I have a 2004 Jaguar x-type 2.5l with an intermittent cylinder misfire issue. Some times I crank up and the car runs fine even though I can hear a slight mis. The car will go through all gears and no limp mode while other times it goes into limp mode as soon as I take off. After the engine warms up it runs better sometimes no misfire, no limp mode runs strong. Then later it goes back into limp mode. No vacuum leaks and all orings on intake changed. Sprayed either on all intake lines and no pick up. Spark plugs and all coils changed about 20000 miles ago. These are the trouble codes I'm getting. Any help would be greatly appreciated.

 

Please update your location to something that is real.
A country and state may help other members give you more specific local advice.

 

Let's try to give you some things to check and see if we can narrow down and resolve your problem. First on the list is the correct code definitions.
The P0301, P0302, P0351 and P0352 identify the problem cylinders as misfires on cylinders 1 and 2.
Cylinder one i is front of the engine closest to the firewall/passenger compartment. Cylinder 2 is front of the engine closest to the radiator.
The P1646 and P1647 shows coil failure on cylinders 1 and 2.
The code P1316 is an indication of excessive misfire and potential for catalytic convertor damage.

We will work with the cylinder 2 misfire first as it is the easiest to access.

The first step is to clear all of the codes with the code reader.

The second step is to take the ignition coil from cylinder 2 and swap it with cylinder 4, the middle cylinder on the engine closest to the radiator.

Next start the engine and take it for a test drive. Then read the codes again. Did the misfire move to cylinder 4? If so then the ignition coil is bad and needs to be replaced.

The assumption would be then that the ignition coil for cylinder one needs to be replaced also.

Replacing the cylinder 1 coil requires removing the intake manifold.
Run the test for the bank 2 coils and get back to us.

 

I can't believe I could have a faulty coil. I changed all of them and the rear cat about a year ago. But I suppose anything is possible. I will give it a shot and let you know.

 

While you are swapping the 2 and 4 coils check the wiring to the 2 coil. The codes listed also include possible wire damage, connector damage, loose connection and grounded connection. Swapping the coils is the easiest way to to check.

If the fault moves to the 4 coil then the coil is bad if it doesn't then it's a wiring problem.

 

my guess would be on the 02 code?
02 sensor issue could give misfires and eventual misfire rate and CAT related codes.

If your new coils were all genuine and you replaced the plugs at same time, it might be worth clearing codes to see what recurs.

 

You could start by making sure your battery is in tip-top shape. Check for near 13 volts on a meter.

 

I guess it's my fault for going with cheap non name brand coils. I swapped the two faulty coils with the original Denso's that I pulled last year and all codes are gone except P1000, P1646, and P1647. I reset the computer and all codes show pending and the CEL is currently out but im not sure what will happen with those pending codes. Thanks for all the help.

 

Once you have completed all of the necessary drive cycles the P1000 should go to P1111 provided there are no more problems. You will always have either P1000 (checks not complete) or P1111 (all checks complete).
The 1646 and 1647, if you have no further issues will clear.

 

I think P1111 rather than P1100.

 

Duly corrected thanks JagV8