Why is my idle so high?

In modern vehicles, engine idle speed is most often controlled by the idle air control (IAC) motor. When your car’s throttle is malfunctioning, this can cause your car to stall or idle high. Often this is a result of dirt buildup in the air intake. Other times it can be a problem with a cracked intake tube.

How long does idle relearn?

It could take as little as 30 minutes if you drive exactly in a specified way. Other times it may take a week or so. In the end, it does matter though because the engine control module is constantly learning and making sure your car is running optimally.

How do you change the idle speed on a Chevy?

You can adjust the idle speed to the factory specifications, or to your personal preference. 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.

What’s the idle speed on a 1991 Chevy?

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.

Why does my car stall at the idle speed?

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. Step 1

Where do I find the idle speed setting?

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.