No he said he couldnt see any oil....

 

Just thinking out loud here:

As I have been thinking about this issue. If the plugs are new and there are newer coils in the vehicle and only one cylinder is misfiring, I don't believe that the cc is bad or going bad nor the up or down stream sensors. Since there is no sign of oil in the spark plug well either.

There have been cases in the 3.0s that either in lower intake or upper intake (Plenum) that a gasket or seal is going bad to one of the cylinders, in this case cylinder #5. I do remember a fellow member had this problem with no codes (weird but true).

 

Just my 2¢, but my 2001 3.0 had a similar problem, which turned out to be chaffed coil wires by the fuel rail connector. My problem was intermittent until I started blowing coil fuses. It may be worth the minute that it takes to look at the wire loom. It's awkward to get to, I suggest lying on the engine (hey, my bay is clean!). I did all of the above, including replacing the fuel pump, and ended up spending a few cents on tape and plastic loom.

Again, it's just my 2¢

 

Good point - I've seen more than one person suffer that problem on the pre-2003 cars.

 

UDATE

i had the coil changed and that has solved the problem. no issues since then so im hoping this has resolved the issue.

Funny thinh is the could was new... im gonna have all the gaskets and other stuff changed over when i get it serviced but everything seems to be fine now.

Thankyou everybody for the help and advise.

 

Glad to hear your kitty is purring again... for some reason coils can be "hit ot miss", even new.

 

Sib,
This is exactly how my problems started. The car would only hesitate with the RPM's at first. The engine light would only flash for a second then go off for days. As time wore on it got worse and worse. I changed all my plugs and coils and IMT o-rings and intake gaskets. Unfortunately this did not fix my problem as the car idles rough and will not go above 3000 RPM's. Keep us informed as to how you get yours fixed.

 

Ezrider800 - Sib's drivability issue sounds fixed - I believe he mentioned a faulty coil - See Post #25 - If your in park or neutral - the rev limiter will not let the engine rev past 3,000 RPM - if you have a fashing CEL - chances are you have an intermitent misfire - best bet is to test each coil with a COP (Coil On Plug) tester - best and fastest way to identify even an intermitent coil misfire - hope this helps - even if you have new coils - they are finkle - feel free to read this entire thread

 

Abonano,
After changing the plugs and coils I started the car and she ran rough. I started unplugging the coils one at a time to see if I could find a bad one (even though they were new). With the car running I unplugged 5 coils and the engine ran worse each time indicating that the 5 coils I did this to were in fact firing. Of course I could not reach the one farthest back on the passenger side under the intake manifold. I'll have to dissasemble the whole deal again to get to it. So I thought I'd look for other things before going through that...............

 

well i had the codes read which told me that there was a misfire, i didnt have a code machine so i took it to a electrician who i knew had a proper jag one. dont use a generic one as that didnt pick up anything.

If it still doesnt pick up anything try to get readings while the car is running, if the engine misfires it should catch the problem.


good luck

 

The generic ones are generally fine if used properly. Lots of proof on here of DIY and fixes using them. Sadly many UK places are ignorant of how to use the tools they own, but can & do swap parts instead.

 

I found a code P0355 which indicates there may be a short in the plug to the coil pack or an open circuit (no ground). Problem is mine is on #5 which is the one in the back under the intake manifold. SO I get to disassemble the whole car again to look at it...............

 

I think "Sod's Law" applies

 

I have gotten pretty fast at removing the upper plenum (intake to get to that coil, 15 minutes tops!

 

Maybe im wrong but when i took my v6 to jaguar, cylinder 5 was on the nearside, not under the plenum.

you may want to check your arrangement.

just a thought....

 

Sorry to say but in this case you are wrong. The numbering changed from non-standard (original S-Types) to standard (post 2002.5MY / 2003MY USA).

 

Previous to 2003 #5 wasa actually the middle cylinder on the driver's side.
They were numbered like this.............

Front of Vehicle
4 1
5 2
6 3 firing order was 1-4-2-5-3-6

2003 and later V6 engines were numbered like this................

Front of Vehicle
2 1
4 3
6 5 firing order is 1-2-3-4-5-6

They totally changed the V6 engine after Ford bought the company it looks like.

 

The link below shows the way mine is setup.

2001 Jaguar Firing Orders

This was confirmed by my local Jag dealer garage.

I dont pretend to be an expert, i can only speak of my experience with my car, it could be that other models and regions had different configs.

 

Sib, that is the same as EZ posted above.

 

Sorry didnt realise that