Twice this last week my 2000 XK8 went into safe mode and started running rough. Both times after sitting for a while it started up fine and ran good but had the check engine light on. I just got through using my scan tool to get the codes. The engine code was P0354. The other said Pending P1111. My home computer has had a problem and I have lost a lot of my reference material. Can someone tell me what those two codes mean?

After clearing the codes the car ran fine and the check engine light stayed off. But I don't think it will stay off. Something is wrong.

Thanks guys.

 

Info for you.

bob

 

Thanks Bob for the info. I don't know if I already had this or not since three days ago our internet provider had a major crash and I lost all my saved Jag data files. So thanks for this info. I will save it off computer.

I gather that Po354 means ignition coli on A4 which is the A bank (right bank) and the #4 cylinder (aft one, hardest to get to).

Going shopping for a new coil.

Thanks Bob

 

​​​​​​
The cylinders aren't numbered like that! From the driver's perspective, bank A or 1 is on the right and bznk B or 2 is on the left.
Have a look at the DTC guide, but 1 is front right, 2 front left and they zig-zag towards the driver from there. So 8 is bottom right.

 

No, EZ had it right. The staggered numbering is for the 4.2.

 

Thanks RJ. At least I got something right. Recently I have had trouble with all my toys. Ever had a week like that?

while I've got your attention. What recommendations do you have for new coils ( Lincoln LS?) and spark plugs.

Thanks

 

I never changed the coils, just bought a couple of used ones on ebay as spares in case there was a failure. The V8 has very little coil trouble, unlike the x300.

For plugs the standard NGK iridium are fine. IFR5N10, I think.

 

Thanks RJ. You're always a big help.

 

Since it has been a week since I had the safe mode, or should I say restricted performance, the car had been running so well that I had hoped it had cured itself. Boy that is wishful thinking.

I started it up this afternoon and went for drive. Ran fine. Put it back in the hangar and shut it down. Decided I had better back it up a bit so I started it up to do that. That's when I got the RP. Shut it down and read the codes. Got PO304 which the DTC from Motorcar Man tells me is "misfire detected cylinder A4 and code PO354 which says ign coil bad cylinder A4, same as before.

Went to work and pulled the coil and plug from cyl A4, right bank, aft cyl. There was a little oil around the base of the plug which should not have caused a problem. However, the plug, a NGK R PFR5G I3E looks funny to me. The stem in the center is not round and flat. Instead it is pointed. Is this normal or is there some other problem?

My next step is to buy a new coil and a set of plugs. Any comments. I don't like this one bit.

 

I shouldn't really offer opinions on plugs since it has been too many years since I changed any, but I do seem to recall pointed center. The number I offered in post #7 may not be correct. I gave all my records to the new owner.

 

The plug I took out is the original plug. They are the most expensive therefore they should be the best. The coil is Denso. I don't see it listed anywhere. I'll probably go with Beckarney there. Hope this fixes the darn thing. These Ford engines. Every Ford engine I have had has design problems. My 50 Ford engine was full of problems. AND my 29 Ford motor has a knock that I'm sure is the center main. Does it ever end?

 

This is a follow up on the misfire on A4 (most aft cyl on right bank). The solution that I hoped would work was to replace all spark plugs since they pretty bad. I believe they were original. I kick myself for neglecting my car service by not changing them sooner. Following that the car ran great. No miss and no restricted performance. But just to make sure it was only the plug I replaced the coil that was on cyl A4 to cyl Bi (front cyl on left bank). Then if I got a code of PO355 it would mean the problem had followed the coil and the coil was definitely going bad. Well today, after a month of on-off driving with no problem the misfire came back along with restricted performance. Checking the code it was PO355. THE PROBLEM FOLLOWED THE COIL. How about that.

Now to buy a new coil. Any recommendations? (I love it when a plan comes together!!)

 

I cannot attest to what the 4.0 uses, as I am more familiar with the 4.2 setup. Just to reiterate, the 4.2 stock spark plugs are NGK Laser Iridium IFR5N10 at a rated life of 100,000 miles.

The original 4.2 coils are made by Denso, but no longer manufactured. Though some forum members have gotten by with cheap China coils, it is not generally recommended as they have been known to fail early and/or not perform like the originals. Forum member Donb purchased a few different brand coils from Rock Auto and said the Standard Motor Products and Beck/Arnley appeared to be identical coils and build quality was stout, but if you want a FoMoCo stamped coil, to buy the Airtex/Wells 5C1420 coils, which will most likely be the same part the dealer sells you, only at a much cheaper than dealer price. Here is the thread if you are interested:

https://www.jaguarforums.com/forum/x...-packs-165716/

Also, for anyone else curious as to the cylinder numbering on the 4.0 versus the 4.2, here is a chart:

 

Thanks Chilly. I appreciate the info and thread address.

The later X100 changed the cylinder number system. The right bank is one thru four. The left is five back thru eight. A lot more sense. And are referred as A for right and B for left. It is interesting that the number one cylinder for all engines is the most forward cylinder.

 

EZ that looks to be for the early cars.

Jaguar moved to standard numbering.

 

If you look at this link that Motorcarman sent me in response #2 above on bottom of page 1 and top of page 2 you will see PO354 designated cylinder as A4 (aft cyl right bank) and PO355 designated cylinder as B5 (front cyl on left bank). That corresponds to exactly how I moved the coils to check if the problem followed the coil or not. And it did.

Someone else recently published a correction to that diagram shown above.

RBPI-2018-01.pdf

 

Might be of interest...

Mark B.

 

This matches a 2000 (pre 2003) XK8.

 

Before spending anything. Simple stuff. Move the coil to a different cylinder. See if the code follows. Go from there .

 

That is what I've been doing. The problem has followed the coil. Waiting for the results of one more swap.