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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   2006 Toyoto Camry XLE Driver Side Electric Window Trouble Hello, Looking for a little brain help ...   Tierod end change caused some kind of leak Hello so I just took my car to the nearb...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...

Search Auto Parts Search engine revs up and down Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Engine Troubleshooting mrc55 User Jan 23, 2014, 2:43 PM Post #1 of 3 (1416 views) engine revs up and down Sign In 1996 Honda Civic, 1.6, 249,000 When car warms up engine starts a rev/decline thing and won't stop. Revs up and down up and down. If you take it out of park it stops. Only change is I put on a cold air intake. Discretesignals Ultimate Carjunky / Moderator Jan 23, 2014, 3:04 PM Post #2 of 3 (1406 views) Re: engine revs up and down Sign In Check for vacuum leaks. Don't mess with the idle air screw. Also make sure the coolant is in good condition. You could also have a problem with the idle air control valve assembly. You can tell by putting your finger over the idle air control intake port in the throttle body before the throttle plate with the engine running. If the idle comes down, you have a problem in the idle air control system. The reason the engine is idling that way is because you have unmetered air getting into the intake. When the idle gets too high in park or neutral the engine computer turns off the injectors. Then the cycle repeats. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved. Hammer Time Ultimate Carjunky / Moderator Jan 23, 2014, 3:49 PM Post #3 of 3 (1391 views) Re: engine revs up and down Sign In In addition to what DS suggested, some of these Hondas were equipped with a deceleration valve that can leak internally and also do that. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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.   Email This Post   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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