Well, I am getting closer. I followed the advice of checking all the connectors and while nothing appeared loose, the engine is running slightly better. i don't have misfires on the cylinders any more, but now I have P0087 (low pressure on the high pressure fuel rail). So, I am suspecting that I most likely have coolant in the sensor and that is causing it to short out. I know I am getting close as the car will now start on its own (only have to push the button and it will come up to idle where before I had to step on the gas pedal to get it to come up to idle and I am able to run the engine longer before I get a flashing CEL).

So, now my question is how to access the high pressure fuel rail pressure sensor. I know it is on the right hand side of the engine, back near the fire wall. But, there is a coolant pipe (where the coolant most likely got dumped on the sensor from when the shop bleed the system of air) that would appear to be directly over the sensor. How do you access the sensor? Do I need to go in through the wheel well? I think if I can get the plug off, clean up the plug, I may be on the home stretch. Any help you can offer would be greatly appreciated.

 

I hope you get your water pump fixed and that it did not ruin your vacation at Gulf Shores. We love that place!

 

Especially Royal Reds and Louisiana Lagniappe

 

Trent it did not necessarily ruin the vacation (I had other family there, so, getting around was not really hampered), but it was more just the fact that the shop messed up the car and now I am having to undo whatever they did. Having the P0087 code, I thought they may have soaked the fuel pressure sensor when they vented the coolant system. But, I just replaced the fuel pressure sensor and that did not seem to fix it (granted, does seem to make the car run a little better than what it has been, but still not great and still a flashing CEL). So, on to replacing the fuel pumps. Parts ordered and hopefully by this weekend, it will be back to purring. Granted, I will be taking this time to do a plug change since I have a lot of the parts off already and I have been putting it off for some time now.

For those following this, I am slowly getting things back to where they should be. Not running 100% by any means. But, after a push on a lot of plugs, this seems to have helped the car some. Granted, I still think I don't have the correct fuel rail pressure which is leading to an extremely rich condition. Initially I had misfires on all 4 cylinders on the left side of the engine (P0302, P0304, P0306, and P0308) along with an assortment of other codes, predominantly the P0087 (bad fuel rail pressure, which would explain all the other codes I was seeing). So, after some playing and replacing the fuel pressure sensor, now I am getting P0304, P0306, P1316, P0300, and P0087. Most of these I think are symptoms of the P0087 code. So, since I just replaced the pressure sensor, this brings me around to replacing the high pressure fuel pumps. Where they are on the motor should be a fairly easy replacement. if someone has some advise, I am all ears at this point. I know I am going to loose some oil during this, so, ready for that. But if there is some trick, please pass along. At this point, getting a little frustrated and just wanting the car fixed. Granted, part of me is wondering if I may have fouled a plug or two, leading to a continuing issue. But, plug change is coming, so, that question is going to get answered here shortly before the new pumps arrive.

 

 

I don't know why you're laughing. It's entirely possible.

 

Nothing like the 12. I have 2012 XJL Caviar with beige seats dark roping. Nothing like the 8 cylinder growl

 

I agree!! That's the one thing I miss the most about our late, great, '12 XJ-L...............Damn the old geezer that ran into it!!

 

Are you going to drain oil before pulling the high pressure injectors? I didn't see where you checked fuel rail pressure and found it low (I'm sure it's there & I probably did read it, but don't recall). Those injectors aren't cheap
$360 each at Rock Auto:
2012 JAGUAR XJ 5.0L V8 Fuel Pump | RockAuto
& it isn't THAT easy of a job, so I imagine you might be isolating to one suspected pump, although since you're down there it, it may be worth replacing both if it's worth the additional $360 to you.
Or actually, with a 5% discount code they usually send to returning customers, it's $342 each.

But what IS easy, is draining the oil, then returning it after you're done.
Otherwise, it gets a little messy.
When I replaced my vacuum pump seal, I found that it's easier to drain at least a couple quarts out before removing the pump, then returning it.

 

12jag, I was figuring I would drain out about 5 quarts of oil to a container to add back in after I was done. heard you loose about 3-4 quarts as part of the work. So, got that covered.

As for the pumps, RockAuto had the pumps for my car for $170 each. I ordered 2 as I figured if one is toast, the other isn't too far behind. Granted, when I got the one, it had been josseled around inside the box that it broke the connector. So, having to send it back. Unfortunately, I bought the last 2 they had. So, ended up getting a new pump off of e-bay. Gotta wait until Friday for it to show up. Grrrrrrrr. Out of curiousity, what makes replacing the pumps so difficult. From looking at pictures, it should be nothing more than dropping the bottom pan (easy) and then reaching in near the motor mounts. Or, is there just so much subframe in that area that you don't have room for anything?

As for the fuel rail, I got the P0087 code which is saying that either the sensor is bad or the fuel pumps are toast. I replaced the sensor and the problem continues, so, it is looking like one of the pumps got some coolant in it during the pump replacement. Where would you measure it at? I am sure I would need a special gauge as the pressure from what I read goes up to a few thousand pounds. I did connect up my ELM unit through Torque and it was saying that it couldn't obtain a reading.

 

Well, here is an update. I finally broke down and took it to a shop to have them look over the car. As I suspected, atleast one of the fuel injectors is failed. So, 8 new injectors are coming. Hopefully this will get Jackie back on the road. I somewhat figured this was the likely cause for what I was all seeing. But, this leads me to think, is there a possibility that somehow during a water pump replacement a fuel injector could have been damaged. The car was running fine going into the shop and at some point during the repair, a fuel injector failed. Coincidence? I am having the repair shop see if they can spot anything. I am just a little suspicious about the timing of everything. Any thoughts?

 

Hi Thermo,

Having just changed my water pump I really can’t see how one could possibly damage a fuel injector in that process…

 

thierry, I agree. The only way I could really come up with was they removed the fuel line running across the top of the engine that feeds fuel to the Bank 2 injectors (which happens to be the side with the failed injector). So, if they got something in that line, then possibly. Just a very strange coincidence to have 2 major failures like this essentially one on top of the other.

 

Agree with thierry_1500. The water pump is a long ways from the injectors. So it's a long shot but they were working on the engine and we don't know everything they did during that repair.
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.
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Well, finally got the car back. 8 new injectors and the kitty is purring again. The mechanic could not see anything that was obviously wrong with the injectors. Guess I just had bad luck. A water pump fail as it took out a fuel pressure sensor/fuel pump, leading to a fuel injector failing. That was an expensive bit to get the car back to 100%. But, things should be good for awhile. Now to put a bit more work into the car to replace things that I was intending to do during this last 2 months (new pads and rotors all the way around and repairing the sun shields by replacing the drive motor for the sunroof).

 

What is the name of the plastic piece that is connected to the cooling system that run inside the oil cooler manifold

 

This, being your first & introductory post should probably include at least identifying what year and engine you have.
Otherwise, you could try reading through the many existing posts that already describe what ever specific part you're generally asking about.