What is the idle speed screw on a Monte Carlo?

These carburetors have two adjustment screws to give you the best fuel efficiency for your Monte Carlo. The idle mixture screw allows the fuel to enter the carburetor at the specified amount based on how you set the mixture, while the idle speed screw adjusts the amount of rpm’s that the engine will reach at idle speed.

What to do when your car is at high idle?

While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly. Step 3 – Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets.

How do you idle a vacuum engine at idle?

Turn the mixture screw another 1/4 turn clockwise to continue leaning out the fuel. Continue this process until the engine is about to starve out for fuel at idle, and turn the mixture screw the opposite direction (counter-clockwise) about 1/4 turn. Adjust the idle speed screw one more time, until the vacuum gauge reaches 850 rpm’s.

What causes an engine to stall at idle?

If the ISC valve is gummed up with fuel varnish or dirt, it may stick, preventing the engine from maintaining the proper idle speed when the throttle closes. A faulty idle speed control circuit may also allow the engine to stall when idling if it fails to compensate for idle loads placed on the engine by the charging system or A/C compressor.

How do you lean out fuel at idle?

Turn the idle speed screw until the vacuum gauge reads 850 rpm’s, and then turn the mixture screw clockwise about 1/4 of a turn to lean out the fuel. The idea is to reach the leanest fuel mixture possible, while allowing enough rpm’s to keep the vehicle running at idle. Look at the vacuum gauge, and see if the rpm’s have changed.

Can you run a Monte Carlo in an enclosed garage?

Do the adjustments on your Monte Carlo in an open environment. You will need to keep your vehicle idling for a little while, so do not run the vehicle in an enclosed garage, where dangerous carbon monoxide fumes can build up.

What kind of carburetor does a Chevy Monte Carlo have?

The Chevrolet Monte Carlo has typically come stocked with a 2 or 4 barrel carburetor, depending on the size of the engine. These carburetors have two adjustment screws to give you the best fuel efficiency for your Monte Carlo.

Where is the air cleaner on a Monte Carlo?

Detach the tachometer from the ignition coil, and put the air cleaner back on top of the carburetor. Secure the air cleaner to the carburetor with a wing nut, and turn the engine off. Do the adjustments on your Monte Carlo in an open environment.