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TR2/3/3A The sticking throttle issue again....(.long post)

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K

karls59tr

Yoda
Bronze
Online
I have most of the throttle linkage issues resolved but I have an unusual one that I have to deal with now. First of all my car likes to idle at 1500 to 2000 rpm.Way too high I know .If i lower the idle to 1000 rpm the car will stall out. Other than that the car runs fine and the plugs are a nice tan color. I can give the gas pedal a quick kick and the idle will drop from 2000 to 1500. I have tried adjusting the idle screws on the carbs but to no avail. Say I'm going 20 mph...I can take my foot off the gas and the car will continue at 20 mph almost like cruise control until I kick the pedal down and it drops a bit. Today I pulled over and parked the car ,left it running and idling at 2000 rpm, hooked my foot under the pedal and pulled it back and the car immediately stalled out and died. I believe the issue has to do with the gas pedal link bar(no.88 in the Moss catalog) where it attaches to the cross bar that runs across the firewall and is connected the gas pedal. I tried to find a picture in the Moss catalog of the cross bar and how it's connected so I could call the parts by their proper names but I have been unable to find a photo of the assembly? So here goes....at the firewall near the rear carb is a mounting bracket that holds one end of the cross bar(cross bar is not bent). At that point attached to the cross bar is a 4" long X 1" vertical steel plate(has the return spring attached to it)that goes up to the carb throttle linkage bar(no.88) in the Moss diagram.Looking under the hood when I move the throttle linkage I can see that the cross bar does not move at the same rate as the linkage....in other words it's loose there? How is the cross bar connected to that steel plate linkage so the two pieces can operate in tandem? Hope this makes sense. Karl I think there may 2 small pins that are missing that hold the bracket to the bar???? Anyone have a close up of this area they can post?
 
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From the internet...

images (6).jpeg


images (7).jpeg
 
He might have that, too....
K

TR2/3/3A Thread 'Idling issues and gauge readings.....'

When the engine is at operating temperature it wants to idle at 12 to 13 grand and sometimes up to 15. Seems to me others on here get their cars to idle a 800 rpm? I do have a mild street cam so that might account for some of the difference in idle speed. I tested the throttle shafts with a drop of oil to see if they were worn but it did not seem to change anything? If I kick down the pedal at idle at a stop light the rpm will often drop down to 10 grand and below and it feels like it is about to stall out? The car runs fine otherwise. Any thoughts?
 
CJD said:
An idle that high is an intake vacuum leak somewhere.
Click to expand...
Well I re torqued the manifolds and that solved the leak I found there when I did the spray test. cant think where else there might be a vac
3798j said:
From the internet...

View attachment 109979

View attachment 109980
Click to expand...
3798j said:
From the internet...

View attachment 109979

View attachment 109980
Click to expand...
Thanks for the pic.
3798j said:
From the internet...

View attachment 109979

View attachment 109980
Click to expand...
Thanks for the pic. I believe there is an issue with either of the pins in the diagram no.26 or 30 or maybe no.22??? Guess I'll have to take that area apart and have a look. Anybody had an issue with this gas pedal setup and taken it apart?
 
First eliminate the linkage altogether by loosening one of the accordion clamps (Moss #66) that hold the throttle shafts together and removing the bellcrank to carb linkage (Moss # 83). Make sure the throttle plates move smoothly to full closure solely via the return springs built onto the carbs. Adjust the idle and mixture for each carb and see if you can get it to idle at 800 or 1000. If so, you can work your way back up the linkage chain to see what is binding.
Bob
 
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