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Fuel Injection & Throttle Body Cleaning? Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting gregorywbaskin New User Apr 24, 2019, 4:16 PM Post #1 of 4 (2224 views) Fuel Injection & Throttle Body Cleaning? Sign In Greetings! A shop has recommended that -- in addition to the need to replace #3 ignition coil and spark plugs -- the fuel injection system and throttle body should be cleaned. This recommendation, I was told, was because of accumulated dirt. Over the years I have heard opposing ideas about such a cleaning ... one says that it's a "good thing to do" and the other says it is irrelevant and a waste of money. So, wise community, I wonder what your opinion is? 2001 Lexus RX300 Hammer Time Ultimate Carjunky / Moderator Apr 24, 2019, 4:37 PM Post #2 of 4 (2218 views) Re: Fuel Injection & Throttle Body Cleaning? Sign In And who told you it was a waste of money....Billy Bob down the street with his adjustable wrench and hammer. Yes, injectors build up varnish on the inside of the spray nozzles and can lead to misfires and piston damage. The idle speed is controlled by metering of very small amounts of air around the throttle plates. The oil fumes that are reburned through the breather and PCV cause a buildup of crud on the backside of the throttle plate and the inside bore of the throttle body. This prevents the throttle plate from seating in the closed position and letting in unregulated air which leads to unstable idle speeds and intermittent stalling. So, yes this maintenance is important. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. gregorywbaskin New User Apr 24, 2019, 5:04 PM Post #3 of 4 (2208 views) Re: Fuel Injection & Throttle Body Cleaning? Sign In Thank you very much. Hammer Time Ultimate Carjunky / Moderator Apr 24, 2019, 5:08 PM Post #4 of 4 (2204 views) Re: Fuel Injection & Throttle Body Cleaning? Sign In You're welcome. You never mention your mileage but these things wouldn't be needed until over 50K at least. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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