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Jaguar XJ-Series Fuel System Questions

47 messages,  Last post on Feb 26, 2013 at 11:49 AM

You are in the Jaguar XJ-Series Forum.

What is this discussion about? Jaguar XJ-Series, Fuel System, Sedan

Messages Page 3 of 5

#17 of 47 Re: talking to myself apparently [myusername2] by pat

May 15, 2008 (5:12 pm)

Replying to: myusername2 (May 15, 2008 4:31 pm)
Yeah, you're right, there haven't been a lot of posts here lately. But oftentimes a new post (or three ) will attract other posters who are waiting for something new to read.
 
However, if no one shows up soon, try posting in our Answers section over there on the right sidebar.
 
Good luck - hope we can help one way or the other!

#18 of 47 Re: 1999 JX8 fuel filter replacement [jag21] by Mr_Shiftright HOST

May 15, 2008 (8:13 pm)

Replying to: jag21 (May 17, 2007 2:18 pm)
The Fuel Filter is located along the frame rail, next to the fuel tank, and near the driver side rear wheel.

#19 of 47 Re: Update on my 1998 XJ problem [pat] by poetlorryit

Aug 08, 2008 (1:05 pm)

Replying to: pat (Jan 25, 2007 6:46 am)
Just been reading Sep 08 issue of Jaguar World and it has an article about changing the timing chain tensioners. Any 4.0 AJ-V8 built before 21st Oct '98 will have a plastic bodied TCT which fails and causes catastrophic engine damage the valves and pistons unite in unholy matrimony. If your engine number is 9810210599 or less then it will have the bad tensioner if it has the original factory one still fitted. You need the newer 4.2 spec ones fitted real soon, it says if you can hear any chain rattle from the front end switch it off and tow it to nearest garage before it die$$$. Added to that this engine has a $3k throttle body mod that needs to have been done or it stalls a lot and those cylinder liners are nickasil if manufactured before sep '99 which can fail causing low compression.

#20 of 47 1991 jag. xjs by johnwesley1

Apr 22, 2010 (8:07 pm)

can someone tell me the firing order of my 1991 jag. xjs v12 also which piston do they call number 1. also where is the fuel filter located on this car..the car seems to idle ok but has no power when accelerate. it will drive up to 60 with no problem as long as you get there slowly. this started all at once while i was driving i just lost power.

#21 of 47 Re: 1991 jag. xjs [johnwesley1] by Mr_Shiftright HOST

Apr 23, 2010 (7:30 am)

Replying to: johnwesley1 (Apr 22, 2010 8:07 pm)
FIRING ORDER 1A-6B-5A-2B-3A-4B-6A-1B-2A-5B-4A-3B
 
  Cylinders numbered from front. As it is viewed from rear of vehicle (driver's seat), "A" is right bank and "B" is left bank.
 
Fuel filter Located in trunk behind spare tire.
 
Your symptoms suggest you could have dropped a cylinder, either a bad plug or wire or an internal issue. With this V-12, you wouldn't necessary notice a missing cylinder at idle but you would when you accelerate.
 

#22 of 47 Re: 1991 jag. xjs [Mr_Shiftright] by johnwesley1

Apr 23, 2010 (10:46 am)

Replying to: Mr_Shiftright (Apr 23, 2010 7:30 am)
Thank you for your reply. i always come here for advice and always get good feedback. I have another question if you dont mind. I am going to change my exhaust system to get a more mellow tone and hopefully improve the performance some..more for the sound rather than performance. I cut off the exhaust system just in front of the converters and plan to run a straight through exhaust back to the resanaters. when i removed the 2 into 1 pipes from the manifolds so i could weld on the straight pipes to them i noticed the tops of the pipes are somewhat solid i know the exhaust flows through them ok but dont know why these are there. Are they for back pressure or what? would it be ok to knock these out and allow a straight though eshaust or would this hurt performance? Thanks for any help and info you could give me..All the performance engines i have built I have never seen any exhaust pipes have this type of solid type look comming right out of the manifold

#23 of 47 Re: 1991 jag. xjs [johnwesley1] by Mr_Shiftright HOST

Apr 23, 2010 (11:27 am)

Replying to: johnwesley1 (Apr 23, 2010 10:46 am)
Yes backpressure is always an issue. I think your plan will result in very loud exhaust noises and possibly you will lose some performance on account of insufficient back pressure. Exhaust systems are somewhat of a science so I suspect the engineers restricted the flow in the manifold for a reason. I can't really say. Could also be for strength/noise suppression.
 
In any event be prepared for a bit of a racket at highway speeds.

#24 of 47 help by johnwesley1

Apr 26, 2010 (6:46 pm)

Help !!!! As per my last posts i'm having problems with my 91 xjs v12..as before the engine had no power. it still run and would go down the road but with no power i could tell it seemed to be on the right bank (bank A) i thought maybe the catilinc converter was cloged so i cut it off and ran a str8 pipe back..Ok after starting it seemed better but still no power and now you could really tell it was on the right bank missing bad like not hitting on all the cylinders. so i completely tuned it up new plugs, plug wires, dist. cap and rotor, new fuel filter. Now its still missing on the right bank. So I switched the coils after doing that right bank seemed to be running ok took it for a short ride still no power but now seemed to be the left bank now. all of a sudden i saw smoke comming from under the hood got out to look and the converter on the left side was glowing red. I got it back home and let it cool down and tried to start it but no fire at all so I switched the coils back and still no fire wont start at all now..I know the coil on the right bank must have been bad cause after i switched them the right bank seemed to fire ok..my question is why would the bad coil now on the left bank cause the converter to get so hot i mean red hot..never had that problem till i switched the coils..now i'm guessing both coils have gone bad cause i have no fire at all. I ordered 2 new coils but hate to put them on if i have another issue causing them to burn out. I'm sure they are the origenal coils that came on the car. just seems funny they both quit at almost the same time..sure would appreciate any imput you may have for me..thanks

#25 of 47 coil problems by johnwesley1

Apr 30, 2010 (10:36 am)

I am getting no fire out of my coils replaced old coils with new still getting no fire out of coils. any suggestions?

#26 of 47 1994 Jaguar XJ6 by rhemcomm

May 05, 2010 (12:33 pm)

Car runs but will cut off. Sometimes Starts right back up and sometimes wont. Not getting any Vehicle Error Codes. I believe it may be a fuel Problem. Could it be a Dirty Fuel Filter?

Messages Page 3 of 5

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