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#1
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Lurch problem 4.6iS (video)
When braking to a standstill, the car's revs drop to zero and bounce back up, causing the car to briefly lurch/jerk forward. What could be causing this? (video is not the best quality sorry) https://youtu.be/_OQn_XcboJw (00:04 - 00:05 seconds is the point where it drops and bounces up) When braking, if I put the car in neutral when coming to a stop it doesn't do this.
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Metallic Saphire Black 2002 e53 X5 4.6iS Last edited by Sokm; 09-17-2015 at 07:00 PM. |
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#2
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It's hard to tell in the video, but I think I might be having the same issue with my '05 4.8is, only it has gotten worse.
I feel that it's more of a surge at this point. If I roll up to a light and it starts doing it, it wants to surge forward, almost like it's a manual and I've almost come to a stop in 2nd gear with my foot off the clutch and it's about to die. If I quick drop it into Neutral the kicking goes away. Keep me posted. I'm having my shop take another look on Monday. About a month ago we thought we had it fixed, they had noticed a vacuum abnormality, replaced a torn PCV diaphragm and it didn't seem to do it anymore. But it has gradually made its way back in.
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#3
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Check or replace 02 sensor
Does your car hesitates when starting? |
#4
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Quote:
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Metallic Saphire Black 2002 e53 X5 4.6iS |
#5
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Quote:
Could be something to do with one of my catalytic converters...
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Metallic Saphire Black 2002 e53 X5 4.6iS |
#6
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The shop didn't get to it on mine yesterday - I had given them quite the laundry list. Should hear more today.
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#7
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I have almost the same issue, not so much lurching forward, but instead when im coming to a stop, my rpms will drop to pretty much 200 rpm and the car feels like its going to cut out and die but recovers and the rpms go back up to around 600-700.
with the A/C on, the problem is not there.. Any updates? 2004 4.4 |
#8
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My O2 sensors all tested out fine, but I don't think they took them out and looked at them, they just took readings from Auto Logic.
And of course now we can't even get it to do the surging behavior, so we wait.
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#9
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I was advised that the Lurch issue has been resolved before by fitting a new valve body (expensive!!). Makes sense if you think about... but obviously this is the last/worst case scenario.
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Metallic Saphire Black 2002 e53 X5 4.6iS |
#10
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Quote:
I would like to avoid replacing the valve body...but it sure does make sense.
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