Question about 1999 Toyota Camry
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.
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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Posted on Jan 02, 2017
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