Sticking Throttle

[DC0046]

Newbie here. Have a 77 Vert with a 2074 and dual EMPI HPMX 44s. Had problems with the accelerator pumps leaking on both sides and in spite of my efforts couldn’t get them to stop. Took car to a local VW tech and he planned them down and no leaks. Got car back and now the throttle sticks. I have literally 50 plus hours in working with the linkage, etc, but still problems. Helm joints are fee and lined up. There is no sticking until the car gets up to operating temp (about 250 CHT on number three). Sometimes I can blip the throttle and get the idle back to normal. Sometimes not. I am confident it is not in the throttle cable and I believe the cause is in the passenger side carburetor. Thanks in advance for your help.

[oprn]

What have you got for return springs?
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[DC0046]

Stock return springs, although I have cut about four coils on the passenger side carb to increase tension.

[67rustavenger]

Most times a pic or 800 help solve a problem here.

I have a very busy engine compartment. But my linkage still moves freely with then stock dual carb springs.

You have a problem that is causing the throttle linkage to stick at a certain position.
Get the engine up to temp and see if you can get a pic of the position that the linkage is sticking open.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!

There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo!

[mikedjames]

Sometimes this can be the throttle butterflies catching on the side of the carburettor throat - try loosening the screws holding them in place on the spindle and then letting the butterflies settle into place as they close, then tightening the screws.

If they are fixed in place slightly too closely together on the same throttle spindle, as the body expands at a different rate to the spindle, the butterfly is more likely to catch.
_________________
Ancient vehicles and vessels

1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.

1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy

[Dale M.]

[sled]

well, before you go taking carbs apart and messing with internals, try slightly loosening the throttle shaft nut on the offending carb. You will have to bend the lock tabs back, and then back the nut off a hair. You might have to do this on both ends of the shaft, or try one at a time to find out which side is binding.

I had one carb on a customers engine that did this exact thing, when hot it would stick open slightly causing the engine to race. Slightly loosening the nut fixed this.


hopefully its something simple like that!
_________________
drive your split.

[DC0046]

Thank you everyone for your replies. I will try loosening the the nut on the clock spring first and go from there. In reference to the return springs, they are very similar to the posted picture. I didnt build this engine and they were on the carbs when I purchased the car about four months ago. I cut about four coils off of the the passenger carb to stiffen the return spring. I will try to get pictures posted in a bit. Thanks again. These things have more moves then a belly dancer and really have me scratching my head.

[sled]

additional springs should NOT be used. If you need additional springs other than the factory springs, you have a problem.
_________________
drive your split.

[oprn]

[sled]

I fail to see how additional springs would increase drivability or decrease fatigue. Its just going to make the pedal feel stiffer, and put undue stress on the cable and all of the links/connections/pivots.


I also ALWAYS install a soft braided cable in every bus of my own, and customers buses. Solid wire cables suck.
_________________
drive your split.

[oprn]

Well, if you have tiny feet and wear ballet slippers... it might not be a problem. I am 6' 1" and take #13 boots so find most cars have gas peddles that are too light.
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)

[sled]

then you should be adding a heavy spring at the pedal, NOT on the carbs. like I said, all its going to do is wear things out and potentially tweak things. That extra spring on the throttle shaft thats pulling in a linear motion will cause premature wear and tear.

and if we're comparing stature for pedal pressure, Im 6' and do not have ballerina feet.
_________________
drive your split.

[DC0046]

Pics of the engine bay. Thanks again for any help.

[Dale M.]

[sled]

[DC0046]

Pics of the car.

[fl59bug]

Nice looking ride you have there, bet it's fun to drive with the top down

[DC0046]

Thank you. Hopefully I can get these carb issues worked out.

[oprn]

The whole car is junk! I am coming to do you a favor and take it off your hands before it costs you anymore money. What is your address?


By the way, I see what your spring problem is. Hang on and I will draw you a picture.
_________________
We had the stone age, the bronze age, the industrial age and now we are in the age of mass deception and mind control for corporate profit. (The mass media age)