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Author Topic: intermittent Braking/engine surging going down hills  (Read 289 times)

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May 09, 2018, 12:59:00 PM

couchiedemon

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intermittent Braking/engine surging going down hills
« on: May 09, 2018, 12:59:00 PM »
Quite often, when doing down a steep hill, having taken my foot off the accelerator, the brakes will be applied and the engine will rev to approx 4000 RPM. Someone has said that this is a "feature" akin to pre-emptive braking but to me it seems like problem as it doesn't happen all the time and does not seem to be related to the traction control (in that no traction control light comes on when this happens. Blipping the throttle seems to cure it - as the braking effect ceases and the revs return to normal. Any ideas? Car is a 2002 3.0i with 76k miles on the clock.
2002 E53 3.0i, 2005 Mini Cooper S Conv,  Honda NC750X

May 09, 2018, 08:36:12 PM
Reply #1

Murphybarnes

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Re: intermittent Braking/engine surging going down hills
« Reply #1 on: May 09, 2018, 08:36:12 PM »
Forgive my ignorance but I wasn't aware that E53 had traction control. Never once felt the brakes being independantly applied.
I do get the rev surge when going down a decent hill though.
Engine braking I presumed.
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May 09, 2018, 09:53:42 PM
Reply #2

Horizon

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Re: intermittent Braking/engine surging going down hills
« Reply #2 on: May 09, 2018, 09:53:42 PM »
It's normal for the E53 to do this is is engine braking. The gearbox / DSC system monitors down hill conditions and if you need to press the brake to hold the desired speed it changes down and hold the desired speed under engine braking as you would in a manual to save cooking the brakes.
And yes DSC is traction control.
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June 02, 2018, 11:05:04 AM
Reply #3

Richyroos

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Re: intermittent Braking/engine surging going down hills
« Reply #3 on: June 02, 2018, 11:05:04 AM »
Ditto the above! The amount of engine braking depends on how hard you step on the brakes, so it will vary each time, a heavy braking application will drop the gearbox down two gears instead of the usual one. Applying the accelerator changes back up again.
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Current car : 2004 E53 X5 3.0D