LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Idle with A/C on is 650rpm, A/C off 500rpm

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Old 11-10-08, 02:09 AM
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qha_vn
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Default Idle with A/C on is 650rpm, A/C off 500rpm

when A/C is on, idle is very steady and smooth (650-700 rpm) but when A/C goes off, idle is too low (450-500 rpm or even less)

how to fix?

thanks
Old 11-10-08, 04:57 AM
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tbilisi79
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Clean the throttle body!
Old 11-10-08, 05:33 PM
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qha_vn
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Originally Posted by tbilisi79
Clean the throttle body!
yes, i did. same issue
Old 11-10-08, 05:42 PM
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LiCelsior
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isnt that suppose to normal?
Old 11-10-08, 11:20 PM
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Celsior400
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i thought it was normal too... wtf?
Old 11-11-08, 03:17 AM
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qha_vn
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i think idle should be same same around 650 rpm for all load conditions
Old 11-11-08, 09:41 AM
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lexie
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mine is between 450-500rpm too when idle.
Old 11-11-08, 08:35 PM
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qha_vn
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Originally Posted by lexie
mine is between 450-500rpm too when idle.
with A/C on or not?
Old 11-12-08, 12:04 AM
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lexie
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600 - 700 rpm when ac is on.
Old 11-15-08, 07:31 PM
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qha_vn
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if you guys have no shaking at 450 rpm, i have to replace engine/ tranny mounts, havent i?
Old 11-17-08, 12:23 PM
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pax217
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....that's normal for the RPMs to be higher at low/no speeds with the A/C on. It's why they say "using the A/C wastes gas." It only wastes gas if you're sitting in traffic. If you're in 2nd gear + it won't make a difference.

...then again, we've all got V8s... who cares about gas.
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