I'm 500 miles away from the car and trying to assist troubleshooting remotely.

A shop in Carson City has my Jaguar. In the course of getting some other things sorted, they ran it out of petrol. They put in 3 gallons of premium, and it re-started, but it isn't running right. First corrective action was to replace the fuel filter. No change in how it ran. The fuel pump sounds good. I suspect the filter sock in the tank. Mechanic in Carson thinks it's the fuel regulator. His next act will be to test fuel pressure before the regulator. He says he doesn't have a way to check it after the regulator.

Thoughts?

The other work was fuel lines under the bonnet, including the ones from the fuel rails to the injectors, as those were leaking. This was after a no-start that took them a year to get to and wound up being corrosion at the ignition module in the right front fender. I was working out of the country, so they back burnered it.

 

A bit vague n the symptom. Did they give any details?


The sock is in the sump tank and the sump tanks are notorious for getting crudded-up. So, yes, your idea is very plausible


It can be done but he'd have to cut a fuel line (and then replace it) to check the pressure after the inlet regulator (but before the outlet regulator). A nuisance, but quite doable.


That kind of work puts hands in close proximity to lots of brittle, heat-baked wires and vacuum hoses. The injector harness particularly. It's very easy to inadvertently do some damage. Some might say almost unavoidable.

Cheers
DD

 

That was my first thought as well. I inadvertently ran out of gas on a test drive after reinstalling my IRS, forgetting that I had to drain my tank to replace the over axle return fuel line, but once adding gas it ran just fine. I doubt that merely running out of gas is the issue. At a minimum they should take a mechanic's stethoscope to each injector and confirm that are clicking on/off.

 

Exellent poinst all above. A new B bank FPR is not expensive and better than messing about cutting the fuel lines.
I believe a new pump is called for. YOu only have to run a dry pump for about 10 to 15 seconds to ruin the impeller. A few years ago i ran my car out of fuel because of a failed low fuel warning light bulb. The pump seemed OK but failed about 2 months later.

 

Assuming the beast WAS running just fine before the fuel mishap, the pump is my go to also. Greg has 10 to 15 seconds, I say 10 MAX. NOT unigue to Jaguar in any way.

LH ( Bank) FPR, good idea as an age related should be done anyway.

Delete the RH (A Bank) FPR, its NOT a PR, its more trouble than you need on any day.

 

Talked to the guy. He said it runs good when first started and then runs rich. He's talking about looking at injector seals. I'm wondering if some schmutz made it all the way into an injector and is causing it to stick open. Or maybe something to do with O2 sensors.

 

What is the injector loom like? Rich running has to be an injector pulsing fault, poor seals would make it lean, I think. In most cases really rich running is caused by a loom short.
I do not know what condition a failing o2 sensor would give, but if only a bit rich, rather than catastrophically rich, they might be the cause. Perhaps someone who knows the effect of failing sensors can help?

 

I am with Greg here.

AND

The CTS (Coolant Temp Sensor), the one on the B Bank stat casting, has 2 wires. Cheap as chips and BONUS, NOT unique to Jaguar. $25 last Bosch unit I got.
The wring AT and TO that sucker is well documented as flaky on a good day, simple fix, no matter what.
Injector seals, NAH, lean as hell, and rough as guts if they leak, NAH, even without the aids turned ON, you can hear them whistle.
EFI loom, hell yes, and should be above #1 on any V12 "to do list".
The Vac hose that runs from the balance pipe TO the ECU, that sucker is OLD now, and possibly leaking. REMEMBER, less Vac = MORE fuel, More Vac = Less fuel. Simple, just like the car.
O2 sensors (we no got, whoopee), are simply trimmers, and I seriously doubt they would do that.
Blocked/restricted exhaust system, that will choke a V12 real quick, and lack of use is the #1 reason, followed very closely be NOT kissing the Redline from time to time.

A few beers work there, and always fun.

 

So they found two broken injectors, as in fractured injector body. They went ahead and ordered two before I got in touch with them. I would have had them do all 12. They got it back together and my roommate picked it up. She said it ran "alil rough". I haven't been home to check it out in person.

 

I went home for a weekend and got to check it out a little bit. First I had to charge the battery to get it to start. With that done, it runs, but badly. It drives, badly. It's not firing on all cylinders, but the exhaust doesn't smell like fuel, so I'm pretty sure it's a fueling issue. My first guess is that the injector harness is done. I decided to get my motorcycle up to fully mission capable status instead of further troubleshooting on the Jaguar, so that got done.

Bar risers are on.
An oops had happened and I broke a clip-on handlbar. I bought some aftermarket ones that move the hand position up to a more older guy friendly position. Worth the money.

Additional troubleshooting on the Jaguar will happen after I get home.

 

I finally got to take a good look at it. The injector harness is toast. It's only firing four injectors. I'm ordering a new harness today. I made a short video about what I found.


What else should I check while I'm at it?

 

Well found and quite expected.

What else, OH BOY, how full is that Beer Fridge.

ANY and ALL electrical; connections, one at a time, and TAKE YOUR TIME.
Engine Earth Strap/s, and add a dedicated engine to chassis cable.

Just look around, look some more, and you will be fine.

 

Curious how this story ended. I hope it's not what happened to me. My mechanic ran out of gas and when he restarted it -- it caused a backfire. They won't always admit that part of the story. The backfire ended up damaging the valves. After removing the head and a trip to the machine shop, I have 1986 Jag that runs as well as it did when new.

But restarting these after running out gas is touchy.

 

I replaced the injector wiring harness which got it up to ten injectors clicking. The two that Action Frame put in aren't working. I also ended up replacing the spark plugs, cap, and rotor, and the coolant temperature sensor. After that, the throttle potentiometer tested "indeterminate". I ordered another one six weeks ago which finally showed up. In the mean time, I decided I didn't have time to mess with it and got it over to a restoration shop. The guy there hasn't looked at it yet. Depending on how it goes with this shop, I might keep the car or I might get rid of it.

 

Yep -- I wonder how the compression testing will go. Sadly, I fear that might tell you a lot.
Might be the prostate

 

Hi Robert,

I'm not an XJS expert; I have an '02 XJR. But, I'm just down the road if you need a beer and some sympathy. And maybe a little help with the Jag ...