Error code 4B99 and 483D

blue dragon · Mar 7, 2014

So I have a new random behaviour. On full throttle, the car will lower power, I coast to a stop and then the engine shuts off and the transmission shifts to neutral. I have to shut the car down, and then restart it, and it restarts fine. The smallest attempt to dip into the throttle then results in a CEL and the behaviour repeats. INPA shows these two codes.

483D is throttle actuator, but I have no clue what 4B99 is for. If I clear the codes, the car works fine until the next random time the behaviour repeats itself. Off to the dealer she goes.

smyles · Mar 7, 2014

When you turn off the engine, does the car shudder a bit?

Marti Mouse · Aug 7, 2020

Mine just did this - if you***8217;re still here, what is it??? Shudders on shut down.

blue dragon · Mar 7, 2014

No, it doesn't

Here is the behaviour after the CEL has been triggered, the slightest application of throttle results in losing power, coasting to a stop, and then the engine dying, transmission shifting to neutral

www.youtube.com/watch?v=A0CVsy4ZhWA&HD=1

smyles · Mar 8, 2014

My guess - injector. Do the selective mass adjustment check in inpa. Wouldn't be surprised if it's #6.

blue dragon · Mar 8, 2014

Thanks. I will do the test and see.

smyles · Mar 8, 2014

Also, check the condition of plastic partitions at the back of the engine bay. If cracked/split, they leak water from rain, etc. into the bay and right on that injector.

ard · Mar 18, 2014

Impressive.

:bow:

blue dragon · Mar 11, 2014

^^ That is the exact issue, number 5 and 6 injectors getting shorted out because of the back plastic partitions leaking.

finnbmw · Mar 11, 2014

blue dragon said:
^^ That is the exact issue, number 5 and 6 injectors getting shorted out because of the back plastic partitions leaking.

Would you mind taking a picture of the affected area, so we can check on ours for any leaks. Thanks!

smyles · Mar 11, 2014

It's these things, especially the middle one.

serge1 · Mar 11, 2014

So that cover does not protect them whatsoever?

blue dragon · Mar 11, 2014

Its supposed to, but it doesn't if it leaks. BMW has issued a SIB pertaining to it. X5 finally threw 445C which is a short in injector number 5, dealership had no diesel injectors in stock, so I am guessing its not as common as 35i injector replacement

Snolls · Mar 11, 2014

blue dragon said:
Its supposed to, but it doesn't if it leaks. BMW has issued a SIB pertaining to it.

A bulletin about the plastic partitions? Do you have a link or #?

(All three of mine are split horizontally across the middle. No issues yet, but I should probably take preventative measures.)

smyles · Mar 11, 2014

BMW now supplies an updated middle part, with longer rubber flaps. Not sure how much better it is, but bottom line if it's cracked, better have it replaced.

lpcapital · Mar 11, 2014

Interesting topic.

I am a bit skeptical of the theory that water dripping from the partition causes the injectors to short out. Here's some pictorial aid...

You have the pretty looking cover:

Below that you have the air filter box:

Then below the air filter box you have the insulation with a plastic cover on the back:

Then you get to the intake with the injectors:

And the injectors have water tight connectors (of which I don't have picture)...

The point being that if water shorts the injectors is the injectors or the plugs that are defective, not some cracked cover, and it still seems to me a great deal of twisting and turning that water has to do to get there...

Nonetheless I would be curious to see the SIB people talk about since mine is cracked too

blue dragon · Mar 11, 2014

I was skeptical as well, but that's the story I got. I'll grab the SIB number next time I talk to the advisor. I really hate going to BMW for stuff I am capable of fixing myself. It was 9 c here today, I was tempted to pull the airbox and intake manifold to have a look. Thanks for the pictures, they saved me from having to do it.

It looks like its just the fuel line and electrical connector going to the the injector

Morristown BMW has the part for $355.15 plus a $50 core charge, so depending on the quote from the dealer (and the temperature outside), I might just do it myself.

lpcapital · Mar 11, 2014

The SIB you're referring to should be 51-34-11. I'd love to see what it says

Be sure you have all your ducks in a row. Injectors on direct injection often get stuck and sieze in the head. You'll need at a minimum a sliding hammer to get them out, but sometimes you're not that lucky.

How stubborn can they be? This much:

http://youtu.be/XwZOTf8vYhE

Snolls · Mar 12, 2014

lpcapital said:
The SIB you're referring to should be 51-34-11.

It looks like that one applies to the 2012? (Can't find it relating to mine, 2007.)

Whatever. Ordered the replacement parts. It doesn't seem like it should be a bad job. (Famous last words?)

blue dragon · Mar 11, 2014

Yes, I saw the special tool needed to pull the injector, but that video is funny!

smyles · Mar 11, 2014

Water trickles down the right bolt that holds the plastic portion of the insulation and right on the injectors. A good indication is the bolt being rusty, sometimes completely obliterated.

Trust me, water (and any other liquid), has penetration capabilities beyond imagination. In one of my prior bimmers oil from the leaking engine sensor managed to travel thru wiring all the way into ECU, shorting it for good.

smyles · Mar 12, 2014

Keep in mind new injector has to be programmed, and I'm not sure it can be done with the usual coding tools. Rheingold - may be, haven't explored it beyond basic diagnostics yet.

lpcapital · Mar 12, 2014

As far as the "proper" procedure, once the retaining bolts are removed, they should come out. The problem is that sometime there is corrosion buildup and they get stuck or seize... In which case you need at a minimum a sliding hammer, but it can be a royal PITA to get them out.

