XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Thanks for the V12 suddenly not starting

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Old Nov 6, 2020 | 07:23 AM
  #41  
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I suggest,

ALCOHOL, lots of it.

Compressor out of the way
Cruise out f the way,
Distributor cap and leads out of the way.

A clean work space for that loom is just so much easier than push and shove, and break some other thing.
 
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Old Nov 6, 2020 | 07:42 AM
  #42  
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Default Opening up V12

Thanks Again Grant!! I figured I would have to receive the full baptism by fire since 1st serious issues with this vehicle after 34 years. So I'll start with taking pics for memory, removing cruise control, then compressor, then distributor in that order to expose V unless you advise otherwise. I'm sure I need to be rather careful in there.
 
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Old Nov 6, 2020 | 08:42 AM
  #43  
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Originally Posted by DT T
Thanks Again Grant!! I figured I would have to receive the full baptism by fire since 1st serious issues with this vehicle after 34 years. So I'll start with taking pics for memory, removing cruise control, then compressor, then distributor in that order to expose V unless you advise otherwise. I'm sure I need to be rather careful in there.
I would leave the distributor in place. It is tricky to get it back exactly in the same position as it was. You can clean round it once everything else is off. and also service the internals with it in place quite easily. The throttle capstan and the tower it sits on should be removed, then you can get to everything pretty easily.
 
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Old Nov 6, 2020 | 08:59 AM
  #44  
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Since he has an 87, and should have a Lucas distributor, he may have to pull it to get to the advance mechanism to free it up as well as the vacuum advance unit if it is bad. Plus, the o-ring seal on the distributor base is a common leak point. If he marks where to rotor is pointing as well as the three bolts holding it down, he shouldn't have a hard time getting it back in place. He will need to do a timing light check of the advance though.
 
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Old Nov 6, 2020 | 10:12 AM
  #45  
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Default Thank you all for distributor information!

Wow I was afraid it was only going to get better lol. Well I'm a newby but up for any challenge cause this car is worth it to me. I'll hold off on distrbutor removal until I remove cruise and compressor. Glad I purchased the ROM but certain I'll be asking dumb questions soon.
 
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Old Nov 6, 2020 | 10:45 AM
  #46  
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Originally Posted by jal1234
Since he has an 87, and should have a Lucas distributor, he may have to pull it to get to the advance mechanism to free it up as well as the vacuum advance unit if it is bad. Plus, the o-ring seal on the distributor base is a common leak point. If he marks where to rotor is pointing as well as the three bolts holding it down, he shouldn't have a hard time getting it back in place. He will need to do a timing light check of the advance though.
You can do all the dizzy servicing of the Lucas dizzy with the unit in place, including the freeing off etc etc. I have found that it is not at all straightforward to get it back exactly in position, but I am willing to accept others can!
 
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Old Nov 6, 2020 | 12:43 PM
  #47  
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Default Great info Greg. Thanks!

Thank you Greg! I will definitely work around distributor as only see harness covering chewed open a bit but wires look ok, but clearly need to get in there to really see what's going on.
 
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Old Nov 6, 2020 | 07:57 PM
  #48  
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Leave the dizzy as is, until "push becomes shove"

Have a read of the attachments.
 
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Old Nov 6, 2020 | 09:16 PM
  #49  
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Default Great information Grant!

Thanks for the distributor downloads! I like the "when push comes to shove" philosophy on the dizzy after a first read. Already unbolted/unconnected cruise control so I can now figure out bolts to remove as well as removing belt off AC compressor so it can be moved/propped up in front I assume.
 
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Old Nov 11, 2020 | 02:23 PM
  #50  
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Default Found the no start problem!

Well I removed the cruise control out of the way and began finding clamps down in the V to remove the injector harness. Had to snip it off a lot to get it all out. As I was in the V a small blue plug attached to another blue plug near the bottom of the distributor was chewed completely through. Just two small rubbery wires between the two blue plugs I think all connecting to the Lucas (Bosch) EFI bolted on top. I am assuming I need to order an entire EFI kit at this point. I already have a new injector harness to clamp onto the fuel rails but clearly I found the true no start culprit thankfully. Any help as to ordering those weird blue plugs on the end of EFI loom would be great help.
 
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Old Nov 11, 2020 | 03:55 PM
  #51  
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Default Pics of EFI Amplifier/ odd small wire

Pics of EFI amplifier to which I'm referring. Anyone know reason for the small wire from wider loom off of amplifier?

 
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Old Nov 11, 2020 | 08:53 PM
  #52  
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Default Think I found amplifier to distributor harness #

I believe it is the small harness between EFI amplifier and distributer part # DAC 3247 that I need to order. I'll try SNG Barratt.. any other links to Jag parts would be very appreciated!
 
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Old Nov 11, 2020 | 09:40 PM
  #53  
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That Black Box with the Lucas sticker is the Ignition Amp, nothing to do with the EFI system at all.

The "Whitish" wire, going into that Black covering, is the lead for the dreaded shielded wire, I THINK, its been a while.

