I have currently been entrusted to get my father in laws 1992 jaguar xjs v12 running again he sent it to get the headliner and a few other cosmetic details buttoned up at a shop turns out they put it behind the shop and never fixed the problem....... Now there is an even bigger problem when he went to get the car from the shop 3 years later after getting the run around there was a giant rats nest in it thankfully they didn't eat to much wiring all that i can tell is a few injector wires and a wiring harness on what looks to be the coil does anyone know where to get this 4 wire harness at or what its even called specifically so I can look f or it better

 

a brief perusal of the jaguar parts catalog suggests that none of the engine wiring looms are still available new from jaguar so you'll probably have to find a used harness or more likely repair your existing harness since judging from your description the damage isn't too bad. some aftermarket suppliers offer a replacement injector harness but I'm not personally aware of any of them offering the coil harness most of use make our own fuel injection harnesses so I don't see why a coil harness couldn't be made up or repaired the main thing is whether or not the connector plugs are damaged as it can sometimes be difficult to find exact replacements

do you have a pic of the damage?

Cheers
DD

 

It does not sound like you're inclined to make your own harness, so I'd try calling the usual jag suppliers like SNGbarrat, Coventry West, etc (Look for the sponsor listings on this site)

Then theres always fleabay

To understand which wiring harness you need, go to Jaguar Heritage parts and search thru' the diagrams to find what its called

Jaguar XJS parts | Jaguar Heritage Parts UK

Usually rodent damage is worse than it looks, and the V12 is known for baking and frying its wires, so this could call for an unpleasant combo. Good luck

 

This is the wiring harness I hope the picture uploaded

 

I have new plug wires already

 

Jeez Doug, you through a period in there after the word "bad". You're slipping!

 

I was trying to make a bit of a point


Cheers
DD

 

Repairable.

But you'll need to spend some Google time finding a new connector. There are vendors selling a wide array of OEM style connectors and I'm 99% you can find a match for this coil connector. it is not Jaguar-specific.

Cheers
DD

 

I have looked everywhere and I can't seem to find the connector any where this is what it looks like

 

Looks like it might be a Metripack 150 type

Click here and scroll down a little to part #A1500SS-4

Metri-Pack Sealed 150 | Metri-Pack Automotive Electrical Connectors | Automotive Electric Connection

Cheers
DD

 

Another pic, different vendor

12162144, 150 SERIES SEALED FEMALE CONNECTORS, METRI-PACK 150 SERIES SEALED, DELPHI/PACKARD TERMINALS & CONNECTORS, CONNECTORS - Terminal Supply Company - Product Detail

Cheers
DD

 

I have them
let me see if I have a unused spare....
oh yes...
PM me your address


well it will not let me upload an image...
I have a bag of them...
you will have to crimp them together... on to your wires...


I will send two... you can mess one up learning...


let me know if you need two and I will send you three...

 

I got it rewired and it wouldn't run so I changed the fuel pump and filter got it running and now the idle is high and it is also revving up and down continuously I am stumped any help please

 

Great work getting the car going, congratulations. This problem is easy to fix. Your car as all V12 XJSs has a cold start device called an Extra Air Valve (also called an Auxiliary Air valve). Here is a diagram of it, part number 6:

Extra Air Valve-5.3 Litre - Parts For XJS from (V)139052 to (V)179736 | Jaguar Heritage Parts UK


It is located at the cabin end of the US driver's side inlet manifold, srewed to the block. When it sticks in the open position, the revs climb up, and if the throttles are closed, the ECU cuts the fuel when the revs get over 1500, because it assumes the car is on the overrun with closed throttle and cuts the injectors to save fuel. Then, when the revs drop, it starts the injectors again, and so the cycle repeats. The cure is a new AAV or repair the old one. Grant Francis has a great repair guide. New ones are about 200USD. Hose 3 on the diagram must be bought, as you will break it removing the AAV. The AAV is secured to the engine with TORX screws, so you need a Torx driver to remove them.
Greg

 

Turns out its not the aav i plugged the hole and the rpm isn't dropping enough to be the aav I adjusted the idle screw and the revving up and down stopped but it still has a high idle in between 11 and 14 sometimes even 16 or so

 

Any advice would be appreciated

 

Hi Ryan,

I have had this problem. It's, a vacuum leak for sure. It's an easy problem to have but not always easy to find.

You need to check every vacuum hose and make sure they are connected and not leaking. Also, check the PCV valve. I have accidentally disconnected one of those while working on the engine and did not realize it. Once reconnected the vacuum leak was gone.

Once you fix the vacuum leak the AAV can be adjusted and the engine will idle properly.

Mark

 

As Safari so rightly said Ryan, there is an air leak somewhere. If the AAV is plugged at the inlet to pipe 4 (in the diagram) in the air filter box, then it will be 100% blocked (the idle adjuster air feed will be blocked too). The other pipe attached to it if holed (3 in the diagram) and any hole in 4, will give air leaks. Also the throttle butterflies if out of adjustment, also check all the small pipes that attach to the inlet manifold at both ends of each, and any pipes emerging from the inside back of the airboxes (like the crankcase breather as Safari said, also underneath the A bank throttle body there is a large pipe connection. Also the brake servo vac takeoff at the top end of the A bank manifold cabin end could have a holed hose or a stuck open non return valve.


Greg

 

Actually Bill C, you may be slipping. Doug was simply not capitalizing the first word of sentences.
RagJag