[TR] Causes of fast idle TR3

[Wbeech]

Frank,

Please post the successful result, I have the same problem.  I can pull back
on the accel pedal and reduce the engine speed by 500rpm.  Springs are all
good, tight and in the proper slots.  I did notice that a friends 1962
Morgan, TR3 motor, has an additional return spring off a bracket mounted to
the front exhaust mani-bolt.  I can get a little bog when I spray started
fluid at one of the newly re-bushed butterfly rods, but the is no play
there.

All the best,
Bill

Bill Beecher
'58 TR3A TS/30766L "Tarbaby"
'62 TR3B TCF/2549L " Aunt B" (in rehab)
www.triumphowners.com/1566
'68 Land Rover Series IIa 88" "The Beast"
"If you think you have everything under control... You're driving too slow"
M.Andretti


-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Frank Fisher
Sent: Tuesday, January 01, 2013 7:43 PM
To: Triumphs
Subject: [TR] Causes of fast idle TR3

happy new year to all
B
Since putting the TR3 back on the road I have suffered an idle speed that I
canbt get below around 1300/1400 at best.
Now
that the season is over I decided to fix some things.
When I put the car back
on the road I did not rebuild some parts under the premises of bif it aint
brokeb and i donbt spend cash I donbt have.
B
B
Had my distributor
rebuilt by Advanced. Fitted that today.
B
Decided to work the carbs myself.
In the past when I sprayed a little starting fluid at the ends of the
throttle shafts it would bog down the motor..Just a little. It did NOT
increase engine speed.
I am running the TR4 PCV valve setup. The round pancake type. All new
diaphragm.
While checking the disassembled carb body I found the old throttle shafts to
be worn. About 0.010b undersize. But I found the existing bushings to be
only 0.002 max out of round and no worse than the new bushings I had to
replace them. So I did not replace the bushings. Max clearance now from new
throttle shaft to old bushings are from .002 to .0035. I have access to a
very big fully equipped machine shop with excellent facilities for
measuring. Ibm confident in those numbers.
Installed new butterfly valves with the Ground surfaces to mate against
carb.
B
fitted the carbs today also.
B
Got the car
together today and I have no improvement in reducing the idle speed.
B
If I
put my foot under the gas pedal and pull it up, I can reduce idle speed by
about 300. it was always like that. adding a spring strong enought to do
that for me made the pedal horribly heavy.
B
Disengaged the PCV valve to see if
there was an air leak. No.
B
Squirted starter fluif around the intake manifold. No change in idle speed.
B
I guess I did not spray the throttle
shaft again! Duh! Will check that Saturday again.
B
Car runs, but not right
just yet. I think I need to play with the timing some. No power at low revs,
kicks into power at about 2000. I think that I just need to mess with
ignition for now.
Exhaust note has changed though. Sounds like a tractor now and I donbt have
the 2500 howl.
B
Any thoughts on where to start looking for cause of idle speed will be
appreciated and tried this coming Saturday B Thanks Frank

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