Note that a check engine light could be potentially caused by a number of things, not just a spark plug problem. Attach the spark tester to the distributor end of the coil wire. Hence be sure to check the wires the next time you open the bonnet. That let it crank a little faster when starting. But what I did find was the engine would run on just the left cylinder but not just the right. When to change your spark plugs. YourMechanic. Fortunately, there are some symptoms you can watch for to help diagnose faulty spark plugs. You don't want resistor plugs because these cars wires have resistor built into the end of the wires that connects to the spark plug. Re: Spark Plug Bad Symptoms I was going to say that there are only two kinds of sparkplugs in most of the Hondas, ones that are bad, and ones that will soon be bad. So your six cylinder engine would then be running on only five cylinders. They say that platinum plugs have a lower intensity spark, however I used them with no bad result. Disconnect the spark plug from the spark plug lead; Connect your spark plug lead with your spark plug tester; Connect the spark plug to the spark plug tester and create a link from the spark plug to the lead. Top 6 Bad Spark Plug Symptoms. Bad Spark Plug Symptoms Common signs of spark plug issues include: rough idling, poor acceleration, reduced fuel economy, misfiring, hard starting, and even the dreaded check engine light. The large variance in issues that can be caused by faulty spark plugs just goes to show how critical these parts are to your engine. The most common symptom of bad spark plugs is engine's starting troubles. Sometimes a good spark plug will just go bad. It is very much possible that even though the spark plugs look first-rate, there could be a damage in the spark plug wires. Ensure that the number two spark plug wire goes to the number two cylinder and so on. Since you changed the plugs, it is possible that you got them mixed up. If you suspect that you have a bad spark plug, it’s important to get your vehicle examined by a professional before driving it much more. Assuming you are on the stock ECU, your spark plug wires should be set up according to the left diagram. When failing spark plugs don’t produce enough hot sparks to ignite the fuel mixture, it’s a sign of worn spark plugs, thus reduced effectivity.. Spark Plug Wires are also known as the ignition cables. Expect to spend about $50 for a set of plug wires… Bad spark plug symptoms may be subtle, or incredibly noticeable. Since bad spark plugs can lead to misfires (one of the symptoms), many of the general red flags overlap. Bad spark plugs can cause many problems with your Honda Accord. The number of times this occurs is largely dependent on the gravity of the misfire. Signs & Symptoms of Bad Spark Plug Wires. However, the cause of slow acceleration can be a sign of the ignition system. Bad spark plugs can cause many problems with your Buick Regal. The most common symptom of bad spark plug wires is a rough engine idle. Results. Confirm if the wires to your spark plug … Jan 12th 2016 at 3:53PM. The reason of this problem may be that the spark plug fails to produce the spark. Rough Engine Idle. and helped a little. The Most Common Symptoms of Bad Spark Plugs Starting Trouble. The engine has trouble starting. If you’ve driven at your desired speed, whether that be 100mph or 60, you would be quick to assess the change. Shawn beat me to it in a more technical way. Fire requires three components: oxygen (O2), fuel, and heat.In your engine, every time a cylinder pulls an intake stroke, it pulls in air (≈21% O2).Port-injection engines inject fuel during the intake stroke, while direct-injection engines, gasoline or diesel, might wait until the compression stroke. 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