I’m new to this forum and new to Jag ownership. I purchased a used high mileage 2004 X-Type with a 2.5 L engine replacement of unknown vintage.

The engine feels solid and accelerates and runs well except for an occasional misfire. I have had the misfire occurrence three times after driving more than an hour and twice after driving less than ten minutes. I have made a round trip of about 3 hours with no occurrence.

When it occurs the engine loses power with a thud and the engine light begins to flash intermittently. The engine does not die, it remains idling, but there is no acceleration. At first it shocked me and I thought it mechanical, but have now concluded it’s strictly electronic.

After a minute or two the engine resumes normal operation and the engine light goes out. When I pull the codes I get the following DTCs.I have replaced all of the spark plugs and the coils, to no avail. I’ve inspected the wiring to the coils with no obvious damage to insulation.

Any suggestions on further diagnostics?

- Shawn

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2004 Jaguar X-Type 2.5L, 5-Speed manual
2003 Toyota Rav4
2003 Chrysler PT-Cruiser GT, 5-Speed manual
2000 Saab 9-3 Viggen, 5-Speed manual
1999 Saab 9-5

 

Look at fuel trims to see if there's an air leak & rule in/out lots of things.

Do not drive more than you must and avoid causing that flashing MIL or your cats will need changing (which they might already need).

 

You replaced the spark plugs and coils (all 6 of each?). Did you see any oil on the spark plugs when you replaced them?

 

Revere, no I did not observe any oil on the spark plugs.

 

Just to be clear: Did you have the codes listed in your original post and then change the coils and plugs? Or did you change the coils and plugs and the codes you posted were what came up after you did the work?

What kind of plugs did you use and did you verify the gap?

Maybe try clearing the codes and moving the coils around to see if the issue follows the coil.

 

Alfadude, 3 coils and all spark plugs were replaced by mechanic that had done engine swap. I replaced the remaining three coils. Had misfire and error codes generated before any coils were replaced, after three were replaced and after all were replaced.

- Shawn

 

Coil 2 is easy to get to. Could you swap it for 1 or 3 and see if the error codes for misfire changes please? It's a quick sanity check.
1313 and 1314 seems a bit more serious than usual.

 

Ok, the problem has continued, but still very intermittent. I can drive for an hour or more with nothing happening. I can only recall this happening once during the day, so it may be impacted by having the headlights on (greater power draw).

This last time I got the same DTC codes as before, but also a new one, P1638.

P1314 Misfire Rate Catalyst Damage Fault - Bank 2
Concern with ignition system and wiring harness on bank 2

P1313 Misfire Rate Catalyst Damage Fault - Bank 1
Concern with ignition system and wiring harness on bank 1

P0300, P0302, P0305
Random misfire detected. Misfire at cylinders 2 & 5.

P1638 CAN ECM / TCM network malfunction
• Module power supply or ground interruption
• CAN open circuit fault; IC to ECM
• CAN short circuit fault
• IC failure
• ECM failure
Refer to power and ground test for suspect module. For IC CAN circuit tests, GO to Pinpoint Test D. Please check part is not on any form of prior authorisation before replacement.

I've checked the cabling to the ECM and it looks solid. Grounding cable to ECM and connections to coils look good. I'm not sure how to do the CAN Circuit test using "Pinoint Test D" as described in the service manual.

Monday after driving 40 minutes on a return trip, the engine lost power and engine light began flashing, so I pulled over and stopped; engine idled, but would not accelerate without missing. I turned off engine and tried to start again after a minute to no avail (engine turned, but no start). Tried again after another minute and no go. After another couple of minutes engine started fine and ran fine all of the way home another 20 minutes away.

If I have a grounding problem or wiring issue, why would it correct itself after a few minutes? Could a general power problem like a voltage regular generate such errors?

This is frustrating.

 

As JagV8 suggested until you look at fuel trims it will be hard to tell whether its ignition fuel related, possibly grounding or CAN related.
Have a look at these threads it is different models but could help?

https://www.jaguarforums.com/forum/x...veryday-62726/

Code P1638 P1000 all dash and gagues

 

Meanwhile cat damage is continuing. Could get expensive!

 

If one found oil what would that indicate?

 

Oil in the spark plug wells would indicate leaking Cam Cover gaskets. The oil can short out a plug and cause a misfire code.

 

How would you fix this?

 

You will need to change the Cam Cover Gaskets. Having done this before I can provide you the steps/procedure and a couple of short cuts that make it a little easier. PM me with your email and I will send some info on how to tackle it.

 

Hi Avery can you kindly send me information as I also need to change my cover gasket too. Much appreciated
kind regards,saj.
EMAIL: sb10@sky.com

 

Just to make sure we’re on the same page, can you please explain what you mean by, “your cats will need changing”.

 

Driving in this state (PARTICULARLY with a FLASHING m.i.l.) causes catalytic damage extremely fast (in some cases in 2 blocks) necessitating converter replacement ("cats need changing").