Ok,Well I'm glad someone got something good out of this novel..lol
And I guess a good thing is I'm becoming a jag expert,
I now feel there is no task on these cars that scare's me anymore..lol
Anyways,So you think the whole time it may have been the start relay?
Amazing!Ok,what about discrepancies between ecu's?
I think I'll get the 16cu and eliminate that equation..
So when I'm cranking eng,the voltage should stay a constant 12v.
Ok I'll take relay off and clean it.
Also I noticed a blk/ with green tracer wire same color as the smaller blk/green wire hooked to st relay,it comes off the same harness that injector wires and wires from power resistor does.It comes out of harness right under st relay.It looks like a 14 gauge and the other wire looks to be 18 gauge.The both have the same kind of connector,that fits perfectly in st relay.Any Ideas??

 

You should have 5 wires on the relay. Two each end and one in the middle. I have just changed mine this afternoon as a precaution! have you got all five attached? if not I'll take a look at my colours tomorrow.

Greg

 

I have more than 5 wires attached.I have 8 wires.
As follows term numbers c1, c2, w1,c4, w2 each has 2 wires attached.
On my schematic it show 5 also.Those black with green wires one not attached to anything. the one that is attached.It say's it goes through nuetral saftey switch.
Here is what I have on relay: C2 brown 12 gauge size wire, (W2) yellow/wht, wht/blk,. (W1) Blk/Green, (C1)red 12 guage size wire, also the two wht/red wires.and (C4) 2 wht/blue wires.
Also,I was looking on line and found a site where,A guy used a fog lamp relay. Bosch #00332204150 and said they work better than the lucas and more dependable,and mount to same position.They are 12.00 compared to the 80.00 for lucas.
what do you think?

 

A lot of people use a "Chrysler" relay but I can never get a square answer on which wires go where as mine seems to have different wires attached then the internet descriptions indicate for the conversion.

 

Hey JT,This is bosch fog lamp relay.

Heres the site: Jaguar Specialties
theres a diagram and instructions.

 

Well,Praise God!,
I cleaned connectors on st relay,hooked up the one supposedly good ecu.
And it fired right up..Yaaa hoo!....all this time it must have been that st relay.
Go figure..
Thanks so much for the suggestion on that st relay Grant..Your a genius...
all you guys,Grant in the Great land down under.. Greg in france,Jt,DD, Katoh and all who helped with this long drawn out
thread...If it wasnt for you guys,I would have given up forsure.
I just hope this thread helps someone else in dire straights...
Ok,my excitement is calming down.What a rush..
Now I noticed it ran at high idle about 1800 rpm's I shut it off because I also noticed very little oil pressure.
I think it might be due to thinned oil due to petrol in oil,don'want to throw rod.I'm guessing ofcourse.
any ideas of high idle and only 10 psi oil pressure.??

 

Hooray Again!!!
Mate your shout! JD for grant , not sure what Greg drinks and some of the others, make mine a Jug of Carlton! It was thirsty work.
As far as Relays go a relay is a relay is a relay, If it has the same power rating it will work, but must be same power rating.
Ok lets start another book, this one didn't have enough pictures for me.

 

That's GREAT!!!!! Put in fresh oil ( these things run notoriously low on the gauge at idle, if they read at all) and let her warm up and see what the idle does, could be the AAV needs at tweek or the butterfly's need set, minor stuff to be sure.

 

Yeah, as I said, doesn't comply with the wires on any V-12 I've seen. That schematic shows four wires my relay has seven.

 

Ya, if all you guy's were closer,Drinks would be on me forsure..
You guy's are all awesome..
yep its wierd how mine has 8 wires on my st relay.And its not on my schematic either.Mine book shows 5 wires..
Now comes the tweeking,getting everything up to specs.
I'm hoping the Oil pressure will come up to where it was when it was running before.70%it had great oil pressure.
well it's off to parts place for 3 us gals oil.Do you think i should replace oil filter,since gas oil mix has been going through it?

 

Change it and don't use the " little" one you'll get from the local dept store or advance auto, go to NAPA and get the " larger" capacity oil filter.

 

If it was running high oil pressure before I'd call that a fluke. These things barely register anything at idle on the barrel gauge, when you give it gas it should come up but don't think it will act as most direct reading gauges because it won't. Low pressure at idle isn't a true view in theses cars of its actual pressure.

 

Ya,Thats what i did last time.I have napa here, I figured 20 50 castrol high milage oil.
Better start diving this car soon,before something else goes out.lol

 

These cars LOVE to be driven and DON'T baby the V-12, I drive mine like A rental car and my gas pedal have two settings, idle and WOT!

 

Trust me,I am going to get it on the freeway and reem it out.Cant wait..
It will be driven thats for sure..

 

HOO BLOODY RAH

Fair dinkum I do need a drink, or 2 or more.

GOOD news, really.

The 1800 is a tad high, but lets get it up to temp and work backwards from there.

 

As soon as I have walked the dogs and made the coffee, I look at the forum. Could not believe my eyes; TERRIFIC NEWS. CONGRATS, you never lost heart either. Drive the wheels off it as someone above said. Mine's a cognac if after 8pm, Burgundy before! But most importantly, buy yourself some large ones!

We look forward to the easy stuff now, high idle, tyre pressures, aircon, and so on. I changed out my starter relay yesterday, juts to be on the safe side, so you have helped us all. But DO buy a new one and fit it....

Congrats again. The Goddess of XJS deems you worthy!
Greg

 

NOTICE to the true acolytes of the XJS Goddess:

"Verily I say unto you; follow, mark, learn and inwardly digest the wisdom of the GREAT XJS PROPHET Grant Francis. Frame these wise words and hang them above your garage door so that all will know you are a TRUE FOLLOWER of the Goddess' CHOSEN ONE:"

"There is wire from pin C4/C1 of the starter relay to pin #26 of the ECU. It is White/Red, SAME as the starter solenoid wire from the same relay terminal, but smaller diameter. This wire TELLS the ECU to fire the injectors, AND start the fuel pump whilst the ign switch is in the START position.

Once the engine starts, the "start" position is de-activated, and the ignition pulse is sent down the coax wire from the amp, and takes over that "telling" to the ECU.

Its that simple."

Without you Grant, we are children in the darkness. Fantastic diagnosis.

Greg

 

MAAAAAAAATE.

It took me War and Peace to remember that damn wire.

I really MUST write my book before more stuffs fade forever.

OR drink less, NAH, write the book.

 

Thanks Greg,and I concur,with that statement..I do appreciate your wisdom too Greg..Like I said,if it wasn't for you guy's,sticking with it,I would have given up a long time ago.And Grant..your are the Master of jaguar diagnostics..No doubt..CHEERS!! to you..
I am truely appreciative.I only hope I can keep the beast running good.
I'm going to give here a good shot of Mobile one oil,and good tank of premium fuel...
When it started,I noticed the rpms were very high.I think cause I had the dist turned as far retarded as possable.Once I advanced it,the rpms came down to around 1100
Now its just tweeking the adjustments a bit,and then,the open road,to see what she can do..Hooo Wee ...can't wait.
I was so excited I could sleep last night..
I want a coppy of that book..Best seller.lol