Technical Multiple misfires, stalling & unsure what it is?

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Technical Multiple misfires, stalling & unsure what it is?

Sean0402

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May 8, 2025
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London
Hey everyone,

I recently got a 500x 1.4 Multiair.

The car came with a few issues to start with. I have plugged my scanner in and receive the dreaded P0300. Multiple misfires on cylinders.

The car does stall & is extremely rough on idle. I did rev it a tiny bit one time and heard a loud noise from the exhaust & have not turned it on since as I need to try to solve this.

I seem to get similar error codes each time I delete them and start the engine up again for about 20-30 seconds.

P0300 & P130-A always stays though.

Fault codes which randomly occur are:
P0301
P0302
P0303
P0304

Understandable this will be true as it is unsure which cylinder it is.

So far I have replaced the following(Tired to keep as close to OEM as possible. Some are OEM, some are not.):
Battery
Coil Packs
Spark plugs,
Knock sensor (This made it run a tad smoother once replaced.)
MAP sensor


I currently have the injectors out and tested the resistance. Each are reading between 14.5 and 15. To my understanding, this is within tolerance. I have not been able to test the injector spray pattern as I do not have a machine.

I have also tested the wiring, everything is absolutely fine on that part. Voltage + resistance is all okay.

I am a bit stuck on where to look from here. Any advice would be greatly appreciated!
 
Model
500x 1.4 multiair
Year
2016
Mileage
79000
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