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David Michael Leedy
Experienced User
Username: dleedy

Post Number: 32
Registered: 11-2011
Posted on Tuesday, 29 March, 2016 - 07:03:   Edit PostDelete PostView Post/Check IP

Hello Folks,

Once again my Shadow is giving me some annoyance...Fist I am happy to report that my 75 Silver Shadow daily driver has had it's transmission leak resolved with a new pan gasket and filters...On that note, however, the car still shakes a bit at idle and at stop lights....Although an optional feature in newer cars is a messaging seat...I don't think that was offered in '75....Other thing driving me a bit bananas is the "coolant" warning light..When you start the car, the brake light warning and coolant lights light, and eventually the brake warnings dissipate, but lately, it continues to stay on...I checked the the coolant in the engine and it is filled and when you do get moving, the light goes off....As soon as you slow down for a yellow or red light, there it is again....Any suggestions or have others experienced same and if so, what to do?
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Christian S. Hansen
Prolific User
Username: enquiring_mind

Post Number: 166
Registered: 4-2015
Posted on Tuesday, 29 March, 2016 - 11:34:   Edit PostDelete PostView Post/Check IP

My money, or rather what little is left, would say that the problem is with the sender unit. Test accordingly.
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Mark Herbstreit
Prolific User
Username: mark_herbstreit

Post Number: 146
Registered: 5-2005
Posted on Tuesday, 29 March, 2016 - 14:12:   Edit PostDelete PostView Post/Check IP

Loose baffle moving and shorting in the header tank?
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Brian Vogel
Grand Master
Username: guyslp

Post Number: 1855
Registered: 6-2009
Posted on Tuesday, 29 March, 2016 - 14:18:   Edit PostDelete PostView Post/Check IP

I can't say that I definitively know what is causing your coolant light to illuminate, but a very frequent problem is that components in the low coolant amplifier have gone (or are going) bad and it needs to be refurbished.

See the article I wrote about this as part of your deliberations.

Brian
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John Kilkenny
Prolific User
Username: john_kilkenny

Post Number: 232
Registered: 6-2005
Posted on Tuesday, 29 March, 2016 - 17:13:   Edit PostDelete PostView Post/Check IP

1. The car should not shake at idle. Idle revs and/or timing may need adjustment.
2. Brake warning lights should go out withing two or three seconds after starting. Any longer and the hydraulic system should be checked.
3. If the coolant light comes on when stopping or changing direction it is usually due to water movement. Add some more coolant and see if it makes a difference.
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Lungmuss
Unregistered guest
Posted From: 92.7.13.233
Posted on Saturday, 02 April, 2016 - 18:44:   Edit PostDelete PostView Post/Check IP

Hello David,
I had a similar problem on a RR Silver Spirit with undue vibration when standing. Tried all the usual, new plugs, ignition leads, timing, even petrol filters with no success. A friend then suggested check the distributor cap as it was probably the original. So before buying a new one I had a look at it and noticed a darkish discolouration around the inside which when scraped off revealed a clean surface underneath. Scraping this off was not very efficient so I looked for a cleaning agent. I used alloy wheel cleaner, gave the inside a good spray left it for a few minutes then cleaned it out with carburettor cleaner then dryed it with a hair dryer. The result was a clean dis. cap and the poor tickover has gone.
Thought this might help if you have not had any success. Regards, Clive

(Message approved by david_gore)
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Vladimir Ivanovich Kirillov
Grand Master
Username: soviet

Post Number: 450
Registered: 2-2013
Posted on Sunday, 03 April, 2016 - 22:58:   Edit PostDelete PostView Post/Check IP

David give your car a thorough tuneup including ohms checking all your ignition leads. Driving it the way it is can lead to insanity especially in NJ traffic. If that does not cure the rough idling then take the car to Ultratune and they will perform an occiliscope check. If it passes that check you have a fuel problem possibly caused by a vacuum leak somewhere. Avoid ethanol mixture fuel like you would avoid the plague. Please post the offending gremlin when you locate it.
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David Michael Leedy
Experienced User
Username: dleedy

Post Number: 33
Registered: 11-2011
Posted on Monday, 04 April, 2016 - 00:04:   Edit PostDelete PostView Post/Check IP

Hello:

Thanks so much for the suggestions...The glowing coolant light is no longer an issue...Just topped it off with some coolant and poof that problem resolved..Also the brake like illuminating a couple extra seconds was also resolved by addinf a small amount of rr363. I will try the suggestion of cleaning the distributer cap and perhaps change it and the rotor..Before spending on a full blown tune-up....Would an aftermarket cap and rotor be better than cleaning up old (possibly original) one and if replacement is better, what is a good replacement brand that would be direct fit? I researched and saw some older Jags have interchangeable parts with RR? Thanks in advance....
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richard george yeaman
Grand Master
Username: richyrich

Post Number: 479
Registered: 4-2012
Posted on Monday, 04 April, 2016 - 02:44:   Edit PostDelete PostView Post/Check IP

Hi David in the past I have used after market distributor caps and I found them to be little better than rubbish I fitted a genuine cap and rotor arm and a new set of leads ( MAGIC )

Richard.
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michael vass
Prolific User
Username: mikebentleyturbo2

Post Number: 120
Registered: 7-2015
Posted on Monday, 04 April, 2016 - 04:45:   Edit PostDelete PostView Post/Check IP

Hi David
I have fitted rover v8 (p6 I think)dizzy caps and had no problems but much cheaper.
The dizzy is Lucas so just take a pattern.
Cheers
Mike

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