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Idle Issues 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 Steve'o New User May 21, 2012, 8:23 PM Post #1 of 4 (1462 views) Idle Issues Sign In !991 Toyota Pickup 2.4 4cly 22RE 160k Truck ran fine when first purchased a month ago, just recently the idle has gone a bit haywire when cold. Starts idle at 2000rpm when cold then when starts to warm it bounces from 1500 to 2000 for a bit then to 1000 to 1500 and so on for about 20 min or so. But when engine is warm it stays right at the 750rom idle speed. When it is surging it sounds as if a hissing sound like a gasp of sort is happening. I havent found any vac leaks and tried a diagnostic computer but had no luck, the engine light flashed as if nothing is wrong. Any suggestions?? nickwarner Veteran / Moderator May 21, 2012, 8:26 PM Post #2 of 4 (1457 views) Re: Idle Issues Sign In What is the fuel pressure when this is happening? What is the current tune-up status? Since you just got it would be a good idea to pull some plugs and look inside the cap. At least you found a simple truck to work on. Hammer Time Ultimate Carjunky / Moderator May 22, 2012, 3:09 AM Post #3 of 4 (1406 views) Re: Idle Issues Sign In You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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. Steve'o New User May 23, 2012, 10:35 AM Post #4 of 4 (1363 views) Re: Idle Issues Sign In Cleaned the throttle body today, a lot of nasty mung came out, also pre ordered the IAC just incase, is this something that is easy to replace?? Any specific things i should look out for if it comes down to it?   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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