Michaelh
Many thanks for attachments, I will forward them on. My friend thought you had to remove throttle body. I have put up a picture of the crank sensor with no loom, I'm guessing if the fault was the loom then i would be no better off.

 

That sensor doesn't look to be correct It has a connector on the end and not the attached loom. It's this one, I think:
https://www.aliexpress.com/item/32810574051.html

Here's the SNG Barratt catalogue entry:
https://www.sngbarratt.com/English/#...60lca1640ae%60

I'm a tad suspicious of the packaging. I could be wrong, but every OEM item I've purchased has a green label with 'Jaguar' printed on it (even small items such as plastic fasteners, shim washers, etc.)

 

So I had car towed to a garage that was prepared to work on a "foreign" car. He took old sensors off and said both parts I ordered were wrong. Did the parts change 1996 - 2006? I'm sure I ordered the correct parts. I have owned the for 20 years and it hasn't had an engine change.
Parts I ordered were LCA1649AE and LCA1646AD.

 

Respectfully,,,, just because you've ordered the right parts doesn't mean they shipped the right ones. Usually, and still there can be issues, I look at a lot of photos and examples before I set out to do work and open the packaging sent by suppliers. Lots of times they have simply sent the wrong thing, to few or too many - like that...

In this market/world awy mechanic who is still jammed up by the idea of a car being foreign,,, well it would cause me pause...

 

Honestly, i must have phoned a dozen independant garages in the town where the car is and he was the only one who would touch an old Jaguar. It was a nightmare finding anyone.
He hasn't got the new new parts yet so lets wait and see what happens.

 

Garage ordered correct parts, one of the ones I had bought was not genuine but appears to have been made by intermotor (which doesn't come with wire.
Anyway he fitted both cam and crank sensors and it doesn't run any different.He says hard to start and runs badly. He thinks head gasket but i doubt it.
I am going to have to find someone else with better knowledge or just scrap the car. My expenditure is already going through the roof and from 4000 miles away it is proving difficult to arrange things.
Anyone got any further suggestions before I give up please?

 

1. Electrically check the wires of cam and crank sensors back to the ECM (i.e. rodents, etc). This should be straightforward if you have someone willing to do this. Diagram below (Pins on the ECM, EM13-20 and EM13-29 to the CMPS connector and pins EM13-19 and EM13-27 to the CKPS connector).
2. Check the timing chain/tensioners. Were the secondary tensioners updated on your car?
3. Check compression.

 

Further information..........He put a code reader on car and now it comes up with P1000 not P1336.
Any further ideas guys?

 

crbass, thanks for info. Just to ask, car was running perfectly when wife took it to shops. She parked for half an hour then went back to car and it ran like it was on 4 cylinders. Surely timing chain or tensioners would not go bad while parked. And compression would not be a problem with car running on to only 4 cylinders would it? Didn't think any gasket failure would cause that many cylinders to be down.
For full disclosure, wife said 4 cylinders but she may be out by one or two as it was difficult to tell.

 

Maybe you’ve fixed this, but P1336 is a code that needs 2 fails to set. So the codes may have just been reset.

P1000 is just all monitors not clear, not an issue for you right now.

Next ideas are 2 and 3 above.

 

Agreed, at first seems mysterious, but timing chain could have failed on start, for example. Have you updated the secondary tensioners?

There are scenarios for 1. and 3. also on start after using the car for a bit, but seems like the next step, if you wish to proceed, is to rule out a couple of these larger things. Depending on the shop, this may not cost a fortune to pull the cam covers and look, to run a compression test, or to check the wiring. A yes on any of these probably definitively chooses your next steps for you.

You could go down rabbit holes with fuel (maybe crap in the fuel lines constricting some portion of the fuel lines?) and/or spark, but having no other codes makes these more difficult to understand/troubleshoot.

 

So car went to Jaguar main dealer in Orlando and I had a report. This is the basics of what was in it...................We had to use an old Legacy scanner for your vehicle.

Only code was for crankshaft positioning sensor which was already replaced by another shop.

My technician doubled check sensor and its within Jaguar specs.

On start up ,this vehicle has a very rough idle and a slapping noise coming from front timing cover area.

Back in 97 and other years, they used plastic timing chain tensioners. Since then they have been replaced with metal style.

The plastic style didn’t last to long due to the oil and heat of engine.


Starting to make me now think the problem may be the tensioner not being changed from plastic. Would this cause theproblem and can it be fixed for a reasonable price?

 

A couple of members suggested checking the timing chains several weeks ago, but this hasn't been done yet?

 

Sounds like a secondary chain may have only skipped one tooth instead of two. I'd suggest that you don't start the car again until someone has taken a look under the cam covers.

If it is a failing tensioner and the chain skips another tooth, the car will have made the decision for you.

 

I second what Michael suggests. Hopefully you still have it in the shop and can have them pop off the cam covers and see if this is the source. If it is, there are a range of possibilities for damage from extremely lucky to 'need new engine'.

 

No because the fault code was initially reported as 1797 1798 1799 then someone else re did the diagnostic test and they said P1336. This was symptomatic of two sensors which i eventually had changed. Finding someone in Clermont Florida to even agree to look at the car was a nightmare. No one out there wants to work on "foreign imports of age".
I think tensioners is probably correct but it becomes irrelevant now as i sold the car yesterday to someone who is of course fully aware of the potential problems. He promised to let me know his findings and i will sure as heck post the results on here when i know. You have all been so helpful.
Thank you
Phil