Problem with sticking acceleration

[paulcomi]

1964 monza convertible with 110 hp 4 speed 2 carbs with a Pertronix and stock coil (Pertronix wired to harness). Pulled and cleaned my spark plugs a couple days ago and reinstalled them. Sprayed electronic contact cleaner in ends of soark plug wires and distributor connections as well as coil connections. Sprayed carbs with carb cleaner, took it for a drive and a few times my gas pedal acted like it was stuck accelerating. Checked my linkeage and made sure it wasn't binding. Sprayed some lubricant on linkeage and replaced the pull back spring today and it did it again a few times. If I tap on the pedal when the engine is revving it will let go and come back to idle. Thought maybe something was stuck inside carb so I looked inside with flashlight and don't see any debris.

[cad-kid]

On my 140 the sparkplug wires can sometimes interfere with the linkage causing issues.

[paulcomi]

Just reattached th pedal to crossbar linkeage and t seems to be better took it for a ride and it didn't di it once. Hope it's something simple like that

[64powerglide]

Did you check the pedal itself, could be some rust on the shaft.http://www.corvair.com/user-cgi/catalog ... IN&page=72

[terribleted]

Is the car warmed up? An active choke could cause higher than normal rpm's that decrease after blipping the throttle. Chokes adjusted properly?

Most likely is a binding throttle though..... wear, corrosion, bent or out of alignment linkage joints are common. Have you replaced all the bushings from the pedal all the way through the throttle linkage to the cross shaft and cleaned, lubes and re-bushed the pedal itself? If not ,do so, the parts are cheap and it will fix most binding issues as long as you straighten and align damaged and out of place pieces along the way.

[paulcomi]

Would it be possible that my choke is engaging? My left carb butterfly has a plastic bushing that broke that affects the choke from working when it's cold. Might that engage when I downshift?

[terribleted]

What plastic bushing? I know of no plastic bushing on the butterfly. There is a plastic choke lever (some are metal) that is part of the carb linkage if that is broken it can cause multiple problems. There are a couple adjustments that depend on the choke tripper during rebuild. Can not properly adjust the carb with it broken. Problems like this can not be ignored. If you have broken carb linkages I would start with a thorough complete carb rebuild before I did anything else. You can not expect proper performance from broken parts. Most common lack of power problems in Corvairs are in order Carb issues, Ignition issues, Wear issues (low compression).

[funvairs]

It's a bit of long shot, but check the rubber boot where the throttle rod passes into the engine compartment. Just recently I had a boot separate and the end of it traveled back along the rod, getting between the rod and the fan housing. This caused a high idle, blipping the throttle would allow the idle speed to return to normal, until the next time.

[Nickshu]

On the two cars I have removed the accelerator linkage setup from both had VERY stiff gas pedal pivots. Worth checking. Clarks' sells all the parts to rebuild including new pivot tube. Pressing the new gas pedal onto the shaft turned out to be more of a pain than expected. Instructions for getting the pedal angle right are in the shop manual.

[Francesco]

This same thing happened to me. After rebuilding the ENTIRE linkage, and lubing it a million times, I found out that the pivot into the transmission was SLIGHTLY bent, and was catching ever so slightly. replaced it, and no problems since then. Good luck.
EDIT: It would stick when slowly letting the gas out. A sudden jolt had enough momentum to go back to idle.

[larry202br]

Would it be possible that my choke is engaging? My left carb butterfly has a plastic bushing that broke that affects the choke from working when it's cold. Might that engage when I downshift?

That could be. If the choke pull-off or related parts are damaged, you could have the fast idle cam engaging randomly.

[azdave]

Would it be possible that my choke is engaging?

After the engine is warm, lockout the chokes into the full open position temporarily with a rubberband and make sure the fast idle cams are not near the idle arm. Now test drive.

It could be the fast idle cams but it could also just be a lot of wear and slop in the linkages after so many years of vibration. Some people install a really strong accelerator return sping but that can lead to excess wear on the throttle shafts.