Cylinder 1 misfiring. Which one is number 1? - 2004 Volvo S40

Did you change the spark plugs and correctly gap them?

Swap the coil and plug from cylinder 4 to cylinder 1 and see if the misfire moves to 1.

If it does move, then the coil or spark plug is bad. Then you can swap the coil from cylinder 1 to cylinder 2 and if the misfire moves, you know it is the coil.

https://www.google.com/search?q=2017+Kia+Sorento+2.4.+Misfire+on+cylinder+number+4

..

Miss-fire on cylinder number 1. The picture shows location of cylinder number 1. Check for spark at number 1 cylinder. There are ignition based misfires--fuel based misfires--emission based misfires, I'm sure I'm leaving something out. You need to be aware the computer may disable the fuel injector if misfire detected on that cylinder, that's normal. Trying to protect the cat. If fuel injector is disabled have to decide if normal operation or something wrong with fuel injector or wiring circuit.

Standing on the passenger side.looking at the engine. Number 1 is the first cylinder on your left. Follow the wire to the coil. unplug it at the coil, lay the end of the plug close to the tip of the cap and start the engine. If there isn't multiple sparks, replace the coil. If there is , replace the plug and or wire. If you still have a misfire after that, do a compression test on number 1 cylinder.

You could have a bad spark plug or a bad coil pack for cylinder 1. Or it could be as simple as a poor connection at the coil pack.
Other possibilities are, bad injector or poor compression.

this usually indicates a cylinder misfire. Two things you can do.

1. remove the coils or wires one at a time until you find the cylinder that is not working. Than inspect the components on the cylinder (plug, wire, coil, etc)

2. scan the computer for codes. You should get a P030X (the X will be a number 1-6 depending on what engine you have). whatever number is shown is the cylinder that is misfiring. for example P0304 would be a number four cylinder misfire, P0302 would be a number two cylinder misfire.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

P0300 - Random / Multiple Cylinder Misfire Detected

Possible Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plugs
- Replaced Injectors
- Replaced Ignition Coils

P0301- Cylinder Number 1 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Most likely your issue is with cylinder number 1. Follow the info I have provided and you should be able to solve this issue.

I wouldn't worry about the 02 code it will clear when you replace the coils. to be positive that the coils are bad, swap them with another cylinder and see if that cylinder misfires. 90% of the time it's the coil. Let me know
Randy

The error code p0301 ,This code is related to misfire.The cylinder is misfiring. p0301 this is the indication of cylinder number 1 ,that is misfiring.If the code comes up as p0300 this is the indication of random misfire from all the cylinders.But in your case its indicating p0301 this is indication of cylinder 1 misfire.Check cylinder 1 and replace the faulty cylinder 1 to clear the fault.The spark plugs and the wires connecting to spark plugs also needs to be checked. Keep updated with any more query.Thanks.

first code means random/multiple misfire cylinder (s) detected
second code means misfire detected number 1 cylinder, third code, miss=fire number 3 cylinder fourth code misfire number 4 cylinder
causes can be spark plugs, HT leads, ignition coils, injector, wiring fault, low compression/ engine mechanical fault

Generic code is Cylinder 1 misfire