Cummins ISX12 CM2250 (2010-12) Fault Code: 1659 PID: SPN: 1328 FMI: 31 Engine Misfire Cylinder 6- Condition Exists - EcuForce Truck (2024)

FAQs

How to fix cylinder misfire? ›

SPN 521049/FMI 31

Description This Code Sets When There is a Code Present for the Diesel Exhaust Fluid (DEF) Tank Level, DEF Dosing Unit, DEF Pump, NOx Sensors, Blocked DEF Line, DEF Quality, NOx Efficiency, Selective Catalyst Reduction (SCR) Harness and/or SCR Sensor.

Can I drive with a P0306 code? No! If your vehicle's PCM logs code P0306, you must stop driving quickly.

How much does it cost to fix an engine misfire? Depending on the misfire's cause, the repair and replacement cost might range between $100 and $1,000.

SPN#1325, FMI#31 ― Engine Misfire Cylinder 3 -- Condition Exists.

The most common causes of misfires are worn, improperly installed, and mishandled spark plugs, malfunctioning ignition coils, carbon tracking, faulty spark plug wires and vacuum leaks.

When an engine misfires, it means that the timing is off and the combustions are not happening at the right time. This can cause serious damage to the engine, as well as decreased fuel efficiency and increased emissions. In some cases, a misfiring engine can even cause the car to stall.

SPN stands for Suspected Parameter Number which tells you the circuit where the fault occurred. For example, if you had a SPN 1791 code, it would point to a fault detected in the EGR Valve Control Circuit. FMI stands for Failure Mode Indicator which tells you the reason the fault code was set.

This fault code indicates that the nox emissions are not being reduced enough by the SCR catalyst.

A Suspect Parameter Number (SPN) is a specific code used in the automotive industry to identify and diagnose faults codes in electronic control units (ECUs) within vehicles.

What happens if I keep driving with a cylinder misfire? ›

The longer you ignore the problem and drive the vehicle in spite of the misfire, the more likely it is that your engine will suffer serious damage. A misfire on its own does not usually signal a serious mechanical problem. Very often, it is just a spark plug, ignition coil or a fuel injector that needs to be replaced.

How long can you drive with bad spark plugs? Ideally, you should replace them immediately.

Can a misfire fix itself? Any engine misfire is serious and a misfire will not resolve itself in most cases. There are numerous causes for engine misfires some of which are simple and low cost to fix.

Usually, fixing a misfire is a pretty straightforward repair. However, there could be a deeper issue causing it, so it's always a good idea to have a professional mechanic look under your hood.

Worn or fouled spark plugs are one of the most common causes of engine misfires. These small but crucial components deliver the spark that ignites the fuel in your engine. If they're not working properly, your engine won't be firing on all cylinders.

A misfire will cause the engine to momentarily stumble, or lose rpms, and then regain its normal engine speed. The misfire will usually reappear, either under specific operating conditions or randomly. A misfire may occur when your engine is idling, causing a rough or uneven idle.

SPN 1322 FMI 31 - Misfire - Multiple Cylinders

Fault sets when Engine Control Module (ECM) determines there is a balance difference between cylinders. Malfunction Indicator Lamp (MIL) will illuminate when this fault is detected during two consecutive drive cycles.

SPN#1326, FMI#31 ― Engine Misfire Cylinder 4 -- Condition Exists -- Continued.

SPN#1324, FMI#31 ― Engine Misfire Cylinder 2 -- Condition Exists -- Continued. 10) and run at idle. 6. Loud engine knock occurs.

Aside from these more immediate threats, misfiring cylinders can also lead to significant engine damage. Misfires don't simply go away - they need to be addressed immediately. Even if they don't get worse, they certainly won't get any better unless you take the car to a mechanic.

Is it OK to drive with a misfiring cylinder? ›

The longer you wait to fix your engine misfire, the more risk you run of causing more serious and long-term damage. If you experience any of these sounds, have a mechanic inspect the engine as soon as possible. So, the answer to Is It Safe to Drive With A Misfiring Engine? An emphatic NO!

Engine misfires are caused by many things, including: Dirty, broken or worn-out spark plugs. Low oil pressure (injector clogging) and/or overheating issues.

Ignition system components, including spark plugs, plug wires, ignition coils and ignition timing are culprits as are lean air/fuel mixtures and mechanical issues within the engine. Worn piston rings, worn or broken valves and worn cylinder walls, as well as worn cam lobes can also contribute to the problem.