Question about 1999 Toyota Camry

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1999 Toyota Camry Idle Problems on Hot days

I have a 1999 toyota camry 4 cyl with 70,000 miles on it. On really hot days when I stop at a light, the idle can suddenly drop and bounce suddenly. During stop and go driving in summer I have never seen the temp guage go beyond half way. On a hot day (above 95 deg) the temp guage can hit the half way mark within a mile or two of in town driving. Soon after it reaches half way mark the idle speed at a light will usually drop to 600 RPM. Usually after the first time I noticed the rpm at 600 at a stop, at anytime while stopped the idle can suddenly drop to 400 and bounce back up to 1000. It feels like the engine is about to quit and the idle is real rough. At a stop when this occurs, I shift into neutral or park and accellerate slightly to keep the rpms above 600 rpm. If I use the conditioner the idle problem will show up sooner. During the idle problem the check engine light never comes on. Also after the idle problem first appears while driving at a stop, at any time while driving I can lose power during acceleration. It kind of have syptoms of vapor lock but the fuel filter under the hood is always cool enough to touch. I have taken it to shops and they checked the computer, fuel pressure, etc. and couldn't find anything wrong. This problem never occurs in winter or when the temp guage is below the half way mark. I had the EGR replaced, new plugs, cleaned the throttle body and had the injectors flushed. This didn't solve the problem.
This has been happening the last three summers. Any ideas what could be causing the problem and how to resolve it.

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  • dezrat1 Jul 18, 2008


    I pulled the hose off the throttle body and sprayed several 3-second bursts down the IAC hole. I had to use a piece of aquarium tubing to extend the spray tube to get down the hole. I let it soak about 30 minutes and reconnected the hose and started the engine. It was sluggish for the first few seconds and I then I drove it around the block and repeated the process. This took care of the problem and my idle is so smooth. I can now leave the air conditioner on without the idle problem showing up. It will drop to 600 rpm when at operating temperature but remains smooth and steady. Thanks for the tip it did the trick.

  • dezrat1 Jul 18, 2008

    It was throttle body cleaner I sprayed in the IAC.

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1 Answer

Clean the IAC. Disconnect throttle body air hose and you will see a hole on the bottom of the throttle body just before the butterfly valve. Spray throttle body cleaner down the IAC hole and then let it soak about 1/2 hour. Reconnect hose and run engine about a minute and then repeat this process 2 or more times. Toyota engines from 1997-2005 commonly have the IAC get cruded up with carbon as early as 35,000 miles. This is a sImple and cheap repair that many repair shops don't want you to know.

Posted on Jul 11, 2008

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