Bad ignition coil reddit. Jan 8, 2026 · A faulty ignition coil can spell trouble for ...

Bad ignition coil reddit. Jan 8, 2026 · A faulty ignition coil can spell trouble for your car. After changing plugs and wires I'm still feeling a small misfire at idle. Nov 17, 2025 · A bad ignition coil can cause a wide range of problems, from hard starting and engine misfires to loss of power and poor fuel economy — and because its symptoms often overlap with spark plug or fuel injector issues, it’s important to understand exactly how to identify it. Worsening Gas Mileage. We will also show you the location and explain how to test the coils. If a spark plug is not getting the right voltage to create a spark, you may experience a hard start. With most modern vehicles, a faulty ignition coil is enough to turn on the Check Engine Light. This means that you may have a coil that goes bad over time. The labor time to replace 4 coils is like 1 hour, maybe 1. 4 banger. Get an oem or high quality coil only fix the one that is bad. I had then replaced with my spark plugs not long ago but I bought the parts from autozone in a pinch because my car broke down and I needed it for work. Just wondering if I'm missing on anything like additional gas mileage by not just replacing them all. . Plus probably 2 hours diagnostic? Lets take worst case: $1200 - (Parts 200$ x4 = $800) = 400$ for labor & tax 400$ Labor & Diagnostic over 3. CAMRY** What's the tell tell signs of a bad coil pack or sparks plugs? It would be in relation to a Toyota carry 4 door car. Replace ignition coils as needed or all at once? My 2008 scion tC with 115k miles engine is misfiring. Ignition coil bad? So I just got back from the mechanic after an ongoing problem with my car. Ignition coils can either fail completely or fail intermittently. I swapped the ignition coils on cylinder 1 and cylinder 4, and then cylinder 4 started misfiring. What do bad spark plugs and bad ignition coils physically look like? I tried searching online but all that kept popping up was symptoms of bad plugs and coils, I already know I have a bad plug and coil but I wanted to know what physical characteristics they had when they are bad. If electrical resistance in the secondary ignition circuit is too high the coil must generate a higher voltage to fire the plug. Here are 8 signs of a bad ignition coil along with its average replacement cost. Engine misfires, rough idle, and loss of power One of the most common symptoms associated with a faulty ignition coil is engine performance issues. If an ignition coil is not working properly, your engine will likely misfire. Illuminated Check Engine Light. He said it feels like one of my ignition coils isn’t too happy. First (from the guidelines on the sidebar), what year/make/model? Coil packs, replace all or just the bad one? So I've replaced only one in my car which takes 6 coils. Archived post. I swapped out the ignition coil with an adjacent coil and misfire followed to the new cylinder indicating a likely bad coil. 5 hours means a shop rate of around $114 - $115 an hour. Low fuel pressure / inadequate fuel flow, bad spark plugs/wires/etc, or something else altogether. Pull the plug while you are there as well make sure it’s good. But when I turned the car engine on and proceeded to pull each ignition coil one at a time, every one the coils including what I thought was a bad coil caused the engine to respond. Nov 11, 2025 · In this guide, we cover the symptoms of a bad ignition coil and discuss how this part functions. Generally a good quality coil is cheap. 3, round coils. Finally, you get some answers to questions you may be afraid to ask. A misfiring engine results in a jerking or sputtering feel when you are moving at normal speeds. So it's likely that the single ignition coil is bad. I've ordered 4 Bosch ignition coils but it'll take another 3 days to arrive. It started having problems almost immediately after the 7 day return period was up (actually, the first problem was right when they had towed my car to my house, the key fob had a dead battery and none of the buttons worked and that was the only way of starting up the car since its keyless), starting with the ignition coils which somehow just Well what you're experiencing could be a symptom of a bad coil (or coil pack), but it could also be one of a number of other problems. Sep 4, 2024 · Make sure your battery is fully charged and in good condition, and try again with the Hitachi coils; if that doesn't work, replace the Hitachi coils with the coils you removed and try again. Someone else can chime in if the ignition coil driver is embedded in the PCM or not. First - a few questions. This guide covers the symptoms of a bad ignition coil, common causes, and step-by-step diagnostics to fix it yourself—potentially saving you $200-$800 on unnecessary shop visits. Hard Starts. Accordingly, even if your vehicle seems to be performing normally, you should watch for worsening gas mileage. 5 hours. If you have an OBD-II diagnostic scanner, you may see a P0351 ignition code. Question is, can I drive short distances to groceries and stuff before they arrive? Simple way to test ignition coils? '02 Tahoe, 5. Is there a simple way to test my coils, preferably without removing them? I'm guessing a DMM can't do it. Mechanic diagnosed that it needs new spark plugs and a coil. To run, your vehicle's engine needs a spark at the right time. New comments cannot be posted and votes cannot be cast. Jan 8, 2016 · Usually a faulty ignition coil will produce a few symptoms that alert the driver of a potential issue. Misfiring Engine. How likely is it that the other coils will malfunction within a year or so (planning for a new car after that)? We would like to show you a description here but the site won’t allow us. 1. I have a lot of come backs from installing aftermarket coils. Do they usually just either work, until they don't or do they degrade in effectiveness over time? (1) Yes, a bad spark plug, incorrect type of spark plug, or a wide spark plug gap can cause a coil to fail. yosxyo oneqh jbtfsjv gbzgr tqwdz ugaqww ovvsed dhfkfs txv mbklseph