High RPM at cold start
03-27-03, 07:35 AM
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High RPM at cold start
1993 LS 400 85,000 mi. At cold start engine races to what sounds like full throttle for about 10 seconds. Extremly loud roar, then it quiets down to what seems like a normal cold idle speed. We do not touch the acclerator pedal, just turn the key to start.
Is this 10 second high RPM very loud roar normal ? Thanks for any comments. - Herm
Is this 10 second high RPM very loud roar normal ? Thanks for any comments. - Herm
03-27-03, 08:22 AM
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Re: High RPM at cold start
Originally posted by Herm
1993 LS 400 85,000 mi. At cold start engine races to what sounds like full throttle for about 10 seconds. Extremly loud roar, then it quiets down to what seems like a normal cold idle speed. We do not touch the acclerator pedal, just turn the key to start.
Is this 10 second high RPM very loud roar normal ? Thanks for any comments. - Herm
1993 LS 400 85,000 mi. At cold start engine races to what sounds like full throttle for about 10 seconds. Extremly loud roar, then it quiets down to what seems like a normal cold idle speed. We do not touch the acclerator pedal, just turn the key to start.
Is this 10 second high RPM very loud roar normal ? Thanks for any comments. - Herm
Last edited by BananaGS; 03-27-03 at 08:23 AM.
03-27-03, 08:36 AM
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Just acquired the car so I don't know if this is new. It is not an exhaust leak, as I said, it is racing to near full throttle RPM's for about 10 seconds on cold start. Much faster/louder than cold start on other cars I have owned. Any first gen LS owners out there who could describe how high their vehicle revs on cold start and for how long ? Thanks - Herm
Last edited by Herm; 03-27-03 at 08:38 AM.
03-27-03, 09:43 AM
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mooretorque - thanks for the fedback- can you expand on "not normal" ? Does anyone know the cold start sequence, correct RPM, etc. ?
As far as the advice for a service dept visit is concerned, that is a last resort for me, I prefer to do all my own work, so far have done pretty well . Lexus is new to me though so I am looking for info and learning. Thanks - Herm
As far as the advice for a service dept visit is concerned, that is a last resort for me, I prefer to do all my own work, so far have done pretty well . Lexus is new to me though so I am looking for info and learning. Thanks - Herm
03-27-03, 03:09 PM
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Herm, you mean full throttle, like 2000-5000 rpm for 10 seconds? Please give us more details or numbers. It could be the Idle air control valve( very rare), throttle plate sticking or you may heard the noise from the power steering pump that low on fluid?
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