Question about 2001 Toyota Corolla

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98 Corolla stalls or stumbles when cold

"Car stalls when engine is cold". When accelerator is pressed the car hesitates (goes very slow) then picks up. When engine is hot there is still a slight lull in the idle speed. Tank was run pretty well empty just a day before I first noticed it 4-5 days ago. Initially the car just stumbled which was 4-5 days ago. Today it stalled all together but after a few attempts to start it started right up but stumbled for a while.

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  • mikewjanes Oct 06, 2009

    I just brought it by a mechanic friend of mines place. He plugged into the computer and came up with an error code for the coolant temp sensor. His scan tool was unable to tell him any details about it but he figures it's faulty causing the computer to add to little fuel while the engine is cold. Thanks for your answer though. I'm going to add some gas line antifreeze and a cleaner just in case before I change out the sensor.

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It sounds like you may have picked up some small debris from the bottom of the gas tank when you ran it empty. You may need to run a fuel/injector cleaning solution through the next tank of gas to clear the debris and consider changing your fuel filter too. Sea Foam is a great fuel additive and I recomment trying it full strength. Hope this helps!

Posted on Oct 06, 2009

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- stumbles when stopped and accelerating at low speeds


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Hesitation or stumble during acceleration


take your car for a tune up
if they are carburetor type motors you may need your carbie cleaned and a tune up
if you clean it your self with carbie cleaner it may increase in idle speed this is nothing to worries about it is a simple adjustment
with a carburetor type motor they tend to idle higher when their cold this is the automatic choke kicking in and normally it should happen till the car is a bit warmer and the accelerator has been depresses
although a car should idle at 800 rpm my paddok car dose when it is cold it idles at 1200rpm i like it this way as the car warms up quicker as i will not drive a car while it is cold
hope this helps
ricko

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