Simon -
It sounds to me that your throttle switch has dirty/fouled contacts. I'd
pop the cover off the switch and then file the contact surfaces. I've never
had this particular switch apart, so I'm guessing it has contacts in it.
Either way, doing something like that will probably fix it.
Alan
'52 A90
'53 BN1
'64 BJ8
On 1/25/07, Simon Lachlan <simon.lachlan@homecall.co.uk> wrote:
>
> I really have to thank you all for your help and advice in getting my
> overdrive fixed and my car back on the road.
>
> Special thanks for those who sent spreadsheets, articles and charts.
> Feedback on/from those will either be forthcoming or should be elicited if
> nothing materializes.
>
>
>
> I could stop there and leave you all in suspense, but that would hardly be
> sporting. You all remember the symptoms and how I havered around blaming
> the
> throttle switch. You should know that I've had problems in this area
> before
> and have done a devil of a lot of research and taken these devices apart
> until I know the circuitry backwards. Hence the appeals on specifics such
> as
> "what does a throttle switch do when it's failing?", by which I meant
> "what
> falls apart?", not "what happens (elsewhere in the system[!]) when it
> fails?". There is a subtle, but important, difference.
>
> I took the dash switch off and tested it to my complete satisfaction. I
> did
> the same with the relay and got current and continuity when and where I
> should. I was less happy with the throttle switch, which tested OK, but
> would never quite yield the magic "zero to one fifth throttle" adjustment
> which the manual brags about. But, the ***** thing looked fine with no
> apparent wear or slop in the bushes or curvature in the spring or wear on
> the points etcetc.
>
> After, seemingly, dozens of fiddles and tests and adjustments I've got it
> working again. The throttle switch remains very trigger happy however and
> my
> "one fifth" remains a chimera. I'm off on holiday tomorrow and won't be
> back
> for 10 days or so. Anyhow, the weather is mostly foul and doesn't lend
> itself to rewarding "test runs" down to the pub. So, I'll bide a while and
> try again in a week or two.
>
> What do I really think? The throttle switch is worn out and, with huge
> patience and more luck than judgment, has been corralled into one last
> effort. The relay isn't far behind and the interplay between these two
> forty
> something year old performers is giving rise to the problems that I've
> been
> experiencing. Replace the switch then the relay would probably do it. Note
> "probably".
>
> The advice to by pass the throttle switch is tempting, but it doesn't
> resolve the question does it? Being Irish, I could say that the by pass
> answers a question, but is it the question that one should have asked in
> the
> first place?
>
>
>
> And thanks again for all your time and trouble,
>
> Simon.
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