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

Car lunging forward when letting off the brake

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Old 11-10-10, 01:52 PM
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Max Power
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Default Car lunging forward when letting off the brake

First off, I would like to apologize for all the threads lately. I feel like I'm getting annoying, but I am just in diagnostic mode and trying to figure out all the car problems right. Very focused.

Anyway, this is a problem I experience moreso when the motor is cold. The engine seems to rev higher. When I get to red lights, I apply the brake and come to a complete stop, but at the same time I can feel the car is still trying to go forward. When I do let go of the brake pedal, the car moves forward on it's own at a decent pace. Once the car warms up properly, I can let go of the brake and the car stays there until I hit the gas pretty much.

Would anyone have any idea or anyone experience this at all?

I am working hard on eliminating reasons for my code 71, so any info helps.
Old 11-11-10, 04:31 AM
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steve2006
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It sounds normal to me,mine does exactly the same when the engine is cold and the idle speed is higher,when fully warmed the idle speed is 650 RPM and the car will not move when the brake is released until given some gas pedal.
I don't know if it applies to the later models (mine is a 1994) but until the transmission has warmed up it will not shift into 4th/overdrive,again this is normal for these transmissions.
Old 11-11-10, 05:03 AM
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LiCelsior
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whats ur idle rpms at when warmed up?
Old 11-11-10, 05:52 AM
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Max Power
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Originally Posted by LiCelsior
whats ur idle rpms at when warmed up?
There's a problem I should have mentioned...My tach doesn't work. The needle is well below the 0 and rarely moves unless I REALLY step on it.

It's like it's resting at -3000rpm instead of 0....
Old 11-11-10, 09:47 AM
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Lexozz
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Originally Posted by Max Power
Anyway, this is a problem I experience moreso when the motor is cold. The engine seems to rev higher. When I get to red lights, I apply the brake and come to a complete stop, but at the same time I can feel the car is still trying to go forward. When I do let go of the brake pedal, the car moves forward on it's own at a decent pace. Once the car warms up properly, I can let go of the brake and the car stays there until I hit the gas pretty much.

Would anyone have any idea or anyone experience this at all?

I am working hard on eliminating reasons for my code 71, so any info helps.
When the engine is cold its normal for it to rev higher until it warms up and then idles at around 500-700 rpm.
Old 11-11-10, 10:21 AM
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LiCelsior
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but not to the extent of what hes explaining.
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