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Hammer Time
Hammer Time, L1 Master Technician
Category: Car
Satisfied Customers: 4942
Experience:  ASE Mastertech with Adv level Engine performance cert.
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1999 Lexus: 300...000 miles..The engine idle speed becomes

Customer Question

I have a 1999 Lexus RX 300. Recently I did 90,000 miles maintence. The engine idle speed becomes low below 5000 rpm. The trouble is if I push the pedal to raise the engine idle speed, the engine will be off. After that, the engine will be very difficult to start. (I believe it is because of gasoline flood). But if I gear it to "D" and drive, everything becomes normal. I don't want to take this kind of chance. Do you know what reason causes the idle speed so low? Thank you.
Submitted: 11 years ago.
Category: Car
Expert:  Hammer Time replied 11 years ago.
It sounds like you could have a piece of carbon caught in the EGR valve and holding it open at idle. If you feel confident enough to remove it and inspect to see if it's closing all the way, go ahead. Otherwise I would get it into a shop to be checked. There are many other possibilities that get much more technical.
Customer: replied 11 years ago.
Reply to Hammer Time's Post: I talked to my technician. He has maintained my car for years and is considered a reliable guy. According to what he siad, if EGR is not closed, the car should be rough. But my car is quite and smooth. What do you think? Thanks,
Expert:  Hammer Time replied 11 years ago.

If you say you idle is smooth, then I don't understand your question al all. Aren't you having an idle problem with the car chugging to a stall?


Please clarify exactly what the car is doing.

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