View Poll Results: Engine Stalls when Sudden Braking
2009
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gx470
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Engine try to stall when sudden Brake applied and accelerated.
Thread Starter
Driver School Candidate
Joined: Aug 2018
Posts: 3
Likes: 0
From: California
Engine try to stall when sudden Brake applied and accelerated.
2009 Lexus GX470 - 1,05000 miles - Engine try to stall when sudden Braking applied, and as soon as the engine is accelerated I feel a Big Knock, it doesn't happen on a normal Braking situation, only on the freeway,. serviced transmission system No help.
problem started around 70,000 miles, now it is getting worse. dealer was unable to duplicate the problem.
problem started around 70,000 miles, now it is getting worse. dealer was unable to duplicate the problem.
Lead Lap
Joined: Feb 2014
Posts: 3,651
Likes: 816
From: NC
Unlikely that it's the brake booster - it's electrically driven not a vacuum assist. So it should have negligible affect on the engine.
I would look at things like a stuck caliper, bad ABS sensor, bad ABS valve or pump.
Chip H.
I would look at things like a stuck caliper, bad ABS sensor, bad ABS valve or pump.
Chip H.
Lead Lap
Joined: Mar 2019
Posts: 556
Likes: 222
From: Louisiana
Like what was said.. this vehicle doesn’t use a traditional vacuum booster... so you would get a massive vacuum loss on heavy stops.
Id lean more towards motor mounts causing a larger vacuum line to separate when you brake or accelerate abruptly.. due to the engine tilting forward or backwards.
This is easy to test... just pop the hood and let someone look at how far the engine tilts when you power brake in drive or reverse.. just be sure to do this in a safe open area, with the person watching standing next to the engine bay and not in front of it.
Id lean more towards motor mounts causing a larger vacuum line to separate when you brake or accelerate abruptly.. due to the engine tilting forward or backwards.
This is easy to test... just pop the hood and let someone look at how far the engine tilts when you power brake in drive or reverse.. just be sure to do this in a safe open area, with the person watching standing next to the engine bay and not in front of it.
Last edited by MrJason; Jul 15, 2019 at 04:36 PM.
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