Uncontrolled sudden acceleration in 2001 530

Bimmerbum

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#1
[V]

I have been a very happy owner of a superb 530i for the last 5 years. Absolutely trouble free, no accidents and overall, a joyful experience. This situation changed in seconds last weekend morning as I was backing out of my garage. About half way down the driveway (about 80 feet long in total), the car paused a little and then shockingly revved to an incredible level (with an attendant screech from the engine), bolted down the driveway, cut across the street, jumped curve, and proceeded to land and skid down a heavily wooded garden, with a sideview mirrow and parts of the front bumper flying off as they collided with rocks and trees. This all happened in a couple of seconds and I braked hard as I understood that I was in a serious trouble. The car did come to a stop, jammed between the trees. I couldn't even open the door. I was dazed and stunned, but otherwise unhurt, although I missed a direct collision with the trunk of a monster hemlock by millimeters. As soon as I regained my composure I try to drive the car out of the wood but it was stuck amongst broken and crushed tree branches. I climbed out of the window and saw that my pristine bimmer was dented and scratched extensively on every sides, a rear wheel sadly askew. I was very unnerved by this event, but was grateful that no one was on the street and I walked away unharmed. After getting the car towed out (the drivers of the tow truck and my neighbors were amused and amazed at what had happened), and having my wits back I talked to my friends and we all searched on the web to see if this type of potentially deadly malfunction was ever documented (since it was Saturday afternoon and all BMW contacts were closed). We were surprised to learn that from a court proceeding in 2004 (BMW was not found at fault) a BMW enginner did admit that they do get complaints about sudden unprecedented acceleration, but that most (BUT NOT ALL!) are due to driver errors. Now in my case there was absolutely no way that I could make an error going backward at less than 5mph, a motion that I had performed nearly everyday for last 6 years! On Monday following I called BMW custumer relation. The operator was sympathetic and understanding but no real help. He said a service rep will come out and check out the car but the appt must be made through a dealer. I called the local dealer who responded to my plight with hostility, stating that such thing never happens, clearly implying that it was my faulty driving that caused the accident. After much denial the service guy told me that I have to tow my car in and then they would examine the computer record at my own expense. This seemed like an invitation to an useless exercise in denial. Next day an issurance assessment was made and the car was towed to a bodyshop that works a lot on german luxury cars. The autobody manager proposed that he would contact a BMW service rep and have the inspection done at the shop and he would also get in touch with BMW dealers to see if there was a "silent" recall for similar problems.

I am waiting to see what will happen, but I am not expecting much. Has anyone experienced a similar problem? I noticed that there was a thread with faulty acceleration in 2004 5 series, but no followup. Any advise on how I should proceed with this problem? Although my insurance will cover the repair cost, my insurance will jump significantly, and more importantly I can no longer feel safe and confident driving this once impeccable car.

This is a cautionary tale and although this type of problem may occur only in one in a thousand or hundreds of thousand cars, its a potentially deadly problem that in principle should not occur at all.
Doc K
 

epj3

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#2
I've heard of sticky throttle cables but NEVER having it randomly accelerate. You sure you didn't accidently stop on the gas? Also, do the 2k1 530's have drive-by-wire? If so then I could easily see that being at fault, but otherwise it's impossible for a regular throttle to randomly open up.
 
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#3
Hi James,

This is really a very shocking story. I do feel for you as you obviously love your motor. My mum's car (E46 325i manual) had similar problems to yours but was nowhere near as violent. The 530i does indeed have a fly-by-wire throttle setup. Shame.

The first occurrence was this (I wrote this in a thread ages ago): "We've got an E46 325i manual and we've been arguing with the dealership over the effectiveness of the fly-by-wire accelerator.

Our car is very difficult to drive in traffic: the clutch is snatchy and the acceleration can sometimes come in lumps of power as opposed to a linear delivery. We had the dealership install new software for the fly-by-wire system which was fine for about a week and then the car reverted to its old self."

Then we had this problem about a month later: "My mum's 2002 E46 325i manual has been a bit temperamental of late. Had new accelerator softaware installed at BMW Melbourne after acceleration had massive hesitation issues. This was okay for a few days before the car reverted back to its naughty ways.

