The throttle body controls how much air enters your engine. Over time, it can collect dirt, carbon, and grime that restrict airflow, leading to poor performance.

• Hard starting
• Rough or inconsistent idle
• Poor acceleration
• Stalling or hesitation
• Higher fuel use
• Extra exhaust smoke

If you notice any of these, it’s time to clean.

• Cars/trucks: Every 30K–50K miles
• Small engines: Once per year or after long storage
• Dusty or seasonal use: Check more often

• Cars & trucks
• Motorcycles & ATVs
• Lawn & garden equipment
• Boats & generators
• Tractors & outdoor power tools

What you’ll need:

• WD-40 Specialist_® Carb/Throttle Body Cleaner
• Clean, lint-free cloth or shop towel
• Flathead screwdriver or socket wrench (to remove intake hose)
• Safety gloves and glasses
• Optional: small, soft brush for stubborn buildup

Things to Consider:

• Make sure the engine is turned off and cool.
  Work in a well-ventilated area and avoid breathing in fumes. Remove the air intake hose.
• Spray cleaner onto a lint-free cloth.
  Don’t spray directly inside — this keeps sensors and coatings safe.
• Wipe the throttle plate and bore.
  Clean both sides of the plate and the surrounding housing until the buildup is gone.
• Let dry completely, then reassemble.
  Reattach the hose and clamp once everything’s dry and secure.

What happens if I skip it?
Poor mileage, rough running, more emissions.

Can I clean it while it’s still on the engine?
Yes. Just remove the air intake hose and wipe with a cloth.

How long should it take?
About 10–15 minutes.

A clean throttle body = easier starts, smoother idle, better mileage. Grab WD-40 Specialist_® Carb/Throttle Body Cleaner and make it part of your maintenance routine.

Pro Resources
Want to go deeper into engine care or learn trade-tested maintenance techniques? Visit WD-40 Techs & Trades for expert tips and training.