I am having issues with misfire changed spark plugs ignition coils cleaned my injectors changed maf sensor pad still having misfire and code p0300 so just random misfire could a dirty or damaged ground cause it to misfire stutters at my 3 rpm and draws down any help would be appreciated

 

Kem55esh, if you open the hood/bonnet of your car and look in the left corner by the headlight, you will find your ABS unit. If you look behind that, you will be looking at the top of the wheel well. If you look there, you should see a bunch of wires bolted to the metal structure there. Undo the bolt noting the make up of the wire stack (ie, note which one is on top, next down till you reach the bottom, this stack is actually important). now, using some sand paper, wire brush, contact cleaner, etc, clean these ring lugs, the bolt, and the spot on the body where things make contact. Restack things and then see what you have.

Please keep in mind that I am assuming you have the V6 motor as you do not state the year or motor of your car. For issues like this, stating year, model, and engine are key things to getting a clear and proper response.

 

Yes it's a 2005 x type 3.0 v6 supercharger I will try that I'm experiencing a misfire bad gas mileage and gas smell the code that is popping up is p0300 witch is a misfire somewhere so hoping I just have a bad ground connection somewhere. But thanks for the help and I will get back with you to let you know if it helped or not!

 

Gaskets seemed good and O rings around all the injectors seemed good and no leaks just more build up around cylinder 5 when I pull the intake off than the rest also had a misfire before so changed out the ignition coils and it fixed it til now so changed out spark plugs witch most was foul and bad looking shifts better thst I changed them and the maf sensor the air filter looks good also but still have the misfire and hard shift and stutter so was wondering if a bad ground can cause the issues even though my lights or anything doesn't go dim or flickers or if there is something i haven't addressed for the misfire also I noticed tonight my heat isn't working since the misfire and rough running

 

Kem55esh, I still think you need to look at the ground points for the coils on the right front wheel well. That is a known spot to have electrical issues which would cause the coils to not fire with their normal intensity, leading to the misfires.

Before we go much further, I am not sure if you are mis-speaking or if you have someones project. The X-Type next came supercharged. So, I am not sure why you keep saying that you have a 3.0L V6 supercharger. If you could clarify that for me, this may help lead to some of the issues that you are seeing.

Now, becaues you are getting wetting on all 6 plugs from the sounds of things, you may want to also look at the fuel pressure regulator (near the throttlebody). If that line develops a leak/breaks, that will cause the fuel rail to run at too high of pressure, leading to a rich condition on all cylinders. I would find the fuel pressure regulator and you should see a line coming off of the top of it. Follow that line back to where it taps into the intake. Make sure that hose is intact and not developing any leaks.

 

I wasn't able to check the ground points today because of rain I did check my fuel regulator hoses and seen no issues with them but I'm going to do as you said and check all my ground points first to see if that helps.and if not ill switch out fuel regulator also keep saying supercharged bc it's a jaguar x type supercharged.

 

 

I think the "superchrged" badge was an aftermarket addition as the supercharged X was a one off experimental development that the only existing one was gifted to the Jaguar Heritage Trust.

https://www.jaguarheritage.com/car/2...d-v6-x400-svo/

 

I'm guessing it was added to it to since whoever owned the car before me had put a cold air intake turbo fan in it?only thing I see under the hood that was added to the engine

 

Kem55esh, remove that fan. Tests have been done and they have found that it actually sucks more power via the electrical system than it helps the engine create. So, you are losing power with that in the intake. Just saying. that may be causing your rich condition too as it is restricting the air flow possibly and that is causing the ECU to over fuel the cylinders.

 

I seen the grounds here was they the ones you mentioned ?and cleaned them plus a couple more by the abs system and still no difference i will pull the fan out tomorrow and look for more grounds to clean thanks for all the info andd advice 👍 any idea where the earth ground is located so i dont have to search?

 

Took the fan out the cold air intake and got a little more power but still having the misfire and stutter cleaned and tightened all the grounds but the earth ground so I guess next step would to change out the fuel regulator on the fuel rail?also I don't have no electrical issues goin on such as no lights dimming and have power while driving just the misfire and stutter plus excessive gas usage also noticed i can Rev my car up in park and it won't go over my 3000 rpm

 

kem55esh, yes, that is the area that you should have cleaned the connections. The other thing I would look at is if you look under the intake, you will see a large silver rail running across the top of the engine in 2 spots. It will be resting on top of the fuel injectors. At one end (forget if it is by the IMT valves or the throttle body), you will see a device in line with a rubber tube coming off the top. Hand over hand that rubber tube and make sure it is in good condition. If that gets a leak, it will cause the fuel rail pressure to not be correct, leading to the misfires you are seeing. Replacing the fuel filter will be a good thing to do too.

 

I had the intake off and checked all hoses that run to the fuel rail ,also took fuel rail off when the misfire came about and cleaned all the injectors none seemed dirty could It be a injector still and if so it would tell me witch cylinder isn't working correctly correct instead of code p0300 it would be p0301-06 going now to get fuel regulator to see if that is the issue.

 

The person thst owned it before me had powerwashed the engine causing a misfire through the ignition coils so changed them but not the spark plugs and 2 weeks later misfire came back so changed spark plugs and still didn't fix the misfire. And it revs up all the way right when I start it but after a few seconds it don't go past my 3000 rpm also learned he wasn't running premium unleaded fuel through it just regular unleaded would that hurt the car any ?