2000 Lexus ES 300 Low RPM's at cold start

Tiny
KBIZZARRO
  • MEMBER
  • 2000 LEXUS ES 300
Engine Mechanical problem
2000 Lexus ES 300 6 cyl Front Wheel Drive Automatic 80.000 miles

I have been having trouble keeping my car running recently at initial cold starting. Initial RPM's aren't high enough to keep the motor running without hitting the gas to increase engine speed. Once it heats up a little, (about 30-45 seconds) the motor runs fine. I have a new air filter, I've cleaned the air intake butterflies. I've found no vacuum leaks. I've increased the set screw to increase idle RPM's a little, but the car still starts like it has an old style carburetorr that wouldn't close it's choke in cold weather. My initial computer scan came up with a P505 idle air/ speed control problem. I also noticed the throttle cable had a little slack in it, so I adjusted that. Can you suggest something else for me to check?
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Monday, October 6th, 2008 AT 8:49 AM

2 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
Clean the idle air control valve and housing, if problem persists replace the IAC.

You should not adjust the idle screw, this is simply masking the problem and may cause the engine to run lean/rich once the real problem is fixed.
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Monday, October 6th, 2008 AT 1:09 PM
Tiny
KBIZZARRO
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I did as you suggested and cleaned the IAC which fixed the problem. Since I had previously increased the idle speed before cleaning, it was necessary to bring it back down to it's original position. Thank you.
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Wednesday, October 8th, 2008 AT 8:44 AM

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