The most likley problem is the cause is the overdrive relay on the firewall.
The circuit is being held in by the kick down until you get on the throttle.
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David Nock
NEW E-mail Addresses!!!
David Nock, Technical Questions healeydoc@sbcglobal.net
Sheila Nock-Huggins, Parts Questions britishcardoc@sbcglobal.net
British Car Specialists 2060 N. Wilson Way Stockton CA 95205
Phone 209-948-8767 fax 209-948-1030
http://www.britishcarspecialists.com
on 6/1/04 10:57 PM, Simonlachlan@aol.com at Simonlachlan@aol.com wrote:
> I'm trying this again in view of the past few days' silence.....
>
> You will recall my email concerning my BT7's new habit of jumping out of
> overdrive...
> ""One for the gurus....
> Background first:-
> I have all new overdrive mechanicals which worked fine until just recently.
> I have a 28% ratio o/d unit.
> Plenty of good clean oil in gearbox, first thing I checked.
> Overdrive on/off switch is new and works fine.
> Switch on gearlever is not new but works fine.
> I have not messed around with carbs or related linkage.
> Solenoid sounds healthy and engages overdive firmly.
> (I have a 3:54 diff, so the revs may seem a little low to you, especially
> coupled to a 28% o/d)
>
> So, the symptoms
> If I am driving along at about 1,900revs with my car in overdrive/4th,
> she'll jump out of overdrive if I raise the revs/speed with the accelerator.
> If I then decelerate back to 1,900 (+/-) she'll pop back into overdrive."
> The car has been off the road while some work was done on the instruments,
> so i could not provide feedback re. the many and excellent mails I received.
> So it was circumstance, not idleness....
> Well, I've done the obvious first thing and bridged the throttle switch on
> the bulkhead. The symptoms vanish. Where would I go now...? ....must the
> fault
> be in the throttle switch? First logic says yes, but how can the throttle
> switch disengage the unit while the relay is working?
> But, if the relay isn't working, how does it ever switch on in the first
> place?????????
> Simon.
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