I finally got the damn injector out. It broke in the process so I used a bunch of different tools. Then I started the engine but it still misfires. I changed the plugs, coils and injectors. Could it be a loss of compression? By the way, I've done 200,000km. I'm going to measure the compression pressure, but what's the best way to deal with it if it's a loss of compression? I'd like to do something about it by cleaning it or something.

V6 SC 3.0L

https://youtu.be/9GAvZfNJNgA?si=PosDavmFPu_V9yVg

 

When it originally happened what were the codes

 

p0305 p1315 was displayed

 

Sorry, it was p0304

 

Where did you get the coil from? Those codes together certainly indicate a misfire caused by the ignition coil. Did you try to swap coils with another cylinder to see if the misfire follows?

Dealing with compression issues is totally going to depend on what the cause is.

 

I bought the coils from a Chinese website. I still have three new ones. Will the plugs ever fail?

 

Please read this as you probably have counterfeit parts. I went thru a MESS because of this in my car and it was not easy to figure it out!
Counterfeit Injectors

Check the pictures in the above thread and compare to yours. It's recommended to change the entire bank of injectors rather than just one or two. Jaguar did this back when the cars were under warranty. Not sure why other than the amount of work/time it takes to access the injectors and you need to pull the fuel rail even if only replacing one injector. So the work to replace the other injectors on that side is pretty small. The LAST thing you want to happen is the car not to start and you have to go back into it again!

I know I have done it 3 times now because of counterfeit injectors.
Anther tale of woe.
Injector Problems

I also did a compression test and it was fine. I bet yours is too. Plus I checked for spark on both sides of the engine AND checked the gear driven mechanical pumps for pressure.
Until you get it started I would put the OEM coils back in. Injector problems are far more common and you want to eliminate as many after market parts as possible.
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This is what I was getting at and why I was asking, so I agree this is a possibility. Sure, spark plugs can and do go back, but less often than one gets a counterfeit coil nowadays, sadly. When testing, a first test would always be to swap a coil with another cylinder and check to see if the misfire follows. If so, verified coil problem. I suggest doing that here as well.

Where I disagree is swapping all coils. Seems to only people who suggest doing this make money and thus have a vested interested in suggesting this. It isn't wrong to do, just don't think it is necessary. In fact, so long as plugs are replaced appropriately, coils can last 100,000+ miles. I get that parts, especially electrical parts, especially Jaguar electrical parts, are expensive; however, electrical components are things that I never skimp on for this very reason.

 

Thank you everyone. I just measured the compression of cylinder 4 and it was as shown in the video. It's at 10 bar so the compression may be fine. I tried swapping the plug with the one next to it but it didn't change anything. I also removed the coil and confirmed that it was making a crackling noise and replaced it with a new one but it didn't work. By the way, the diagnostic machine said that cylinder 4 was misfiring, but is the counting method in the image correct? It's a 2015 V6SC. On the autel diagnostic machine, it shows p0304 and p1315, but when I looked at the live monitor of the diagnostic machine, it was strange that the count number of the item [Combined Misfire Information Cylinder 6 Emission Misfire Count] was counted many times.
I feel like the way the diagnostic machine counts the cylinders is lying. Or maybe it's because the injectors are fake. There was no marking.

in missfire cylinder 4

the compression

 

I don't think that cylinder numbering is correct. See this thread. There are a couple of diagrams midway down.

https://www.ftypeforums.co.uk/viewtopic.php?t=5762

 

I saw the article and it seems like my cylinder count is correct.

 

Really? Maybe I am missing something here, but I don't see where what you have diagrammed in your picture is the same as the V6 here. Note, the one on the bottom left says it is for the Pre-2003 MY of an S-Type.



I have seen similar reference elsewhere as well. If you really wanted to know for sure, you could always just unplug the coil on each one at a time and watch realtime data to see which cylinder is misfiring.

 

you cylinder order is correct in post #9
do you have images of your Fuel trims

 

I'll check the order again. I removed the coil for cylinder 4 in the #9 image, but the location of the misfire monitor didn't change. So I think it's cylinder 4. Is P0657 irrelevant? Where exactly is the fuel trim?

 

I checked the injectors and there was no marking on them. I replaced them with ones that did have the marking and the misfire stopped! Thank you so much. I appreciate it. Do those damn Chinese people have some grudge against Jaguar? There are only two other problems, P0117 water temperature circuit abnormality and the exhaust sound valve not responding when the switch is pressed. I replaced both water temperature sensors with new ones but it didn't work. Does anyone know what to do?

 

Correct that's what I told you up thread?
I had the exact same problems because of counterfeit injectors.
Throw them away unless you think you can get a refund from the seller?

It's all brands and all parts there is no targeting of Jaguar with these bad parts. It's a multi-trillion dollar world wide problem that effects almost every product in the world.
It's not just us!
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That's correct. I'm very grateful. The official Japanese dealers aren't very helpful either. Some of them have never even removed the injectors.

 

The correct injectors should have a white band and numbers along the plastic for future refrance

 

Don't forget the stylized Hella symbol too. I have a picture of this in my attached thread. Hella owns Bosch.
There are several clues if you look at the markings but they are close. They have copied the shipping boxes just about perfectly.
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