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Idling speed

Daisy
Posts: 1
Joined: Tue May 07, 2019 6:03 pm
Location: Fakenham, Norfolk

Idling speed

Post by Daisy »

Conquest century idling speed too fast running at 2,500 what could be the cause?

Big Col
Posts: 469
Joined: Tue Feb 16, 2016 12:45 pm
Location: Leeds

Re: Idling speed

Post by Big Col »

If you haven’t been tampering with anything then I would suspect a sticking throttle or choke, linkage, cable, lever or the like.
Colin,
I may be slow but I’m rough as well !

pekkak
Posts: 27
Joined: Fri May 13, 2016 7:26 am
Location: Espoo, Suomi - Finland

Re: Idling speed

Post by pekkak »

:idea: How about the throttle returning spring ? :)

Phillmore
Posts: 847
Joined: Sat Feb 13, 2016 1:25 pm
Location: Worcestershire Herefordshire border

Re: Idling speed

Post by Phillmore »

If not mechanical, could be an air leak.
Andy

1954 Conquest Mk1, 1956 Conquest Mk2, 1957 Conquest Century Mk2, 1955 Austin A90 Westminster

Peter Grant
Posts: 247
Joined: Thu Mar 10, 2016 10:02 pm
Location: Sydney, Australia

Re: Idling speed

Post by Peter Grant »

I accidentally revved the bejesus out of my DE 36 once because the accelerator pedal got fouked on the carpet around the pedal opening in the floor of the car.
Frightened the bejesus out of me too, I tell you. 5.4 litres at a high rev rate in a brick garage was quite a noise.
Peter Grant

pekkak
Posts: 27
Joined: Fri May 13, 2016 7:26 am
Location: Espoo, Suomi - Finland

Re: Idling speed

Post by pekkak »

Bj Peter! Did u have a camera with u?
Pekka

Stan Thomas
Posts: 616
Joined: Sat Feb 13, 2016 2:14 pm
Location: Penkridge. Staffs.

Re: Idling speed

Post by Stan Thomas »

Good morning Peter,

Disconnect the accelerator linkage from the carbs and start the engine. This will determine if the problem is carb related, or the linkage.

If carb related, it could be sticking throttle spindles or vacuum pistons - but most likely the throttles have gone out of synchronisation for some reason. If you suspect the linkage - check the hand throttle as they have a habbit of sticking, so the linkage does not fully return to idle.

If it is the carbs (but unlikely) the setting is different dependant upon if they are the earlier type or latter diaphragm type. Idle must be set at no more than the car will just creep forward when in bottom gear and the handbrake released - bearing in mind the flywheel is fully coupled at around 900 rev/min - so a fast idle makes the car unpleasant to drive if idle is too fast.

If you get nowhere, email me on: sleevevalve@mail.com

We can then set up a dialogue and I''ll talk you through how to set everything up.

Regards,

Stan Thomas.

classiclife
Posts: 642
Joined: Wed Sep 05, 2018 9:55 am
Location: Ridgewood - East Sussex
Contact:

Re: Idling speed

Post by classiclife »

Hello Stan,

Should your email address me @gmail rather than just @mail ??

Regards.

Richard.
1968 Daimler V8-250 Saloon
DLOC East Sussex Area Representative.

Southern Classics Society Events Co-ordinator.
www.southernclassics.org.uk

Peter Grant
Posts: 247
Joined: Thu Mar 10, 2016 10:02 pm
Location: Sydney, Australia

Re: Idling speed

Post by Peter Grant »

Hi Pekka,
No camera, but I did have a witness, Mark Bearman, visiting Sydney from Western Australia.
I just pulled the pedal up by hand and the revs returned to normal.
I then made sure that the carpet was clear of the pedal and no problem since.
All very exciting!
Cheers
Peter Grant

Stan Thomas
Posts: 616
Joined: Sat Feb 13, 2016 2:14 pm
Location: Penkridge. Staffs.

Re: Idling speed

Post by Stan Thomas »

hi Richard,

No - my email address is sleevevalve@mail.com (I'm not a "G" man - that was strictly for American television!).

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