Hi All,

This summer has been interesting for my 2002 S Type R 4.2 V8. (VIN - M49596)

So far, all coils and plugs have been replaced
Throttle Body has been cleaned
Supercharger has been serviced - coupler, bearings, seals, and oil replaced.

After reassembly and reinstallation of the supercharger, a fault showed up in the Throttle Body.

The Throttle Body was then cleaned again, and as there are only 136 shopping days until that day that shall not be named before December - these codes have now shown up.

P1582, P0306, P0308, P0304, P1314, P1316

My understanding, from reading through the forum, is that these problems correspond to:


P1582 - Notes that flight recorder date is stored

P0306 - Cyl 6 misfire detected

P0308 - Cyl 8 misfire detected

P0304 - Cyl 4 misfire detected

P1314 - Misfire Rate Catalyst Damage Fault Bank 2

P1316 - Injector Circuit/IDM Code Detected. Spark plug detection module circuit malfunction. (Or is it this: Misfire Rate exceeds emissions)


Any ideas as to steps forward?

I have seen it suggested that the following may be the problem:

1. Damp/Wet coils - let them dry and try again
2. Gasket damage - replace affected Spark Plug Boss Seals and Cam Gaskets
3. Cat Damaged - replace Cat.

Any views? Advice?

 

You can get the actual meaning and all known causes from the free download of the workshop manual, JTIS.

P1316 for example is a warning about a big rate of misfires that's causing cat damage.

Try not to drive the car at all until you fix it or it'll mean a cat as well.

 

You're always so quick off the mark, and so helpful! Thank you very much.

I'm looking at how to install the JTIS on 64 bit machines. It is a bit daunting!

 

I've avoided Win64...

 

Too late for me, I'm afraid! I've had 64 for years now. It has been fine right up to this moment!

 

The problem I had when I brought the car in this summer was similar to this:

https://www.jaguarforums.com/forum/s...-117374/page2/

 

Have you cleared the codes to see what comes back?


Have you inspected the spark plug wells for oil/water? The coils/plugs are brand new so they should be working?


What brand of coils and plugs did you install?


Did you do the work or pay to have it done?
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Hi Tbird - thanks for replying.

I'll answer your questions in reverse order.

3. I am paying for the work to be done.
2. I bought the coils and plugs from Myton Automotive, who supply Jag parts. So I bought the OEM, I believe.
1. I have, from browsing this forum, discovered that one source of this problem could be damage to the spark plug boss seals and the cam cover gaskets. I've asked my mechanic to check this. If he discovers oil in there - I'll order replacement boss seals and cam cover gaskets, and get them installed. (I also have asked him to check if the warning light on the dash is static or flashing - I am given to understand that if it is flashing, there's a severe problem with the Cat - is that the case?).

From the codes above, in your view, is anything else indicated?

Thanks,

Cormac.

 

The flashing is to warn the driver that POSSIBLE cat damage is occurring at that moment. So you can stop driving until the fault is fixed.

I suspect oil/water in the plug wells but since you have already changed them I would hope the mechanic would have noticed this and stopped the repair until he talked to you.

But with that many codes we are lost and need to get some kind of baseline to work from. That's why I always want a clean slate to start off with. No telling what has been left in there over time?

Just so I understand you did NOT have any codes to start with?

Can you tell us what caused you to do the initial work?
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I believe it's not POSSIBLE but ACTUAL damage. Do not keep doing it unless you like replacing cats.

 

Oh - the car has been in the garage for a few weeks (we're fixing it part by part). It has only been turned on in the garage where these issues showed up, and has not been driven like this.

My mechanic just called and said there is an ominous knocking noise coming from within the engine. He is worried that it is FUBAR. I'm living in hope that it isn't, and that any such knocking is economically repairable.

I am getting worried about my poor Jaguar...

 

Ok. Having talked to my mechanic - he is worried that there is damage to the engine itself. He thinks that there is a funny noise coming from it, and he is worried that there is some damage to a piston/cylinder and possibly the cam.

I've taken video footage - can you guys have a listen and give me your opinion. If the engine is damaged in this way, it may not make economic sense to fix it (again), as the engine was rebuilt two years ago.
https://youtu.be/Hfj8DHxmv5g

 

Oh not a nice sound . Sorry to hear that , first thing I'd do is pop the supercharger belt off and turn the snout pully buy hand and see if the blower is munched ! If it's smooth
Then maybe run it with no super charger belt , and if still the same ,
then run it with no ancillary belt to try and narrow that noise down ,
also maybe one of the cams have jumped a tooth so would be worth a look at the cam timing components , also a compression test may shed some light on your issue !
Poor jag she's crying out for some love !

 

Hmmm. They've just serviced the blower. I'd have expected that they'd have checked that. I'll see what they say.

What it may come down to for me is that if I have to have the engine opened up, the cost of even such an investigation might rapidly exceed the value of the car. (And I've just bloody finished paying for it).

I'm very much a novice as regards understanding how engines hang together and all the various tests, and so on.

Thanks for your help.

 

its real cheep to do the tests such as a compression test ! well worth it to see if the valves are bent or not ! and if thay are its very un common to have sustained more than a scratch on the piston , so chances are it won't be a full rebuild to fix it , nore do you have to remove the engine to replace the head ! a second hand complete head to replace the damaged one is quite cheep , this one for example $250
01 02 03 Jaguar XJ8 R Cylinder Head 32254 | eBay
ok so its a 4.0 model one and probably the rong side but you catch my drift ! first things first (check cam timing and if its out put it back in) then do a compression test to see if the valves are damaged to see wot your up against !
remember its practically free to pull the belts off and spin things to check them .
reason i said check the blower is because its a quick cheep and easy test to eliminate one thing ! its not running on all 8 thou so suspect cam timing ! good luck!!