitate during acceleration, or even stall. Another thing that effects a warm engine running rough is a coil going bad. I ran the codes, had low voltage x4 oxygen sensors, and random misfires. 3 liter 4x4 137k miles. Aug 7, 2020 · A rough idle when the engine is warm can be a frustrating issue for vehicle owners. Jul 27, 2009 · Here is my issue. zfkfa gmg jejfn zxcqmkd vkytbg paiqra nzodh mvyjidgjp vgaocr pytjxe