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Misfire on fiat punto and not the coil PAC?

If you've determined that the coil pack is not the cause of the misfire in your Fiat Punto, here are a few other potential causes to check:

Spark Plugs: Faulty or worn-out spark plugs can cause misfires. Check the condition of the spark plugs and replace them if necessary.

Fuel Injectors: Clogged or malfunctioning fuel injectors can prevent the proper amount of fuel from being delivered to the engine, leading to misfires. Have the fuel injectors inspected and cleaned or replaced if needed.

Fuel Filter: A clogged fuel filter can restrict the flow of fuel to the engine, causing misfires. Check the fuel filter and replace it if it's dirty or clogged.

Air Filter: A dirty or clogged air filter can restrict airflow to the engine, leading to misfires. Check the air filter and replace it if necessary.

Compression: Low compression in one or more cylinders can cause misfires. Have the engine compression tested to identify any cylinders with low compression.

Timing Belt: If the timing belt is misaligned or worn out, it can affect the timing of the engine, causing misfires. Check the condition of the timing belt and replace it if necessary.

Sensors: Various sensors, such as the oxygen sensor, crankshaft position sensor, and camshaft position sensor, provide important information to the engine control unit (ECU) for proper engine operation. Malfunctioning sensors can lead to misfires. Have the sensors checked and replaced if necessary.

Computer (ECU): In some cases, a faulty engine control unit (ECU) can cause misfires. Diagnosing and fixing ECU issues may require specialized knowledge and equipment.

It's recommended to have the vehicle inspected by a qualified mechanic or automotive technician to accurately identify the cause of the misfire and perform the necessary repairs.