[abstraction]

If it has a carb just pump the gas 2 times and hold it about 1/4 open and roll it over. when it hits pull back to an idle. If it sounds like it will die just pump the gas again. The choke should be closed till it starts and then the vacuum will open it just a tad. The cam on the choke will hold the idle a few hundred rpms high untill the engine warms up and releases the coke. It helps if you adjust the throttle so the weight is off the cam and it can open. then it needs to be at the recommend rpm. You have and adjustment that will set the idle before the coke is released and one that will set the idle after. You must pay attention to the cable also. no need to adjust things if the cable is holding it open.

[molecular]

you start it just like a car with the same fuel system.

[Mark Petrov]

did you verify with a portable tachometer ?
if definitely runnin at 500 RPM [links]

[mike]

Re: Idle adjustment 5.7 mercarb

[Gespenster]

The idle speed on a 1991 Chevrolet refers to the RPM of the engine when the transmission is in drive, and the engine is running, like at a stop light. Sometimes, the idle speed drops too low, and the engine could stall while you're stopped. Other times, the idle speed could be too high, causing the engine to spend more gas than usual. You can adjust the idle speed to the factory specifications, or to your personal preference.

[gene]

Put the wheel chocks around the front wheels of the Chevrolet and set the parking brake. Pop the hood and take off the air cleaner on the engine by taking off the factory wingnut with your hands and setting the air cleaner away from the engine bay.

[Foam]

Have your assistant start the engine. Let the engine get to normal operating temperature. Locate the throttle cable linkage, which is on the driver's side of the carburetor, just below the bowl where the air cleaner mounts. Locate the adjusting screw, which is just above the throttle linkage. Locate the vehicle specifications sticker, which is on the underside of the hood, and lists the factory idle speed setting. [links]

[didiertomas2385]

Tighten down the adjusting screw on the throttle cable linkage with the flathead screwdriver to raise the idle speed, and loosen the screw to lower the idle speed. Have your assistant call out the RPMs listed on the tachometer in the dashboard as you adjust until you reach the idle speed that you prefer or that Chevrolet recommends on the underhood sticker.

[bytemaster]

run engine @ 2500 for 30 seconds. If idle is too low, check for plate orifice plug. If plug exists, remove it. more

[eedcvfrr]

Remove feeler gauge. Key off, restart, idle for 2 minutes

[jayrod]

Turn idle screw to adjust rpm to 650-725 more

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