its unusual for a woman to enter the query and have a legitimate understanding of the machinations of this beast.

Recently the digital board is telling me after about 5 miles of driving that I have a fuel failure. No Codes are evident. The vehicle will then stall out.

Upon restart there are still no codes and everything seems fine for another 5 miles or so. then again the stall.

I have replaced the fuel filter and presently awaiting the parts for the fuel pump and regulator.

Being a pro-active type personality, the only other cures seem to be crankshaft sensor and the MAS sensor. Is there anything I am overlooking that could potentially be the issue for this jag?

She is in beautiful shape and the thought of expending a lot of cash for work that I can do, seems redundant and wasteful.

so help this damsel and let me know what else the issue could be?

 

Welcome to the forum JagGroupLLC,

I've moved your question from Jaguar Forums Advice / Feedback & Suggestion Center to XJ40 forum. Advice / Feedback & Suggestion Center is for questions about the forum and not for tech questions.

Members here with the same model will be able to assist.

When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

There are basically 3 iterations of the XJ40
1988/89 3.6 liter
1990-1992 4.0 liter
1993/94 4.0 liter

There are differences between them and your MYSTERY car MY will fall into one of these.

The 1988/89 has the most simple VCM with only 5 faults that are detected.
The later cars (1990 MY onward) are a little more sophisticated and have more codes and fault diagnostic procedures available.

Look for the Jaguar Publication S-91 I uploaded if you have one of the later cars.

bob gauff

 

Does it act funny before it dies? Does it restart immediately or easily? Could it be a hose getting sucked closed?

 

ok a "tech" question.

I did not receive an email confirmation link for this site.

Is there anyway to get one sent to an alternate email to ensure receipt?

[personal eMail address removed - GGG]

 

I've edited out your eMail address from post #5 before you get inundated with spam from the web crawlers.

Checking our Moderator Control Panel shows me it's the same email address as you have registered with the forum. Please let me know if you still have issues receiving forum notifications.

Graham

 

Well the fuel pump and the regulator got replaced with new. Vehicle ran fine for about 2 months, now it's starting all over again. Took me over 2 hours to drive 8 miles because of the constant fueling failure.
I have attempted to replace the relay - only the colors dont match according to the schematic. Seems I am missing about 3 of the colors (purple, brown and yellow)
The VCM says FF2, but I cannot seem to locate the O2 sensor to replace. I have also been told NOT to replace this part unless it is critical due to some reason or another (mechanic never really gave any reason, just do not replace)
I'm ready to dump this beast! This is the only real frustrating part of getting this girl running again. Everything I have been able to handle on my own.

Please help this damsel in distress -

 

A stuck or corroded 02 sensor relay can cause the car to crap out too, might be worth a check - what year is your car?

 

1989 VDP in-line 6 (3.6 liter)

This is certainly becoming an even bigger issue now as several of the repair shops around me allege that it is not the O2 sensor as the codes are limited and do not want to deal with the time or expense to determine what the real problem is (one told me it could be a straight electrical issue and was even fairly polite when he refused the work)


Please - I can deal with a lot of stress, but this is literally causing anxiety attacks!

 

the only acting funny it does is that the engine begins to literally knock and then you can see the RPMs decrease and then voila! the large exclamation point and idiot code "fueling failure 4". If i am lucky i can get to a safe zone to shut her down. Otherwise, the drivers here in CALI are quote brutal and not very helpful (unless you prefer the single digit salute)
Am told the O2 sensor has nothing to do with the engine stall - so I am really really confused now...

 

The sensor won't make the engine stall, but a failing o2 Heater RELAY will cut off the power to the fuel pump

 

so what exactly is the failure O2 heater relay?

I have located the fuel pump relay under the knee plate on the passenger side - BOY was that relay hot to touch! yowzers!!!! replaced that easy enough once it cooled.

Where is the O2 heater relay located on the vehicle?

Does the ambient temperature have anything to do with this nonsense? Past week its been about 85F + and then yesterday and today its been really cool 65 or so and car is fine....

 

I just checked your model year - you don't have an 02 heater relay so forget it!

 

Sounds like the throttle potentiometer. Had similar symptoms on mine.

 

JagGroupLLC,

I have an '89, and I had to replace my O2 sensor because...... wait for it..... it was causing my engine to cut out!

You haven't posted for a few weeks, so I'm not sure if you gave up on the vehicle. I hope not. Most of the issues with the XJ6/XJ40 are small items that need a one-time fix ... if the fix is done properly.

Hopefully you'll let us know what the disposition is.

 

I am not sure to laugh or cry at the moment... laughter seems more positive and doesn't make such a mess.

As this beast operates in Sunny SO Cal, inland empire to be exact, trying to locate a mechanic to replace the O2 sensor is like looking for a needle in a haystack. No one and I mean NO ONE will touch this car. The impression or interpretation of the conversation seems akin to not wanting to have to actually work on the vehicle. As most of the newer cars; all makes, all they have to do is hook up the computer and away you go, minus a few hundred dollars.

I would preform this repair myself but am unable to locate the sensor. Repair book states its on the top of the engine block next to the injector rail; however, my Jag has no such sensor there.

Is the O2 sensor on the underbelly of the car by the catalytic convertor? or someplace else and I am totally blind.

 

JagGroupLLC,

Yep, it's a get-under-the-car job. It's located on the exhaust system.

Got an Idea, why don't you start a new post with the title "looking for a mechanic in ...." and see if you get some responses. I'm confident you will. I think there is also a section on the main page where there are regional forums/posts for members who are geographically close to each other.

BTW, my symptoms were I'd be driving along and suddenly the car would sort of lunge or choke and then die out. Sometimes it would start right away, other times not. Either way, my mechanic at the time changed out the O2 sensor and no problem since.

Good luck, keep us posted on progress.

 

JagGroupLLC,
In my opinion, pics beat words when it comes to locating what you are looking for.
I believe the illustrations in the link below should help you.

http://www.justanswer.com/jaguar/58p...nsor-post.html

Kind regards,
Karl

 

There is one O2 sensor on a 1989 XJ40. located on the down pipe after the first catalyst. You can visibly see it from above, but in order to apply torque to remove, you'll need to be underneath the vehicle. I'm sure someone has done it from above, but there is risk to improperly applying torque and damaging the threads.

Go to section 6.4 for a description of the sensor, trouble shooting and removal. It's in the XJ40 Online Haynes manual: (jaguarforums.com site)

http://www.mediafire.com/?hx8bttsy4kxxr#3267xri9vx4v6

Click on the pdf icon to open or download.