How to Deal with Irregular Misfires in Honda's 1-2-3-4 Cylinders When Accelerating?

[DiStephanie]

Honda's irregular misfires in cylinders 1-2-3-4 when accelerating can be caused by the following reasons and solutions: 1. The causes of engine misfires include clogged or damaged spark plugs, faulty cylinder wires, problematic ignition coils, or issues with fuel injectors such as clogging or low voltage. Problems with the air-fuel mixture or cylinder pressure can also lead to engine misfires. 2. If you encounter engine misfires, you can shift to neutral, engage the handbrake, and forcefully press the accelerator to ensure the engine speed exceeds 4000 RPM, maintaining this for 1 to 2 minutes. Generally, if the blockage is not too severe, the issue can be alleviated.

[SanZoe]

I encountered a similar situation last month with that old Accord - it would shake like having asthma during acceleration. First checked the spark plugs and found one electrode nearly burnt out. Replacing all four spark plugs showed significant improvement. But the problem returned after two days, with the scanner showing misfire in cylinder 3. The veteran mechanic suggested checking the ignition coils, and we found two coil rubber boots cracked and leaking oil (which causes high-voltage leakage). After replacing the coils didn't solve it, we finally discovered the fuel injector was half-clogged by low-quality gasoline. My advice: don't rush into major repairs - first use a diagnostic tool to identify which cylinder is misfiring for targeted troubleshooting, saving unnecessary costs. Remember to add a bottle of quality fuel system cleaner to your tank - Honda engines can be quite particular about fuel quality.

[DeRuby]

After repairing Hondas for ten years, I've found that 80% of misfire issues stem from the electrical system. I once encountered a case where the owner reported random misfires across four cylinders, which turned out to be caused by aging spark plug wires with unstable resistance. Don't rush to disassemble the engine—follow these steps to save time and money: First, check if the spark plugs are carbon-fouled or have excessive gap (factory specification is 0.8mm). Second, use a multimeter to measure the secondary coil resistance of the ignition coil (normal range: 6-12kΩ). Third, unplug the fuel injector connector and listen for crisp operating sounds. Fourth, perform a cylinder compression test—if below 10bar, consider valve issues. Last week, a Civic was misdiagnosed due to unstable crankshaft position sensor signals, which is easily overlooked.

[MacRichard]

My friend's Honda CR-V had the same issue last year, where the car body would jerk and shudder when pressing the accelerator harder. I accompanied him to the repair shop and followed the whole process. The mechanic first plugged the computer into the OBD port, and the screen showed intermittent misfires in cylinder 2. Upon disassembly, they found a loose ignition coil connector, but securing it with a zip tie made things worse. Later, while checking the wiring, they discovered that the wiring harness near the firewall had been chewed by mice, exposing the wires, which caused a short circuit during rainy days and led to signal confusion. I suggest you also focus on checking the engine wiring harness, especially near the exhaust manifold, as high temperatures can cause the wires to age and expose the insulation. Also, remember to have the mechanic check for carbon buildup in the throttle body, as dirt can affect the air intake in each cylinder.