Go BottomHonda H6522 diesel misfiring
 | yodamon
Join Date: Feb 2009 Posts: 5 Jacksonville, Florida USA 
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2024-03-28 201810
I have a Honda H6522 with a 3-cylinder diesel. It starts every time regardless of the temperature. Then after running for about 5 minutes, it starts to misfire. It sounds like it's only firing on 2 of the 3 cylinders. It rattles and shakes for anywhere from 3 to 5 minutes. Sometimes it stalls. When this happens, I just let it sit for a few hours. When I come back it starts, then runs rough just for a few seconds then runs smooth again. After that it runs well all day. I've cleaned the fuel filters and fuel is being pumped OK. If anyone has experienced this, please let me know what might cause this.
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| gagaid99
Join Date: Jan 2013 Posts: 4 WV
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2024-04-09 201811
It sounds like you've already done some troubleshooting with the fuel system, which is a good start. Since the engine runs smoothly after sitting for a few hours, it could be related to heat affecting certain components. Here are a few potential causes to consider:
Ignition System: Check the spark plugs, ignition coils, and ignition timing. If there's an issue with ignition, it could cause misfiring under certain conditions like heat buildup.
Cooling System: Ensure that the cooling system is functioning properly. Overheating can lead to engine misfires and rough running.
Compression: Perform a compression test on all cylinders to check for any compression issues. Low compression can cause misfiring and rough running.
Fuel Injectors: Even though you've cleaned the fuel filters, it's worth checking the fuel injectors for clogs or malfunctions that could affect fuel delivery to one of the cylinders.
Engine Sensors: Faulty sensors such as the crankshaft position sensor or engine temperature sensor could cause issues with fuel delivery or ignition timing, leading to misfires.
Exhaust System: Check for any exhaust leaks or restrictions that could affect engine performance, especially when the engine is hot.
Considering the symptoms you've described, it's likely a problem related to heat affecting a specific component or system. If you're not comfortable diagnosing these issues yourself, consulting with a mechanic or a Honda specialist would be a good next step. They can perform more detailed diagnostics and pinpoint the exact cause of the misfire.
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