As the title says guys my xkr wont start. Car has been off the road for a long time but when it came to me was running ok. Ive been working through it and recently changed the oil and filter. Run ok after that. Left it for a week or so and now she wont start. Did a hard reset of the battery and now its showing failsafe mode and gearbox temperature high. Car hasnt been driven so temperature cant be high. Cranks and turns over no problem. Any help greatly appreciated.

 

I'm sure you already know the answer to this - your battery is either flat and needs to be charged, or is dead and needs to be replaced.

Get your battery sorted out and try again.

 

Battery showed full on trickle charger and engine seemed to turn over ok. Didnt suspect battery.

 

Everyone else thinks it's the battery.

 

1) What is the battery voltage with engine off and it’s been sitting overnight or longer (not on a tender or charger either) ?

2) then, what is the battery voltage when the key is turned to the on (#2) position, but not on to the starting / cranking position.

knowing these values will help to give better advice. imho.

Z

 

I will try the battery off the other car tomorrow. I hope you are right. Wasnt disagreeing just saying that i hadnt considered the battery. Thanks for the help.

 

Aye.

 

Checked battery this morning after it had been on tender and showed 12.58v. Turned key to ignition lights on and 12.3v.
still not starting??

 

my jaguar was leaking coolant from the cross pipe, replaced that in the water pump. Nothing wrong with the water pump just had to plastic fin none broken, but I replaced them with a metal one after I did that the vehicle would not start getting codes that it won’t communicate with the ECM or the TCM had the battery charged up to 12.5 still crank no start
I’ve checked all fuses and many relays, and if anyone has any fuse box diagrams, that would be much appreciated. Mine in the trunk doesn’t have the diagrams that I’m seeing online any ideas would be much appreciated.

 

look in the “sticky” section at the top of the page. I don’t see the fuse diagram for your year , but this might be the same:
https://www.jaguarforums.com/forum/x...8-r-faq-33555/

there’s so much information in the sticky’s, you just have to jump in. Try the electrical section ….

Z

 

As a XK8 owner you have to learn one thing; The answer to ALL problems will always be BATTERY.
(No it is not but many members of this forum will tell you so)
Heard a knock at high RPM! Bad rod bearings? No, you just need a new battery

 

Here are a few codes i got

 

I replaced the cross pipe and the water pump. It ran fine. I did that, and it never started again.

 

Well when you have strange problems like the car won't start and the gearbox temperature is too high on a stone cold engine, then the first place to start is the battery. Random electrical problems are usually related to the electrics. A battery that has enough voltage to crank the engine, might not have enough to power the electronics, leading to all sorts of issues.

To the OP, if you are sure the battery is good, the next thing to check is the connection from the battery, through the high power protection module and the earth strap under the car. Also check to see if your instrument pack is in the faulty VIN range:-

http://jagrepair.com/images/TSB/XJ/4...%20failure.pdf

 

I would check all the fuses and make sure it's correct amps
Sometimes if you use higher amp fuse in low amp place it will show many msg on the dash .
And cleaning the throttle body also spray the maf with maf cleaner , the biggest issue here is the transmission make sure if you're using the correct fluid also check if it's full or low fluid . In worst cases I think it's the transmission harness itself inside the transmission but don't throw parts until you make sure what part exactly need to be replaced.

 

Just to close my original post. I have my car up and running again. The problem was nothing to do with the battery it was borewash. So dont go jumping to conclusions.

 

Are you suggesting that borewash caused a gearbox temp warning, and the other codes you posted?

 

I've no idea. I just posted as much information as I had at the time in the hope more knowledgeable members might be able to help. It wouldn't start and I got those messages. Didn't have them before and haven't got them now. I tried another battery but it still wouldn't start. Just saying it wasn't the battery.

 

for those who have never had to deal with bore wash, how did you proceed when it occurred ?

Z

 

Well firstly let me say I'm no expert and took advice from a few sources on the web. So here goes.
I removed the air filter housing and the pipe to the throttle body and then the spark plug covers . I removed the coil packs on that side and cleaned things up around the plugs with compressed air before removing them. Removed the plugs on the other side in a similar fashion. I then used a large syringe with some tubing on that was long enough to reach into the spark plug holes but leave the syringe in a comfortable position. I measured off how much engine oil was enough to fill a teaspoon. I then gave all 8 cylinders around a teaspoon full from the syringe. Then I reassembled everything but left the coilpack covers off. I had made sure the battery was fully charged previously. I then did a hard reset of the battery, I don't know if this was necessary but figured it wouldn't hurt.
After connecting the battery i got into the car.
Holding the throttle peddle all the way to the floor, I put the key in the ignition. I then cranked the engine for around 15 to 20 seconds before stopping. I then gave it a rest for around 15 to 20 seconds. At no point did i release the throttle from the floor. I then spun it over again. Same 15 to 20 seconds. Gave it another rest, still having held the throttle to the floor the whole time. On the third time of cranking after only a few seconds i slowly let the throttle upto around half way. As the throttle came up she fired up straight away. I left the car running for around 20 minutes and much of the smoke generated from the oil in the bores had dissapeared. Making sure the temperature was upto normal I turned her off.
I did notice a change in engine tone pretty much straight away on the first crank and she may well have started without the need for a second crank but After stripping everything off I decided to be on the safe side.
As stated I'm no expert and this might not be the correct way to do things but it worked for me.
I hope this is of help to someone as I have received a great deal of help from forum members in the past for which I am grateful.👍