Back to all

Idle Talk about Engines (Causes of Rough Engine Idling)

February 16, 2020

When you slow down at stoplight, your vehicle's idle should be smooth as silk.  But what happens when the engine is missing or idling roughly? That's your engine's way of telling you, "Hey, I've got something wrong with me and if you don't get someone to find out what it is, I may not start the next time you turn the key."

You can help your service facility if you can describe the problem in detail.  Here's a list of things to make a note of:

  • When is the problem happening, when the engine is cold or when it's been running for a while?
  • Does the rough idling occur when I'm accelerating or when I'm going at a steady speed?
  • Does it happen at high speeds?  Does it happen low speeds? Does it happen at both?

Make sure you describe the problem in as much detail because it will help a technician diagnose the problem.

One of the first things they'll check is how the spark plugs are firing.  Modern iridium plugs are supposed to last a long, long time.  But they CAN eventually wear out.  Inspecting the firing end can help the technician figure out the root of the problem.  Corroded or worn out spark plug wires, too, can contribute to an idling irregularity. 

There are other potential problem spots, too.  The technician may check the ignition coil, timing piston rings, valves and cylinder walls. 

If the mixture of air and fuel isn't correct, that may affect how smooth your vehicle is running.  Your service facility is equipped with diagnostic equipment that helps them pinpoint the problem.  Once that idle is smoothed out to the way it used to be, you'll be the smoothest operator on the road.

Tuffy Tire & Auto Service Center Lockport
600 E 9th Street
Lockport, Illinois 60441
815-838-3700

More articles from Tuffy Lockport

Keeping Yourself in Suspension (Control Arm Assembly Replacement)

December 29, 2024

When you are pointing your vehicle straight down the street, it should go straight. Thats pretty straightforward, right? Sometimes, though, you may notice you have to keep adjusting the steering wheel to keep going straight. While that could be caused by many different issues, one possibility i... More

The Cable Guy (Battery Cables and Maintenance)

December 22, 2024

If you've ever noticed your vehicle's lights are dim or not working at all, the problem could be many things. But one possibility is your battery cables aren't doing their job. A power outage in your vehicle is similar to one in your house and needs to be repaired to get things back to normal. ... More

THE IMPORTANCE OF VISIBILITY (Cleaning Vehicle Glass)

December 15, 2024

We've all been through it. The vehicle ahead of us kicks up mud, slush, snow or salt on our windshield and we can't see a thing. And not being able to see a thing when we're driving? Not a good thing. Debris on a vehicle's glass can be blinding when driving directly into the sun. And other thi... More