I think I remember seeing something about calibration injectors in the DIS under Function Selection. I think blue dragon has access to it...

Btw, if anyone finds the SIB it would be great if he could share it

lpcapital · Mar 13, 2014

I checked our 2009 35d last night and all 3 sections are cracked.

I'd be very curious to know if the new part is actually any different and I'm still looking for the SIB if anyone has access to it

Sent from BimmerApp mobile app

RPsX5d · May 1, 2014

Just wanted to be sure I am looking at the right part to see if mine is cracked.

Are the partitions referred to in this thread the same ones I have marked as 1, 2 and 3 in the attached photo?

Thanks.

blue dragon · Mar 17, 2014

So BMW is covering this. I had the tech show me the injector and the mini slide hammer that you use to get out the injector. You can clearly see where the water effects on injector number 5. The injector itself was corroded. The SIB calls for sealing the joints of the plastic cowling with some kind of black sealant as well. The cowling edges where they come together act as a drip edge, and the water just follows that route.

serge1 · Mar 17, 2014

Thank you, blue_dragon!
It rains 9 months in a year here in Seattle. I better take a good look there..

Aufgeblassen · Jul 12, 2016

It all depends on what is below the gasket. If nothing that is unsealed, then no consequence.

blue dragon · Mar 19, 2014

And she's bach home, diagnosis attached

lpcapital · Mar 19, 2014

Thanks for sharing!!!

The SIB 13 01 12 is about fuel injector faults: I'd be curious to see it and if it mentions anywhere the partitions.

Could you take a look at the partition they replaced and see if it is any different than the one that was there before? I'd take a look at mine and see if it has the same part number stamped. I'm trying to figure out if at some point it was upgraded or redesigned: all 3 sections of mine are broken...

blue dragon · Mar 19, 2014

I don't think that it looks any different. I had already replaced them once when I installed my radar detector in 2011 and noticed they were cracked, so it could be that I had gotten the updated part then. The only difference with the cowlings is that there is now black butyl sealant at the seams

lpcapital · Mar 22, 2014

The issue with injector #5

Today I decided to take the partitions apart and replace it.

Here's how they looked: all 3 were broken along the seam

I called the parts department at my local dealer and the conversation went something like this (I have a very good relationship with the parts department and have been doing business with them for quite a few years):
Me: "Hello it's me. I need part number A, B and C"
Her: "Are those the partition in the X5?"
Me: "Yes they are, great guess"
Her: "Oh we stock them because they break all the time"
Me: "I'm not surprised. If you could, would you be so kind to check with your techs if there's any sort of SIB on point?"
Her: "Sure, I'll call you back"
15 minutes later
Her: "No, their is isn't they just replace them"

So there it is: very common issue, but no SIB

In the meantime I decided to take it apart and discovered why this issue ends up causing issue with injector #5.

Although above the engine there is a bunch of stuff it all sits in front of the black plastic cowl you see in the back on the engine so it really doesn't add any protection. Moreover there is a sound proofing foam right over the engine that is exposed between the cowl and the airbox and it can easily act like a sponge. It is contoured so it is in contact with whatever is underneath. Last but not least there is a valley in the contour where water accumulates.

And guess what is right under that valley? Yes, injector #5!!! In my case I discovered corrosion on the fuel line of injector #5 going from the fuel rail to the injector pump. Right below the fuel line is where the connector is.

What I decided to do is remove the foam: it is technically a sound proofing foam, but I honestly didn't notice any change in noise. This way water should flow if it ever gets there.

Now lets go back to the partition. It is such a royal piece of $hit that I went pick up a new one that was already cracked so I had to return it. But it appears that someone has noticed the flaw: the center piece is not made of compressed vomit but plastic and is much more robust: it still retained the same part number. Also noticeable is the different gasket profile.

Tomorrow I'll go back pick up the new side that was broken but I'll ask to investigate if maybe that is some old inventory... Stay tuned!!!

Thirdy · Mar 22, 2014

lpcapital said:
Today I decided to take the partitions apart and replace it.

Here's how they looked: all 3 were broken along the seam

lpcapital, are those 2 big ones on the side suppose to be connected to that long plastic running across? Are they suppose to be one piece except for that middle part?

ard · Mar 22, 2014

We should start reporting this to NHTSA as a potential safety event ("Loss of power leading to loss of control")... 10-20 reports and BMW is facing an investigation.

lpcapital · Mar 22, 2014

Well the loss of power is one thing, but a corroded fuel line delivering diesel at 25,000 psi is a receipt for unplesent things to happen.

I think what would help is to assemble pictures of several cars that exhibit similar things... But I'm not familiar at all with those kind of investigatinos

blue dragon · Mar 22, 2014

And this pops up again to bite someone else in the ass

http://www.xoutpost.com/bmw-sav-forums/x5-e70-forum/96435-sell-time-opinion.html

Thirdy · Mar 22, 2014

Then I might have the dealership replace mine. The last time I checked it those 2 big sides are separated from that long part running across.

lpcapital · Mar 22, 2014

Yep. It's stupid easy to replace them. If you buy them make sure you get the newer design center piece (see picture below). I'll let you know of the new part I get Monday is any different.

Sent from BimmerApp mobile app

Snolls · Mar 27, 2014

Here's my contribution to the cracked partition issue:

The main difference I see between the old versions and the new versions is the "seal".

The old center piece had a piece of foam "weatherstripping" (which I taped on just for purposes of the picture). The new one has rubber weather stripping molded onto it, plus some "wings" extending off the sides.

The old side pieces had no weatherstripping at all. The new ones have foam.

Error code 4B99 and 483D

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