rough idle : Danny's Engineportal

Vacuum Leak Detection: How to Find & Fix Vacuum Leaks Safely

04/20/2026

Vacuum leaks are one of the most common causes of rough idle, poor fuel economy, and engine performance issues. Knowing how to detect a vacuum leak safely can save you time, money, and frustration. Often, […]

Intake Manifold Leaks – Causes, Symptoms, Testing and Prevention

01/18/2026

Intake manifold leaks are the most common leaks found in an engine. Consequently, intake manifold leaks are usually the fault of the gasket. That gasket, can be made of paper, rubber, metal, and sometimes a […]

Vacuum Leaks – How To Quickly Find Them In 5 Easy Steps

11/14/2025

Vacuum leaks in today’s computer controlled engines, can cause very serious engine damage. When an engine that has computer controlled spark and fuel systems, have vacuum leaks, the following events occur. Because, these leaks pull […]

Testing to see why you have a Rough Idling Engine

Rough Idling Engine: What Does It Mean, How to Fix and Test It

02/24/2025

A rough idling engine is a common problem, of which the exact cause can be difficult to find. Also, the reasons for a rough idling engine can vary. With some being cheap easy fixes, and […]

Rough Engine Idle and Misfires When Cold: GM V8 Engines

11/21/2024

Rough Engine Idle and Misfires When Cold on GM 4.8L, 5.3L, 6.0L engines is common, and getting harder to diagnose. As, GM V8 engines are prone to a rough idle, and engine misfire when cold. […]

Feeling Rough Engine Idle On Steering Wheel

Rough Engine Idle: Common Causes, With Possible Solutions

09/11/2024

Are you having a rough engine idle, possibly rising and falling (RPM), or difficulty maintaining a steady rate of rotation? If you are, that is not a normal operating condition. And, there can be a […]

Vacuum Leak Repair - Common Locations To Leak And Causes

Vacuum Leak Repair: Locations, Common Causes, Common Repairs

08/23/2024

Having to do a vacuum leak repair, is more common than you would think. Quite often a vacuum leak, will disguise itself, as an ignition or fuel problem, that is incorrectly diagnosed. Above all, an […]

Idle Air Control Valve (IAC) Mounted on Engine

Idle Air Control Valve (IAC), Function, Failure Symptoms – Testing

03/31/2024

SO, THE IDLE AIR CONTROL VALVE, IS RESPONSIBLE FOR MANAGING THE ENGINES IDLE SPEED. And, that’s what makes the idle air control valve, a major management component of the engine. Because, it decreases or increases […]