How to Fix Rough Idle
Learn how to fix rough idle with our detailed step-by-step guide. Follow our easy instructions to get it done right.
Your Progress
0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Scan for Diagnostic Trouble Codes
Step 1: Scan for Diagnostic Trouble Codes
Use OBD2 scanner to check for misfires, vacuum leaks, or sensor codes causing rough idle.
OBD2 Code Reader
Diagnostic scanner for reading engine trouble codes
Engine Repair Manual
Troubleshooting guide for rough idle issues
2 Step 2: Inspect and Clean Throttle Body
Step 2: Inspect and Clean Throttle Body
Remove air intake, spray throttle body cleaner on throttle plate and bore, wipe clean.
Throttle Body Cleaner
Spray cleaner for removing carbon deposits
Cleaning Brushes Set
Soft brushes for cleaning throttle body
3 Step 3: Check for Vacuum Leaks
Step 3: Check for Vacuum Leaks
Inspect vacuum hoses for cracks, listen for hissing, spray starter fluid around intake to find leaks.
Vacuum Hose Assortment
Replacement hoses for fixing vacuum leaks
4 Step 4: Replace Spark Plugs if Worn
Step 4: Replace Spark Plugs if Worn
Check spark plugs for wear, carbon buildup, or improper gap - replace if old or fouled.
Spark Plug Set
OEM-quality replacement plugs for your engine
Spark Plug Socket
Deep socket for removing spark plugs
5 Step 5: Clean or Replace MAF Sensor
Step 5: Clean or Replace MAF Sensor
Spray MAF sensor cleaner on sensor element or replace if cleaning doesn't resolve idle issue.
MAF Sensor Cleaner
Specialized cleaner for mass airflow sensors
Mass Airflow Sensor
Replacement MAF sensor if cleaning fails
6 Step 6: Check Idle Air Control Valve
Step 6: Check Idle Air Control Valve
Clean IAC valve with throttle cleaner or replace if stuck or malfunctioning.
Idle Air Control Valve
Replacement IAC valve for your vehicle