There is a small loom, 2 wires, that goes "Distributor to that Amp". Some are shielded, some are not. That is the section that generally gets chewed, and then there has been reports, mine was one, where those 2 wires actually broke inside the rubber bung of the distributor casing, took weeks to find.

I made my own as needed.
 
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Old Nov 12, 2020 | 12:09 AM
  #54  
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The distributor has a bit inside it called the pickup or base plate. This is the part:

https://www.britishparts.co.uk/class...ase-plate-p363
the blue rubber plug you see on the end of the loom exits the dizzy at the bottom and is the plug that joins the similar plug coming down from the amplifier. As Grant said, you can repair the plug/loom with any suitable plug, and no need to change the pickup as long as the wires exiting the bottom of the dizzy are OK.
The distributor base plate (in conjunction with the 12 point star wheel affixed to the distributor spindle) provides the signal to the amplifier to trigger the coil and produce a spark.

The thin white wire in your photo joining the loom via that black connector is indeed, as Grant said, the wire that goes to the ECU in the boot and tells the ECU (I think) that the engine is running so to keep the injectors going. If it is disconnected or broken the engine will not run.
 

Last edited by Greg in France; Nov 12, 2020 at 12:19 AM.
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Old Nov 12, 2020 | 04:34 AM
  #55  
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Default Thanks Grant and Greg!!

That's really helpful learning the wiring down there (and the correct part names). Wires from dizzy looked ok at first glance chewed between two small blue plugs. I haven't done an electrical wiring repair in SO long but if you have any steps, materials to order, advice, how to sites etc I would like to avoid a $200 bill for DAC 3247. Plus wiring seems to be a necessary skill as these beauties age regardless. That small wire to ECU looks good, just a weird configuration to me that's stronger than it looks. Ill fix the 2 chewed thru "rubbery" wires and detail V before I install new harness. I am planning on plugging new harness in first and check 12v on every connector before snapping them on injectors if that isn't overly cautious. I plan on using a Simple Green/Eco all purpose cleaner to carefully clean grime/grease down there and throughout the engine to detail. Any other suggestions/care products always welcome. Thanks again!
 
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Old Nov 12, 2020 | 09:14 AM
  #56  
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To repair the dizzy to amp wires, i would used these:
Amazon Amazon
Amazon Amazon
You bare the wires ends, slide a tube down one, then slip a solid cover on. Then twist the wires together, slide the solder tube up to the join so the solder circle is over the twisted together-ends, then blast it with a heat gun until you see the solder run a bit. Then slide the solid cover over that inner tube and heat again to shrink on the cover. Job done.
The new harness will be fine, no need to worry!
Clean the V and anything else on the engine with white spirit, or 100% alcohol. Something that will evaporate and NEVER anything water based!
 
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Old Nov 12, 2020 | 11:49 AM
  #57  
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Default That's fantastic Greg! Thank you!

That's awesome Greg! I am looking forward to tackling this now. Im sure i will have more questions but this is really motivating now. I also appreciate your advice on no water based cleaners!!
 

Last edited by DT T; Nov 12, 2020 at 11:49 AM. Reason: Spelling
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Old Nov 19, 2020 | 06:38 PM
  #58  
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Default Distributor base plate (pickup coil)

Don't think I'll be able to repair two wires as one of the two protruding wires from 1st blue plug coming from under distributor is eaten clean to the plug and other wire has maybe 1/4 inch left so not much to work with. I found the distributor base plate or partsgeek calling it base pickup coil for $145 if that sounds reasonable. The site from Greg doesn't ship to US which seems odd. Possibly online issues? Any chance there's a way to replace part without full dizzy removal? I have read the need to recondition every 15 years anyway so I'm due...but SO new to repairs but certainly not overwhelmed anymore thanks to you guys!
 
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Old Nov 19, 2020 | 11:25 PM
  #59  
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Sounds reasonable to me, BUT, I have never purchased one.

I ran 2 new wires to the pick up coil, soldered CAREFULLY, out through the base hole, leaving some slack inside the unit, and ran them direct to the Amp, which on my car is out the front of the radiator, no intermediate plug etc.

Filled the base hole with RTV, a SMALL amount at a time, let it dry, apply some more, lost the beer count, never mind.

It would be possible insitu, fiddly for sure, but certainly doable.
 
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Old Nov 20, 2020 | 12:11 AM
  #60  
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Originally Posted by DT T
partsgeek calling it base pickup coil for $145 if that sounds reasonable. The site from Greg doesn't ship to US which seems odd. Possibly online issues? Any chance there's a way to replace part without full dizzy removal?
Yes, I've done it. But, so long ago the exact details are forgotten

After removing the dizzy cap, off comes the rotor, and then a plastic shield. You'll then see the pick-up.

The reluctor wheel has to come off before the pick can be removed. I seem to recall a roll pin that needs to be drifted out. That's where my memory is fuzzy. In any case I think it'll all be self-evident when you take a good look.

Oh....one more thing. If the ignition rotor does not come off easily do NOT yank upwards with any force....which will damage the innards residing out of sight below the base plate. Use Dremel tool or something to slice the rotor. Might wanna order a new rotor at the same time to place it safe

Cheers
DD
 
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