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Revs surging up and down - not taking throttle and uneven idle

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Sounds like your intake gasket broke, creating a vacuum leak, thus resulting in idle surge and un-even idle.

Posted on Jul 17, 2008

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Engine revs up and down when reaching operating temperature, replaced all sensors sonata 2.5 v6 1999


Check coolant level to make sure it is full. Low coolant can cause surging idle. Also, check throttle plate for dirty/coking causing minimum idle to be affected. If throttle plate is dirty, clean with carb cleaner and retest

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Hi Jeff, I'm glad to help! Jeff, with the engine running tap on the throttle position sensor, If it revs-up when you tap on it then replace it. Hope this helps and have an awesome day Jeff.

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Engine light on. p0507 code Idle Speed Control system. Replaced the Throttle Control. Car still revs when in park and surges when in cruise control and idling down hills. Engine light still on. Is there a...


after replacement of throttle control an idle air volme learn must be performed or you will have the identical symptoms you descibed.unfortunately the only way to do it is with a bi directional scan tool that supports this function or take to the dealer....about 90.00 to perform the procedure.there is no back door way to do it.

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My engine revs and trys to take off while i am sitting still, the car would be in drive and my foot on the brake, It revs up and sometimes when i let off the break it surges forward then shuts down in...


The idling may be a loose connection to the "idle air control valve". if the control valve connection is secure, then it could also be a bad Throttle Positioning Sensor (TPS). To test the TPS, tap it with a screwdriver while the engine is self-revving, and see if the reving changes when tapped. if its not the TPS, then try cleaning the throttle body.

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Mar 26, 2011 | 2005 Ford Five Hundred

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When my civic is idling it goes up to 1500 revs then drops back to 800 revs and continues to go up and down like this even when the motor is up to temp


Hi, have you looked for a vacuum leak around engine you should be able to hear a hissing sound if you have a vacuum leak. If no vacuum leak, try unplugging your idle air valve,if it idles down to normal replace or take off and clean very good. If i can help you more just re post

Jan 04, 2011 | 1994 Honda Civic

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I have a 03 tiburon gt 2.7 and when you hit the gas the engine revs up to about 3100rpm for about 10 secs the drops down to about 1500 and surges up and down form 1500rpm to 2000rpm then it will idle...


its gonna be your clutch i had the same problem, when i floor it the rpms would go high then drop and take off i replaced it and it runs fine know

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On starting, the 4.7 engine immediately revs to 2000 rpm; (this has not been the norm), then after three seconds begins to back off. The idle continually surges about 500 rpm, especially on a hot day after...


this is caused by the idle air control valve this handles the idle of the vehicle when first started and adjusts when the a/c is turned on, it is probably caked with carbon you can unbolt it from the throttle body and clean the tip of it and spring on it with carb cleaner also clean inside of the throttle body where it mounts and see if the fixes the problem might have to replace it. find the throttle body it will usually be a round cylinder mounted to the side with a plug in to bolts hold it on.

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Very uneven running


Here are a few things to check check idle speed control , TPS- throttle position sensor and also very important check for vacuum leak on intake any broken hoses or intake itself gasket leaking Very possible for this problem. A simple test is when engine is running up and down use an intake cleaner (in compressed can) and spray around intake manifold if there is a vacuum leak the engine will surge up . This could man intake gasket or vacuum leak. Good luck and thanks for using FIX YA.

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Car petrol engine revolution surges.


Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

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