MDuser Posted January 20, 2004 Share Posted January 20, 2004 In cold weather, my 97 Lexus ES 300 will idle rough after traveling about 30 mph and then coming to a complete stop. The car will pulsate for a few seconds and then return to a normal idle. This only happens in real cold weather (28 degrees) and only during the first complete stop. The car starts fine, idles regular, and I also allow ten minutes for the car to warm up before driving. Does anyone know what could be causing this problem? Any assistance is greatly appreciated b4 I take the car to the dealer. Thanks. Quote Link to comment Share on other sites More sharing options...
steviej Posted January 21, 2004 Share Posted January 21, 2004 could be lots of things, all associated to fuel air mixture and delivery: -dirty idle air control assembly (prone to carbon build up), -dirty throttle body or lazy trottle position sensor -lazy O2 sensor sending wrong info ECU, takes a second or two for the ECU to catch up to the fuel air mixture difference at stop. -could be a faulty crank or cam sensor -lazy MAF sensor -fuel pressure sensor no CEL, right? the only true way to diagnose what is going on is to have a scan tool hooked up to the car at the time it actually pulsates. This way you/a trained mechanic can actually pinpoint what is happening and what may be causing the pulsation. steviej Quote Link to comment Share on other sites More sharing options...
SKperformance Posted January 21, 2004 Share Posted January 21, 2004 i agree totally with steviej check the idle control and clean it first extremly common problem with about 20 posts on the subject Quote Link to comment Share on other sites More sharing options...
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