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Misfire in Cylinder 4 with code P0304
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Thread: Misfire in Cylinder 4 with code P0304

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    Misfire in Cylinder 4 with code P0304

    My sister has a ‘13 Pop that has 79K on the clock and she started experiencing a rough idle upon start up and throughout the duration of the engine. CEL code P0304 pops up due to a misfire in cylinder 4. My first measure of action was to replace the spark plugs, and which I did on all four cylinders. When i was pulling the plug for cylinder 4, the plug was covered in oil and some oil on the plug in cylinder 3. My next action would’ve been replacing either the coil pack or spark plug wires but the oil in the cylinder kinda deterred me from thinking that would solve the problem.

    after replacing the all 4 spark plugs, i cleared the codes and cranked the engine over and the startup was a little smoother than before but the misfire remains and the code reappears.

    she took the car to a shop and they tested the compression in the cylinder and it either read no/low compression (i forgot which). now my issues point to either the valves or the head gasket might be blown. any advice?

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    After having this happen to me; probably a burned an exhaust valve. You really have two choices:

    1. Replace the cylinder head assembly. Surprisingly the entire assembly isn't too expensive, about $400. It's the shop labor cost that is a killer: (about $2,100 if you supply the parts). While in there, may as well replace the water pump, thermostat, timing belt, and timing belt tensioner pulley too. These miscellaneous service parts will cost around $225.

    2. Replace the entire engine with a low mileage, used one. Just make sure it came from a rear-end wrecked car. Cost of engine; between $750 and $1500. Labor would run you between $750 and $1,000.

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    Crap... this is the same EXACT issue I’m dealing with.

    OP, what did you end up doing? Or what was the fix?

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    Quote Originally Posted by newsoltsc View Post
    Crap... this is the same EXACT issue I’m dealing with.

    OP, what did you end up doing? Or what was the fix?
    As with many "junior" posters, they never answered back. That usually means the news wasn't good.

    I would start with having a mechanic do a cylinder leak-down test on the mis-firing cylinder. That test will tell you whether you have a burned-valve. Keep in mind that if the mechanic recommends replacing the burned valve just in that cylinder, you probably have another cylinder about to suffer the same fate down the road. As I mentioned in my reply, it's best to just replace the entire cylinder head. That way you get all new valves and a new head less likely to burn valves.

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    Quote Originally Posted by KellyfromVA View Post
    As with many "junior" posters, they never answered back. That usually means the news wasn't good.

    I would start with having a mechanic do a cylinder leak-down test on the mis-firing cylinder. That test will tell you whether you have a burned-valve. Keep in mind that if the mechanic recommends replacing the burned valve just in that cylinder, you probably have another cylinder about to suffer the same fate down the road. As I mentioned in my reply, it's best to just replace the entire cylinder head. That way you get all new valves and a new head less likely to burn valves.
    Makes sense to me! Especially since the head is off anyways.

    Got any recommendations where to purchase a head? Sorry, I’m just in a Big Crunch since I don’t have a backup car and I’ve been dealing with a sick kid all weekend

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    Quote Originally Posted by newsoltsc View Post

    Got any recommendations where to purchase a head? Sorry, I’m just in a Big Crunch since I don’t have a backup car and I’ve been dealing with a sick kid all weekend
    I purchased the one for my wife's car here: https://www.fiatpartswebstore.com/

    Just make sure you give them the VIN number from your car when ordering the head assembly. Also, I recommend replacing the timing belt, timing belt tensioner, water pump, and the other outside belts while you're at it. You should be good for 150K more miles.

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    Quote Originally Posted by KellyfromVA View Post
    I purchased the one for my wife's car here: https://www.fiatpartswebstore.com/

    Just make sure you give them the VIN number from your car when ordering the head assembly. Also, I recommend replacing the timing belt, timing belt tensioner, water pump, and the other outside belts while you're at it. You should be good for 150K more miles.
    Awesome! Thank you so much!
    I'll have to give them a call directly, their website doesn't show the complete head assembly.

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    Quote Originally Posted by newsoltsc View Post
    Awesome! Thank you so much!
    I'll have to give them a call directly, their website doesn't show the complete head assembly.
    You're welcome. Before you start ordering parts though, I encourage you to get the leak-down test done first. Odds are it's probably the dreaded burned-exhaust valve, but it could be something less expensive like a intake valve actuator, bad primary coil connector, or something simple.

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    Quote Originally Posted by KellyfromVA View Post
    You're welcome. Before you start ordering parts though, I encourage you to get the leak-down test done first. Odds are it's probably the dreaded burned-exhaust valve, but it could be something less expensive like a intake valve actuator, bad primary coil connector, or something simple.
    They did the leak down, and the results were air pissing through the exhaust pipe. So they strongly believe it's the dreaded burned exhaust valve lol

    Thanks for the tips though! I greatly appreciate the help!

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