sticking gas pedal when brakes are on

[derbyD]

While checking to see if the motor mounts were good on a 73 240z automatic we held the brake and then pressed down a bit on the gas pedal (kind of like a power brake but not so much gas). The motor did not rock so that was good, the weird thing we noticed was the gas pedal stayed down to the point it was pressed. When the brakes are released the gas pedal comes back up. We have tried many times to repeat the process and every time it is the same, the gas pedal stays down to the point it was pressed until the brake is released. Has anyone else seen this before?

[madkaw]

Try smaller shoes ?

[Mikes Z car]

I personally have had the shoe issue, especially when I first bought my car. Someone had put those oversize metal racing pedals on. With those, any pedal could be the right pedal, just like the red green philosophy about tools.

I wonder if the linkage is binding at the firewall, maybe with more friction in the linkage than usual? That is my wild arse guess. I was thinking the engine torque might have turned the engine a bit in its mounts changing the position of the carb linkage in the area of the firewall.

Edited October 1, 2013 by Mikes Z car

[Kurbycar32]

Mikes wild arse guess about the linkage friction is probably dead on. I would also add that your return spring is ~40 years old and might be worn out. I added an additional spring until i got a throttle return feeling i was happy with

[derbyD]

ty, I will give it a try and see what happens.