UTC San Diego Posted November 1, 2004 Share Posted November 1, 2004 I heard buzz noise like "zzzzzzz" from front when I step on gas pedal to go from stop. Mine is 91 LS400 w/ very high mileage. What could it be? I appreciate any comment or advise. Thanks! Quote Link to comment Share on other sites More sharing options...
Em91 Posted November 1, 2004 Share Posted November 1, 2004 It could be a heat shield but, is a metallic noise or something else? Quote Link to comment Share on other sites More sharing options...
UTC San Diego Posted November 1, 2004 Author Share Posted November 1, 2004 It may be a small metalic kindda noise. The noise itself is not that loud. My Lexus was fairly quiet before this, and I noticed this noise when I idle or start the car in last few days. My area was raining hard for last few weeks and I just wonder if that has something to do with it. Maybe not. Quote Link to comment Share on other sites More sharing options...
Em91 Posted November 1, 2004 Share Posted November 1, 2004 You need to find out which side the noise is coming from. More than likely it is a heat shield. Quote Link to comment Share on other sites More sharing options...
flanker271 Posted November 1, 2004 Share Posted November 1, 2004 I think I know what you are talking about. Do you feel gas pedal vibrate while the noise is on? On mine the noise comes from the bottom of the shifter knob. I haven't got the faintest idea what the cause is. Quote Link to comment Share on other sites More sharing options...
UTC San Diego Posted November 2, 2004 Author Share Posted November 2, 2004 Actually there're no vibration. Just metal kindda squeaky noise like "zzzzzzzzz". I think I heard the noise from passenger side. Thank you for your comments. Quote Link to comment Share on other sites More sharing options...
92Lex Posted November 2, 2004 Share Posted November 2, 2004 Are you positive that it's not coming from the inside of the car? Quote Link to comment Share on other sites More sharing options...
UTC San Diego Posted November 2, 2004 Author Share Posted November 2, 2004 I just drove the car this evening and the sound came from front almost like from behind the main panel. Also, the engine idle sound not smooth now. RPM is stable but engine sounds like "Bbb...Bbb...Bbb...Bbb..." BTW, what if I don't replace the heat shield or air filter? What would happen to the car? Quote Link to comment Share on other sites More sharing options...
90LS400Lexus Posted November 2, 2004 Share Posted November 2, 2004 When you say "main panel"- do you mean the "firewall"? Also- just wondering- you said your car had "very high mileage". Just wondering as to what your exact mileage is.... I know that Blake and I had two of the higher mileage LS's here. Mine had 235K and his had around 238K last time I heard. Quote Link to comment Share on other sites More sharing options...
92Lex Posted November 2, 2004 Share Posted November 2, 2004 I just drove the car this evening and the sound came from front almost like from behind the main panel. Also, the engine idle sound not smooth now. RPM is stable but engine sounds like "Bbb...Bbb...Bbb...Bbb..." BTW, what if I don't replace the heat shield or air filter? What would happen to the car? ← Sounds kinda like a very small diesel engine? Quote Link to comment Share on other sites More sharing options...
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