1980 Quadra jet Carb. problem. The engine races, will not idle.?

Question

Here's the deal! I picked up a used chevy truck for the motor. It ran fine except for a skip. figured it was plugs and wires. This is a 87 chevy engine. I changed the wires and such and changed the cap and rotor. I swaped my old motor(blown) and swaped the 87 enigine in. Hooked everything up and started her up. Starts fine but the engine races up around 2000 rpm(guessing but close.)When I swaped motors I changed nothing except for the above mentioned. Never touched the carb. Plugged off one line of which went to a tube from the old exhaust manifold. Any ideas?

Sorry about the confusion. I have a 1980 chevy pick-up in which I blew the motor. I picked a 87 chevy pickup for the motor. Prior to taking the motor out of the 87, I had it running, wanting to make sure the motor was. It ran fine, with the exception of a skip. No biggie! figured on a bad plugs or wires. Of which would be changed any how. I unbolted the motor in the 87. the tranny, exhaust, wires, etc. The carb was not touched. It was left bolted to the engine. the only items that were touched for the carb, was the vacum advance, brake booster line, fuel line, wire for electric choke. The only other item from the carb that was touched (plugged off) was the line that went to a tube off the exhaust manifold. Other than that, I took this motor and put into my pick up. Bolted everything up, put on the new wires,plugs, dist. cap and rotor. Filled the fluids. And started her up. It went to a very high idle. I checked for air leaks(none), checked all vacum lines. timing is right on.

Answer 1

Your English is terrible and it really affects the reading of this problem. I am not sure if you have installed a used motor into the old truck or an old truck has now got your old motor??? Anyways, it sounds as if it could be a throttle cable, trans. shift cable, or some kind of mounting problem for either as if nothing else was changed it should all be the same. The simplest way to figure all this out is to remove the cables from the carb and see what happens. Quadrajets are a very simple and reliable carb. If there is still a problem, make sure the choke is coming fully off. You can check this by inspecting the base idle at the left hand side of the carb. while the motor is supposed to be idling. If the carb. has some kind of high idle on, the carb. will not be resting on this stop screw. If this is the case, you have a choke or linkage problem on the right side of the carb. To release the choke, hold the choke butterfly open all the way with the throttle open, but with the motor shut off. While keeping the choke open, let the throttle close and leave it alone as it should now be at base idle. Restart motor to check. Generally speaking, there will be a problem of high idle with all choke or linkage on the right side of the carb. There will not be a problem inside of this carb. causing this. Re-inspect the linkages, cables, mounting points for them, and if that doesn't help, release the choke and go from there.

Answer 2

Did you put the 1980 carb on the 87 engine?. That's not clear in your description.

Check for vaccum leaks first. Make sure there are no open ports anywhere. Then check the ignition timing. Both of those things will cause the problems you are describing.

Answer 3

Engines with carburetors have a intense idle while chilly to shorten the warmth up time, once you placed the choke by utilising hitting the gas as quickly as, it contraptions a cam on the throttle linkage so it truly is going to idle speedier so the engine will heat up speedier, that's totally frequent on your automobile.

Answer 4

Did you change the distributor? Sounds like it might be advanced timing.