Ok, so I guess it must be ignition and not trans??
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From: Pacific Northwest USA
I think going with coil replacement is the right move in this case.
I don't think a dead vacuum advance would cause the problem. By design its function is limited to part-throttle, high-vacuum situations.
A problem with the centrifugal advance might be another matter. I'll have to think some. I honestly don't know if lack of centrifugal advance would give the symptom described.
Cheers
DD
I don't think a dead vacuum advance would cause the problem. By design its function is limited to part-throttle, high-vacuum situations.
A problem with the centrifugal advance might be another matter. I'll have to think some. I honestly don't know if lack of centrifugal advance would give the symptom described.
Cheers
DD
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From: Illinois
I think going with coil replacement is the right move in this case.
I don't think a dead vacuum advance would cause the problem. By design its function is limited to part-throttle, high-vacuum situations.
A problem with the centrifugal advance might be another matter. I'll have to think some. I honestly don't know if lack of centrifugal advance would give the symptom described.
Cheers
DD
I don't think a dead vacuum advance would cause the problem. By design its function is limited to part-throttle, high-vacuum situations.
A problem with the centrifugal advance might be another matter. I'll have to think some. I honestly don't know if lack of centrifugal advance would give the symptom described.
Cheers
DD
Yeah, I guess I'll start there and see if it fixes it. It's a strange thing especially since it's making the trans shift at that point as well.
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From: France
That is because the pressure tails off and the thing thinks you have lifted your foot off.
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From: Illinois
Ahh... well it will be interesting. Hope it works
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Well I made a secondary coil today and hooked it up...same rpms about 4.5-5k. So it's not the coil. Would the trans governor not allow it to rev even if the trans is not engaged in drive? I'm guessing this is a timing issue?
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Course I did experiment with my old primary coil... I believe I need to get a new coil and just replace it as this person seemed to have the exact issue and it solved it...
https://www.jaguarforums.com/forum/xjs-x27-32/xj-s-rev-limiter-153911/page2/
https://www.jaguarforums.com/forum/xjs-x27-32/xj-s-rev-limiter-153911/page2/
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From: Pacific Northwest USA
No, the governor would not come into play unless the car is rolling along
Cheers
DD
Veteran Member
Joined: Mar 2008
Posts: 25,521
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From: Pacific Northwest USA
Course I did experiment with my old primary coil... I believe I need to get a new coil and just replace it as this person seemed to have the exact issue and it solved it...
https://www.jaguarforums.com/forum/x...-153911/page2/
https://www.jaguarforums.com/forum/x...-153911/page2/
Pull the distributor cap and give the rotor a twist and release. Does it snap back smartly? It should!
Cheers
DD
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From: Illinois
When I did everything last spring... the rotor didn't snap back. It twisted "X-amount" but didn't snap back. I lubed it up and it would twist fairly freely but no snap back.
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From: Adelaide Stralia
No short cuts with that little forgotten item I am afraid.
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I don't think it wanted to snap back... I'd move it and it seemed fairly loose, but I'd have to move it back myself. Bad or stretched springs? I ordered a single coil conversion in the mean time just to make sure it's not the spark.
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From: Adelaide Stralia
Maybe, cannot see from here, HA.
Many i have worked on have had damage in that area, due to "stupid" pulling the rotor off without thinking, and the top shaft has "popped" the plastic retainer, and risen to the cause, stretching the springs etc in the process.
Some report a screw in that centre hole, and I have only seen that on the PreHE and Carby V12 distributors, but the USA gets strange stuff, so maybe Lucas did you guys a favour. All mine had the plastic clip or remains of, and 3 are still running with a simple rubber o/ring over the tit, and common sense kicks in when removing the rotor for the annual lubrication.
If the springs are stretched, then you will need to find some replacements, NO idea where, but they will be out there somewhere. A V12 engine fire trashed car, will have springs, and I know there a few of them floating around the USA.
Many i have worked on have had damage in that area, due to "stupid" pulling the rotor off without thinking, and the top shaft has "popped" the plastic retainer, and risen to the cause, stretching the springs etc in the process.
Some report a screw in that centre hole, and I have only seen that on the PreHE and Carby V12 distributors, but the USA gets strange stuff, so maybe Lucas did you guys a favour. All mine had the plastic clip or remains of, and 3 are still running with a simple rubber o/ring over the tit, and common sense kicks in when removing the rotor for the annual lubrication.
If the springs are stretched, then you will need to find some replacements, NO idea where, but they will be out there somewhere. A V12 engine fire trashed car, will have springs, and I know there a few of them floating around the USA.
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From: Illinois
Maybe, cannot see from here, HA.
Many i have worked on have had damage in that area, due to "stupid" pulling the rotor off without thinking, and the top shaft has "popped" the plastic retainer, and risen to the cause, stretching the springs etc in the process.
Some report a screw in that centre hole, and I have only seen that on the PreHE and Carby V12 distributors, but the USA gets strange stuff, so maybe Lucas did you guys a favour. All mine had the plastic clip or remains of, and 3 are still running with a simple rubber o/ring over the tit, and common sense kicks in when removing the rotor for the annual lubrication.
If the springs are stretched, then you will need to find some replacements, NO idea where, but they will be out there somewhere. A V12 engine fire trashed car, will have springs, and I know there a few of them floating around the USA.
Many i have worked on have had damage in that area, due to "stupid" pulling the rotor off without thinking, and the top shaft has "popped" the plastic retainer, and risen to the cause, stretching the springs etc in the process.
Some report a screw in that centre hole, and I have only seen that on the PreHE and Carby V12 distributors, but the USA gets strange stuff, so maybe Lucas did you guys a favour. All mine had the plastic clip or remains of, and 3 are still running with a simple rubber o/ring over the tit, and common sense kicks in when removing the rotor for the annual lubrication.
If the springs are stretched, then you will need to find some replacements, NO idea where, but they will be out there somewhere. A V12 engine fire trashed car, will have springs, and I know there a few of them floating around the USA.
I remember having an absolutely horrible time getting the starwheel off and probably stretched everything to the brink of uselessness. Is the SnapBack just supposed to let you know it's lubed up good or is there a different reason? I'm hoping the new coil fixes the issue I don't want to go back in the distributor in the spring. I got bigger/better things to fix... like a none charging alternator. 😡
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From: Adelaide Stralia
The mechanical advance mechanism MUST return to zero, as designed. Without that taking place the engine simply will not run as designed.
As well as the "snap back" the "advance" movement as the revs rise, also needs to be smooth and non-binding, or the top end will suffer seriously.
As well as the "snap back" the "advance" movement as the revs rise, also needs to be smooth and non-binding, or the top end will suffer seriously.
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The mechanical advance mechanism MUST return to zero, as designed. Without that taking place the engine simply will not run as designed.
As well as the "snap back" the "advance" movement as the revs rise, also needs to be smooth and non-binding, or the top end will suffer seriously.
As well as the "snap back" the "advance" movement as the revs rise, also needs to be smooth and non-binding, or the top end will suffer seriously.
So the SnapBack happens because of the weights and springs in the advance? So it not doing that is probably a pretty good indicator that my advance is not working properly?
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From: Illinois
Well that and the vacuum advance both need to be repaired in spring. The vacuum advances surround is completely gone so has zero vacuum.
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From: Illinois
hmm forgot about that little part. I had replaced it but returned it at one point in my search for a no start(My magnetic pickup was bad). I could give the module a try and see if that works. I still have a feeling I "broke" the distributor advance since it won't snap back.