Hi John:
Have you checked that the spring weights in the distributor are not rusty,
stuck with gunk or just weak. It sounds like the timing is staying too
advanced. When you force the engine down to low speed, the weights come in and
the timing retards as per normal, but without that external slowdown, the
setup is just floating.
Mark Hooper
1972 TR6
________________________________________
From: 6pack-bounces@autox.team.net [6pack-bounces@autox.team.net] On Behalf Of
John North [johncnorth@gmail.com]
Sent: June 21, 2010 9:46 PM
To: Triumph 6 Pack
Subject: [6pack] Idle increases to 2000 rpm
When I coast to a traffic light...
If I disengage the clutch when the rpms are over 1500, then they do
not drop, but increase to around 2000 and stay there. Blipping the
throttle leaves it at 2000 rpm
If I disengage the clutch when the rpms are below 1200 then the idle
drops to the 750 range and everything is normal.
If I am at idle and I throttle up to 1500, and release the throttle,
then the idle continues to increase up to 2000.
I have disengaged the linkage and operated each carb separately from
idle, but either carb creates the same increase up to 2000.
I switched the pistons thinking when I rebuilt them I somehow switched
them and they are hanging up, but no effect.
The fast idle appears to be OK, not touching the cam. When the
engine is running at 2000, I cannot manually move the linkage to get
the idle back to normal, it appears to be at rest. Once at 2000 rpm,
I can manually pull down the piston on either carb and the idle
settles down to 750.
Looked for vacuum leaks around the throttle shafts and gaskets, can't
find any...
This does not prevent me from driving, but it means coming off gthe
gas does not drop the engine to idle - it sticks at 2000 so I am not
slowing as fast as i should and need to brake more. Plus it's
embarrassing to coast up to a light at 2000 rpms
Any suggestions appreciated.
John North
1976 TR6
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