Hi all,

I've looked over threads regarding this and will look into battery and pump once I'm back from work. However just 8-10 hours prior to the failure I moved the Jag from a place where it potentially can get damaged since we had a rather strong wind and rain yesterday (up to 30mph). And to me it's quite a coincidence since the car ran smoothly before that. Was parked for the night under a slight angle also if it matters (about 10-20 degrees maybe, sideways to the hill).

Anything specific you think I should look into? It's an XK 2009 we're talking about. Half a tank of fuel left.
Thanks in advance!

 

as the car was parked on a slope you may have pressed the brake pedal a bit harder than usual.
Try pressing the brake pedal harder than usual when trying to start the car . This is a known issue if the pedal sensors stick when using a lot of pressure on the pedal to stop. To release you have increase the pressure on the pedal.

There are threads re this problem on here.

 

Another possibility is that your fuel gauge is off and fuel level is much lower than indicated. Parking on a slope might expose fuel pickup.

 

Press the START button before you step on the brake pedal. If the brake pedal is really high, you may need to use both feet to depress it with all your strength. A high brake pedal can be caused by inadvertently stepping on the brake repeatedly.

 

Is there a fuel cutoff / inertia switch on this car? Strong winds rocked the car while at an angle.

 

If it cranks it has nothing to do with the brake switch. If you have an OBD reader check the fuel pressure and codes.

 

Hi lads. Thanks for all the replies. I tried pressing brakes harder, tried button first but it didn't do the job.
Tried removing the contact on the battery for 20 mins also (and had to figure out that there's a boot keyhole behind the number plate) to reset the computer, no effect.
There's half a tank of fuel for sure.

Bought a multimeter today, battery is 12.28V. Seems like below average, could that be the issue? Will try to charge it before replacing.
Will look into OBD reader, don't have one by hand.

 

Right, I need amps actually. Will try to find a way if that's battery. And then there's a long checklist of things.
Still odd though it happened during storm, such a fluke.

 

Resting battery voltage should be 12.6 or a bit higher. 12.2 is too low

 

How are your key fob ?

 

Any resolution on this?
You have left us most curious- if there is an inertia or anti-theft switch.

 

Charging the battery right now to see if that's the cause, will update once I find the cause. If battery is not the cause, it's defo part of the problem since it's 12.2V atm. Thinking now if that short ride I took at night to move the car from the gates to another spot could've drained a declining battery since there's no recharge.

 

get a maintainer

 

So I charged the battery to 13.1V, put it back but the engine still cranks and won't roar.
My plan is:
1. Check the spark first since there're no RPMs.
2. Check the fuel system:
2.1. Add starting pack if possible to see if that's the problem;
2.2. If it is check fuse first just in case and then fuel pressure if I manage to reach it.

And then go to service I assume if there's nothing I can do. However it'd be much nicer to solve the puzzle myself!
I assume though the battery still might be the cause, but I don't have equipment to check it further.

 

Here's also a small illustration if it helps:

 

Ah! I think I've got it!
I've just moved the car at night and that should've flooded the engine. Could that be the case? Any advice if so?

 

I dont think its flooded engine- you would have cleared it by now.
Besides, what caused it to flood?

 

They say if you just move the car slightly without giving it a few moments to run the engine next time the engine might be full of petrol. Especially when it comes to parking on a hill. Just like I did, makes too much sense.

However that's mostly for carb cars ofc, and it's a rare case in modern ones. Called the technician he confirmed it might be the case though.
But yeah, might be anything else too. Couldn't check sparks and fuel pump today, will do it during the week. If nothing will give up go to the service. Will post the root cause once I find it.

 

Even though you charged the battery, from the sound of your video while cranking my bet is that it's your battery. Although it now shows 13.1 volts, it might not have enough amperage to spin the starter motor fast enough in cold weather. Cold weather not only reduces battery performance dramatically but combined with cold and thick motor oil makes it even harder to start your car. Did you check the voltage again, after you tried to start it? Will it crank at all if you have the high-beam headlights on?

A load test will determine the health of your battery and if it should be replaced. There's more to a battery than just voltage.

 

Might as well still be the battery, I agree. But that I reckon I can check only in service once I give up.
1. Voltage atm is 12.64. Not sure if matters that the battery is back in the car that's outside.
2. Temperatures last week varied from +8 during daytime to 0 degrees Celsius in the night time.
3. Tried to start with full beams on, cranks in the same fashion.