Question about Toyota Corolla

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03 corolla petrol revs up on its own when idling and then settles down again

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That is normal
and lasts longer the colder it gets.
but you never said how cold or how long, in time.

only out of gear
it must never rev up , by self , in gear. ever
or join the Toyota lawsuits.

Posted on Jan 04, 2014

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  • Expert
  • 61 Answers

R u start the car in cold morning or any cold condition? If so, it is normal revs up itself. Sometimes I see some cars revs up to 2000 rpm for 2 to 5 mins, then drop down to 1000 rpm.

Posted on Jan 04, 2014

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Posted on Jan 02, 2017

emissionwiz
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SOURCE: 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.

Posted on Nov 12, 2008

michigan man
  • 3533 Answers

SOURCE: rough idling and choke

the only thing that can cause this is maybe you have a bad planium gasket but before changing this you could also have gotten some bad gas cause most gas have 12% water or more so try STP gas treatment first

Posted on Jan 03, 2009

  • 286 Answers

SOURCE: '03 Toyota Corolla 1,4 VVT-i 4ZZ engine idle rpm

Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck

Posted on Apr 05, 2010

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park or moving.? both
hot engine or cold or both?
we can go as far as you want, ask. 03 corolla.

what engine, but ive asked 4000 times, now, and zero answers.
no own knows, it seems whats under that hood,
do tell. at least you know its and o3.

do answer as it is dangerous car moving, id not drive it.

btw , this is called idle controls.
and is the last thing on any EFI engine to work right.
on new cars its the first to fail due to Throttle by wire BS.

the idle controls can fail for fuel mix wrong, or vacuum leaks.

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Every time i start my car it sounds like the revs are high then settles to normal revs what is causing this


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Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck

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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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