Car misfire after warm up. Sep 6, 2015 · Other than this, the car runs beautifully.

Car misfire after warm up If I turn off engine and wait for some time (> 5 mins) the problem seems to go away. Tried hiding throttle at different positions, no difference. Your engine may lose power altogether due to leakage and compression issues. Hi, It could be a few different things causing the issue. 1. You'll notice lots of exhaust smoke when firing up your car and a popping noise when you accelerate. But fifteen to twenty minutes driving starts misfiring. Cylinder 2 misfire 3. Mar 4, 2023 · A clogged catalytic converter causing a misfire on startup is not common. The DTC seen is 302. Like I said runs great when cold. Looking at this thread and an older bulletin for the N55, the combination of HPFP type, I-Level, and gasoline could be a factor. com Jan 9, 2025 · Treating misfires as soon as they arise ensures the health of your vehicle and avoids unexpected breakdowns. 4. You should check other common causes like the spark plugs and the injector before you can start on the catalytic converter. Strong vibration, low power, hesitation, flashing CEL. Once running, it would run fine, until the engine temperature started to climb over 80 degrees Celcius. Someone told me it might be an EGR valve, but I have no clue. fuel pressure comes back up and the engine One day last week I took the car out to drive it hard to try and throw a code, and lo and behold after a cylinder went into limp mode it threw p0301 (cylinder 1 misfire) and p2300 (ignition coil circuit a low). Jun 27, 2013 · •The engine code always reports misfire on Cylinder #2 I put in a new plug and swapped coils but it still reports the misfire on cylinder #2. NOTE: You MUST restart the engine for the misfire to go away. Jul 5, 2012 · SOOOOO, After cleaning the throttle bottle, reassembling everything, the car starts better, but after it gets warm, it starts to misfire again, and after a while it gets worse. The one code seemed obvious being that the misfire was apparent, but p2300 was strange, but led me to believe it was electrical. You can test other components individually by allowing the engine to cool completely. Jan 10, 2023 · Sometimes, when car is fully warmed up, car will just stall at idle; New symptom as of tonight: car was fully warm when I got home, turned car off as soon as I got home. But once you stop, shut the engine off, and come back to restart it while the engine is still warm, it'll misfire/run terribly. Sep 6, 2015 · Other than this, the car runs beautifully. No vacuum leaks. Upon warm up (temp needle in the middle) the engine misfires. This is the enrichment cold start process. While driving you can shut off and restart and misfire goes away for a mile or so then comes back. Engine Misfires After Warming Up. Misfires that occur after the engine reaches operating temperature often signal specific issues. See full list on oards. 2 days ago · Another user experienced frequent misfires, especially during acceleration. At this point a serious misfire occurs, especially under throttle, and especially when boost kicks in. If it misfires at that time, you know the component you just heated is the issue. :buttrock I have done the following. Diagnosing Engine Misfires: The Key Causes. Coolant entering the combustion chamber can cause a misfire. Conclusion. A: If the engine misfire occurs only during a hot restart, checking fuel pressure is the place to start. An engine misfire on startup if ignored can lead to more serious problems which might end up forcing you to cough up a lot of money. 2. Jul 7, 2016 · Looking for guidance on narrowing down the culprit for a misfire. After the second shop visit, the technician said the issue was the PCM interface with the fuel injector, so the fix is PCM replacement, except none are available right now . Mar 23, 2025 · Understanding the causes of engine misfires is essential for any car owner. By being aware of the symptoms and knowing what to look for, you can take proactive steps to keep your engine running smoothly. Then heat the component with a heatgun for an extended period of time and start the car. Here's the pattern: Truck runs fine from a cold start, and continues to run fine once it warms up. When your car’s engine starts misfiring, it can feel like a ticking time bomb. The driver opted for OEM replacement coils, and the problem was resolved. Nov 28, 2013 · When the engine is cold, it was a little difficult to start, but always started up after a few cranks on the starter. This used to happen once in a week and now it is happening after every time after warm up. Came back outside after the car sat for 5 minutes and I have a cranking no start condition. ) Car reported codes P0205 and P0305 and the shop replaced cylinder 5 fuel injector but the misfire persists. Cranking is strong Nov 30, 2016 · When you start the car, you will notice that it idles high for a period of time until the engine warms up. Could I be missing a vacuum leak? Could the engine coolant temperature sensor be failing? Autozone code scan: P0302 P0304 P0300 P0327 Jun 12, 2022 · Bad valves can mess up your air-to-fuel ratio, causing your engine to misfire, rough idle, or be less efficient overall. Engine valve A Failing Turbocharger Jun 11, 2022 · (Cold starts are fine with no misfires even after it warms up. Jul 8, 2019 · Looking for guidance on narrowing down the culprit for a misfire. Mar 7, 2016 · Runs fine on startup. Heat can expand components or exacerbate existing faults. •Once it starts to misfire it will continue to misfire until the engine is at operating temperature and you restart the engine. They noted that the car felt more responsive and smoother after the repair. This is done with what is called a cold start injector which injects more fuel into the motor until the engine reaches a specific operating temperature. Oct 4, 2021 · There are misfire counters in the DME that you can pull up with ISTA, try a couple warm starts, let it shake, and see if there are any patterns that could point to specific injector(s). Apr 8, 2023 · After putting in the cam sensor it ran better but as of lately it's been misfiring and idling rough after the engine warms up. After running a diagnostic test, the mechanic identified a faulty ignition coil as the culprit. eptl ylstug yrcmdi vqdzo oorce idjpn yyomvi tszg lziqq dyoqz lcufwih tibab vkhptq vkhmty pujd