My dad and I took it back to BMW and told them to fix it. They said the car was absolutely fine. The old man cracked the sads but they refused to budge. I think it has a lot to do with the CDV fitted to our car which, coupled with the fly by wire technology, makes the car terribly hard to drive smoothly.

Then yesterday I get in and start the car and the engine is revving wildly between 500 and 2,000 RPM. Application of the throttle has absolutely no effect whatsoever on the engine revs. After about 30 seconds of this behaviour the engine cuts out."

It turns out that this was the cause of the second problem: "OK just got the car back from BMW. Turns out that the wiring loom which relays the accelerator's position to the ECU was shorted! Can you believe that? This is why prodding the accelerator made not one shred of difference. The whole dash was removed and a new loom was installed under warranty, thank God."

So I'm not sure if this info helps you at all but you obviously have to have someone check the car over. If there is a serious fault like the one we had with the wiring loom then you can take BMW to the cleaners if they refuse to fix the problem. I think it has to be something of this nature and with the fly-by-wire throttle setup on your car it is perfectly clear to me that it is the culprit. Sometimes the software itself has to be upgraded in order to remedy the hesitation issues (like we had in the first instance).

Our E46 is still a bitch to drive. At times the acceleration is in huge lumps of unlinear power. It's totally unacceptable but what can you do? The car is a gem and it's only the fly-by-wire and CDV which draw it back. I hope this info helps you in some way. Good luck.
 
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#4
Sorry to hear this happened. I'm curious to know the result of your inspection. I've never heard of anything like that happening with an E39. Good luck.


I had something like that happen to me once in my GMC pickup truck but stopped it before hitting anything. It was my fault though. I was wearing a wide shoe that hit the edge of the gas pedal when I was braking while backing out of the driveway, causing a sudden backwards acceleration. I don't wear those shoes anymore.


[driving2]
 

Bimmerbum

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#5
I wasn't pressing any pedals while backing out of the driveeway when the car became possessed so its not possible that I pressed the throttle to the floor by mistake.

An auto engineer at the trial that I referred to did say that electronic faults or malfunction can sometimes lead to sudden acceleration. On top of this a BMW enginner also confessed that they do get complaints about sudden acceleration every year, although he did clarify somewhat that most (but not all) of these incidents do not arise from mechanical defects.

I tried to post a picture but the file seems to large. Oh well.
 
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#6
i'm shocked to hear this, but i'm glad no one was seriously hurt.

i'm now kind of scared of this happening to me and other BMW drivers and hopefully after your car gets a review you can find out what the problem was and we can all watch out for it.
 

Big Daddy

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#7
there was a cruise control cable recall on my 97 Z3 that I was never notified of. It failed while my daughter was driving the car and was the primary cause of the accident she was involved in. We hired an attorney and the rest is history (Confidentially agrement) And yes the cable can cause the car to accelerate, I am not an engineer but he explained it in the accident reconstruction.

I assume this is not the same for your car, but it may be worth looking into.
 

epj3

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#8
Big Daddy said:
there was a cruise control cable recall on my 97 Z3 that I was never notified of. It failed while my daughter was driving the car and was the primary cause of the accident she was involved in. We hired an attorney and the rest is history (Confidentially agrement) And yes the cable can cause the car to accelerate, I am not an engineer but he explained it in the accident reconstruction.

I assume this is not the same for your car, but it may be worth looking into.
Cruise control yes, but a regular throttle cable from a gas pedal, if not pushed down at all (closed throttle) it is impossible for the throttle to just open (unless of course the cruise control went mad and decided to turn on randomly, which I can honestly see happening with a BMW).
 

cdallmon

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#9
James, I own a 2002 530i and my wife mentioned that she had two occasions in the last month when she was stopped and pushed very hard on the brake and the car's engine rpm increased. I will try to duplicate the actions and see if I can get the same results. I had an 82 Cadillac and every time you tapped the brake to disengage the cruise above 45 mph the engine would die at 25 mph if you did not touch the throttle again. Of course the engine usually died in a corner.
 


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