If you have an SU setup, maybe you have worn throttle shaft(s)? If severe,
they would hang up, as well as essentially change the mixture in certain
positions (by allowing too much air through). Just a thought....
-----Original Message-----
From: T. .R. Dafforn <td214@cam.ac.uk>
To: spitfires <spitfires@autox.team.net>
Date: Monday, April 17, 2000 5:48 AM
Subject: Throttle control problems
>
>Hi Listers,
>Finally after 2 1/2 years my car is legal again...
>However I have just picked up a problem...
>While driving back from the test station the throttle seems to stick
>open causing the car to idle at 3K rpm...
>Quick blip on the throttle and it dropped back to idle at 750 rpm...
>Then it happened again 5K rpm...
>blip and back down..
>Got back and had a look at the throttle linkages, they seem fine
>although the car has never had the return spring which attaches to the
>header are these required? It has always relied on the return springs on
>the carb...
>Also noticed that the rear float bowl was leaking where the tube from
>the jet screws in....
>Does any one have any ideas whether the problem is mixture or sticking
>throttle cable (which btw is brand new!!)
>hope some one can help
>cheers
>Tim
>PS the car is a 1500 twin SU carb...
>
>--
>Tim Dafforn
>Structural Medicine
>Department of Haematology
>CIMR
>University of Cambridge
>Wellcome-MRC Building (Level6)
>Hills Road
>Cambridge
>CB2 2XY
>
>Tel. (01223) 336829
>Fax. (01223) 336827
>http://smokeroom.cimr.cam.ac.uk/
>
>
>
|